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DESCRIPTION
The WM9711L is a highly integrated input / output device designed for mobile computing and communications. The device can connect directly to mono or stereo microphones, stereo headphones and a mono speaker, reducing total component count in the system. Additionally, phone input and output pins are provided for seamless integration with wireless communication devices. The WM9711L also offers five GPIO pins for interfacing to buttons or other digital devices. To monitor the battery voltage in portable systems, the WM9711L has two uncommitted comparator inputs. All device functions are accessed and controlled through a single AC-Link interface compliant with the AC'97 standard. Additionally, the WM9711L can generate interrupts to indicate low battery, dead battery, thermal cut-out and GPIO conditions. The WM9711L operates at supply voltages from 1.8 to 3.6 Volts. Each section of the chip can be powered down under software control to save power. The device is available in a small leadless 7x7mm QFN package, ideal for use in handheld portable systems.
WM9711L
Low Power Audio CODEC for Portable Applications
FEATURES
* AC'97 Rev 2.2 compatible stereo codec - DAC SNR 94dB, THD -87dB - ADC SNR 92dB, THD -87dB - Variable Rate Audio, supports all WinCE sample rates - Tone Control, Bass Boost and 3D Enhancement * On-chip 45mW headphone driver * On-chip 400mW mono speaker driver * Stereo, mono or differential microphone input - Automatic Level Control (ALC) * Auxiliary mono DAC (ring tone or DC level generation) * Seamless interface to wireless chipset * Up to 5 GPIO pins * 2 comparator inputs for battery monitoring * 1.8V to 3.6V supplies * 7x7mm QFN
APPLICATIONS
* Personal Digital Assistants (PDA) * Smartphones * Handheld and Tablet Computers
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Production Data, August 2006, Rev 4.3 Copyright (c)2004 Wolfson Microelectronics plc
WM9711L TABLE OF CONTENTS
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DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION...........................................................................................4 ORDERING INFORMATION ..................................................................................4 PIN DESCRIPTION ................................................................................................5 ABSOLUTE MAXIMUM RATINGS.........................................................................6 RECOMMENDED OPERATING CONDITIONS .....................................................6 ELECTRICAL CHARACTERISTICS ......................................................................7
AUDIO OUTPUTS.......................................................................................................... 7 AUDIO INPUTS.............................................................................................................. 8 AUXILIARY MONO DAC (AUXDAC).............................................................................. 8 COMPARATORS ........................................................................................................... 8 REFERENCE VOLTAGES ............................................................................................. 9 DIGITAL INTERFACE CHARACTERISTICS.................................................................. 9 HEADPHONE / SPEAKER OUTPUT THD VERSUS POWER ..................................... 10 POWER CONSUMPTION............................................................................................ 11
DEVICE DESCRIPTION.......................................................................................12
INTRODUCTION.......................................................................................................... 12 AUDIO PATHS OVERVIEW......................................................................................... 13
AUDIO INPUTS ....................................................................................................14
LINE INPUT ................................................................................................................. 14 MICROPHONE INPUT ................................................................................................. 14 PHONE INPUT............................................................................................................. 16 PCBEEP INPUT ........................................................................................................... 17
AUDIO ADC..........................................................................................................18
RECORD SELECTOR ................................................................................................. 19 RECORD GAIN............................................................................................................ 20 AUTOMATIC LEVEL CONTROL.................................................................................. 21
AUDIO DACS .......................................................................................................24
STEREO DAC.............................................................................................................. 24 AUXILIARY DAC.......................................................................................................... 27
ANALOGUE AUDIO OUTPUTS ...........................................................................28
HEADPHONE OUTPUTS - HPOUTL AND HPOUTR.................................................. 28 EAR SPEAKER OUTPUT - OUT3 ............................................................................... 29 LOUDSPEAKER OUTPUTS - LOUT2 AND ROUT2.................................................... 30 PHONE OUTPUT (MONOOUT)................................................................................... 31 THERMAL CUTOUT .................................................................................................... 31 JACK INSERTION AND AUTO-SWITCHING............................................................... 32 DIGITAL AUDIO (SPDIF) OUTPUT ............................................................................. 33 AUDIO MIXERS ........................................................................................................... 34
VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION ...............................36 BATTERY ALARM ...............................................................................................37
PRINCIPLE OF OPERATION ...................................................................................... 37
GPIO AND INTERRUPT CONTROL ....................................................................40 POWER MANAGEMENT .....................................................................................43
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WM9711L AC97 DATA AND CONTROL INTERFACE .........................................................46
INTERFACE PROTOCOL............................................................................................ 46 INTERFACE TIMING ................................................................................................... 47
REGISTER MAP...................................................................................................50
REGISTER BITS BY ADDRESS .................................................................................. 51
APPLICATIONS INFORMATION .........................................................................59
RECOMMENDED EXTERNAL COMPONENTS........................................................... 59 RECOMMENDED EXTERNAL COMPONENT VALUES .............................................. 60 LINE OUTPUT ............................................................................................................. 60 AC-COUPLED HEADPHONE OUTPUT....................................................................... 61 DC COUPLED (CAPLESS) HEADPHONE OUTPUT ................................................... 61 BTL SPEAKER OUTPUT ............................................................................................. 62 COMBINED HEADSET / BTL EAR SPEAKER............................................................. 62 COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER......................................... 62 JACK INSERT DETECTION ........................................................................................ 63 HOOKSWITCH DETECTION....................................................................................... 63
PACKAGE DRAWING..........................................................................................64 IMPORTANT NOTICE ..........................................................................................65
ADDRESS:................................................................................................................... 65
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WM9711L PIN CONFIGURATION
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ORDERING INFORMATION
DEVICE WM9711LGEFL/V WM9711LGEFL/RV TEMPERATURE RANGE -25 to +85oC -25 to +85oC PACKAGE 48-lead QFN (Pb-free) 48-lead QFN (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL3 MSL3 PEAK SOLDERING TEMPERATURE 260oC 260oC
Note: Reel quantity = 2,200
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WM9711L
PIN DESCRIPTION
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 NAME DBVDD XTLIN XTLOUT DGND1 SDATAOUT BITCLK DGND2 SDATAIN DCVDD SYNC RESETB CREF AVDD2 DNC DNC DNC DNC AGND1 PCBEEP PHONE MIC1 MIC2 LINEINL LINEINR AVDD AGND VREF MICBIAS COMP1 COMP2 COMP3 CAP2 MONOOUT SPKGND LOUT2 ROUT2 OUT3 SPKVDD HPOUTL HPGND HPOUTR AGND2 HPVDD GPIO1 GPIO2 / IRQ GPIO3 GPIO4 GPIO5 / SPDIF_OUT TYPE Supply Digital Input Digital Output Supply Digital Input Digital Output Supply Digital Output Supply Digital Input Digital Input Analogue Input Supply Do not connect Do not connect Do not connect Do not connect Supply Analogue Input Analogue Input Analogue Input Analogue Input Analogue Input Analogue Input Supply Supply Analogue Output Analogue Output Analogue Input Analogue Input Analogue Input Analogue In / Out Analogue Output Supply Analogue Output Analogue Output Analogue Output Supply Analogue Output Supply Analogue Output Supply Digital In / Out Digital In / Out Digital In / Out Digital In / Out Digital In / Out Digital In / Out Digital I/O Buffer Supply Clock Crystal Connection 1 / External Clock Input Clock Crystal Connection 2 Digital Ground (return path for both DCVDD and DBVDD) Serial Data Output from Controller / Input to WM9711L Serial Interface Clock Output to Controller Digital Ground (return path for both DCVDD and DBVDD) Serial Data Input to Controller / Output from WM9711L Digital Core Supply Serial Interface Synchronisation Pulse from Controller Reset (Active Low, resets all registers to their default) Reference for analogue comparators (COMP1,2,3) Connect to AVDD Leave this pin floating Leave this pin floating Leave this pin floating Leave this pin floating Connect to AGND Line Input to analogue audio mixers, typically used for beeps Phone Input (RX) Left Microphone Input Right Microphone Input Left Line Input Right Line Input Analogue Supply (feeds audio DACs, ADCs, PGAs, mic boost, mixers) Analogue Ground Internal Reference Voltage (buffered CAP2) Bias Voltage for Microphones (buffered CAP2 x 1.8) Comparator Input 1 Comparator Input 2 Comparator Input 3 Internal Reference Voltage (normally AVDD/2, if not overdriven) Mono Output, intended for Phone TX signal Speaker Ground (feeds output buffers on pins 35 and 36) Left Output 2 (Speaker, Line or Headphone) Right Output 2 (Speaker, Line or Headphone) Analogue Output 3 (from AUXDAC or headphone pseudo-ground) Speaker Supply (feeds output buffers on pins 35 and 36) Headphone Left Output Headphone Ground (feeds output buffers on pins 37, 39, 41) Headphone Left Output Chip Substrate, connect to AGND Headphone Supply (feeds output buffers on pins 37, 39, 41) GPIO Pin 1 GPIO Pin 2 or IRQ (Interrupt Request) Output GPIO Pin 3 GPIO Pin 4 (On reset, pin level configures device power up status. See Applications section for external components configuration) GPIO Pin 5 or SPDIF Digital Audio Output DESCRIPTION
Note: It is recommended that the QFN ground paddle should be connected to analogue ground on the application PCB.
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WM9711L ABSOLUTE MAXIMUM RATINGS
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Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified. ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage conditions prior to surface mount assembly. These levels are: MSL1 = unlimited floor life at <30C / 85% Relative Humidity. Not normally stored in moisture barrier bag. MSL2 = out of bag storage for 1 year at <30C / 60% Relative Humidity. Supplied in moisture barrier bag. MSL3 = out of bag storage for 168 hours at <30C / 60% Relative Humidity. Supplied in moisture barrier bag. The Moisture Sensitivity Level for each package type is specified in Ordering Information. CONDITION Digital supply voltages (DCVDD, DBVDD) Analogue supply voltages (AVDD, HPVDD, SPKVDD) Voltage range digital inputs Voltage range analogue inputs Voltage range, COMP3 (pin31) Operating temperature range, TA -25oC MIN -0.3V -0.3V DGND -0.3V AGND -0.3V MAX +3.63V +3.63V DBVDD +0.3V AVDD +0.3V +5V +85oC
RECOMMENDED OPERATING CONDITIONS
PARAMETER Digital input/output buffer supply range Digital core supply range Analogue supply range Digital ground Analogue ground Difference AGND to DGND Notes: 1. 2. 3. AGND is normally the same potential as DGND. AVDD, DCVDD and DBVDD can all be different Digital supplies (DCVDD, DBVDD) must not exceed analogue supplies (AVDD, HPVDD, SPKVDD) by more than 0.3V SYMBOL DBVDD DCVDD AVDD, HPVDD, SPKVDD DCGND, DBGND AGND, HPGND, SPKGND Note 1 -0.3 TEST CONDITIONS MIN 1.8 1.8 1.8 0 0 0 +0.3 TYP MAX 3.6 3.6 3.6 UNIT V V V V V V
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WM9711L
ELECTRICAL CHARACTERISTICS
AUDIO OUTPUTS
Test Conditions DBVDD=3.3V, DCVDD = 3.3V, AVDD=HPVDD=SPKVDD =3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 18-bit audio data unless otherwise stated. PARAMETER Full-scale output Signal to Noise Ratio (A-weighted) Total Harmonic Distortion Power Supply Rejection Output Power Output Power at 1% THD Abs. Max Output Power Total Harmonic Distortion Signal to Noise Ratio (A-weighted) SNR THD PSRR PO PO POmax THD SNR PO=200mW 90 -3dB output 20Hz to 20kHz SYMBOL TEST CONDITIONS AVDD = 3.3V, PGA gains set to 0dB 85 MIN TYP 1 94 -87 50 -80 MAX UNIT V rms dB dB dB DAC to Line-Out (HPOUTL/R or MONOOUT with 10k / 50pF load)
Speaker Output (LOUT2/ROUT2 with 8 bridge tied load, INV=1) Output power is very closely correlated with THD; see below. 400 500 -66 0.05 100 mW mW dB % dB
Headphone Output (HPOUTL/R, OUT3 or LOUT2/ROUT2 with 16 or 32 load) HPVDD=1.8V, RL=32 Total Harmonic Distortion (Note 1) THD PO=10mW, RL=16 PO=10mW, RL=32 PO=20mW, RL=16 PO=20mW, RL=32 Signal to Noise Ratio (A-weighted) Note: 1. All THD values are valid for the output power level quoted above - for example, at HPVDD=3.3V and RL=16, THD is -76dB when output power is 10mW. Higher output power is possible, but will result in a deterioration in THD. SNR AVDD=3.3V 90 5 -76 -73 -75 -78 95 dB mW dB
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WM9711L
AUDIO INPUTS
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Test Conditions DBVDD=3.3V, DCVDD = 3.3V, AVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 18-bit audio data unless otherwise stated. PARAMETER Full Scale Input Signal Level (for ADC 0dB Input at 0dB Gain) SYMBOL VINFS TEST CONDITIONS AVDD = 3.3V AVDD = 1.8V differential input mode (MS = 01) Input Resistance Input Capacitance Line input to ADC (LINEINL, LINEINR, PHONE) Signal to Noise Ratio (A-weighted) Total Harmonic Distortion Power Supply Rejection Signal to Noise Ratio (A-weighted) Total Harmonic Distortion Power Supply Rejection Ratio Common Mode Rejection Ratio SNR THD PSRR SNR THD PSRR CMRR -6dBFs 20Hz to 20kHz 20dB boost enabled 20dB boost enabled TBD Differential mic mode 85 92 -87 50 80 -80 50 TBD -80 dB dB dB dB dB dB dB RIN 0dB PGA gain 12dB PGA gain 10 MIN TYP 1.0 0.545 half of the value listed above 34 16 5 22 pF k MAX UNIT V rms LINEINL/R, MICL/R and PHONE pins
Microphone input to ADC (MIC1/2 pins)
AUXILIARY MONO DAC (AUXDAC)
Test Conditions AVDD = 3.3V, TA = +25oC, unless otherwise stated. PARAMETER Resolution Full scale output voltage Signal to Noise Ratio (A-weighted) Total Harmonic Distortion SNR THD AVDD=3.3V 65 SYMBOL TEST CONDITIONS MIN TYP 12 1 70 -62 -50 MAX UNIT bits Vrms dB dB
COMPARATORS
Test Conditions AVDD = 3.3V, TA = +25oC, unless otherwise stated. PARAMETER Input Voltage Input leakage current Comparator Input Offset (COMP1, COMP2 only) COMP2 delay (COMP2 only) 24.576MHz crystal -50 0 SYMBOL TEST CONDITIONS MIN AGND <10 +50 10.9 TYP MAX AVDD UNIT V nA mV s COMP1, COMP2 and COMP3 (pins 29, 30, 31)
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WM9711L
REFERENCE VOLTAGES
Test Conditions DBVDD=3.3V, DCVDD = 3.3V, AVDD = 3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 18-bit audio data unless otherwise stated. PARAMETER Audio ADCs, DACs, Mixers Reference Input/Output Buffered Reference Output Microphone Bias Bias Voltage Bias Current Source Output Noise Voltage VMICBIAS IMICBIAS Vn 1K to 20kHz 15 2.88 2.97 3.06 3 V mA nV/Hz CAP2 pin VREF pin 1.6 1.6 1.65 1.65 1.7 1.7 V V SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
DIGITAL INTERFACE CHARACTERISTICS
Test Conditions o DBVDD = 3.3V, DCVDD = 3.3V, TA = +25 C, unless otherwise stated. PARAMETER Input HIGH level Input LOW level Output HIGH level Output LOW level Clock Frequency Master clock (XTLIN pin) AC'97 bit clock (BIT_CLK pin) AC'97 sync pulse (SYNC pin) Note: 1. 2. All audio and non-audio sample rates and other timing scales proportionately with the master clock. For signal timing on the AC-Link, please refer to the AC'97 specification (Revision 2.2) 24.576 12.288 48 MHz MHz kHz SYMBOL VIH VIL VOH VOL source current = 2mA sink current = 2mA DBVDDx0.9 DBVDDx0.1 TEST CONDITIONS MIN DBVDDx0.7 DBVDDx0.3 TYP MAX UNIT V V Digital Logic Levels (all digital input or output pins) - CMOS Levels
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WM9711L
HEADPHONE / SPEAKER OUTPUT THD VERSUS POWER
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-20 Headphone Power vs THD+N (32Ohm load)
-40
THD+N (dB)
-60
-80
-100 0 5 10 15 Power (mW) 20 25 30
-20
Headphone Power vs THD+N (16Ohm load)
-40
THD+N (dB)
-60
-80
-100 0 10 20 30 Power (mW) 40 50 60
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WM9711L
POWER CONSUMPTION
The power consumption of the WM9711L depends on the following factors. * Supply voltages: Reducing the supply voltages also reduces digital supply currents, and therefore results in significant power savings especially in the digital sections of the WM9711L. * Operating mode: Significant power savings can be achieved by always disabling parts of the WM9711L that are not used (e.g. audio ADC, DAC, AUXDAC, speaker driver, etc.)
26h 14:8 24h 15:0 Other Settings V 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 3.3 2.5 1.8 AVDD I (mA) 0.0005 0.0004 0.0003 0.005 0.004 0.003 0.56 0.37 0.241 1.1 0.76 0.508 2.36 1.838 1.218 2.385 1.837 1.218 3.27 2.66 1.838 9.461 7.46 5.318 3.45 2.549 1.738 3.62 2.71 1.748 3.62 2.71 1.748 9.593 7.37 5.388 DCVDD V I (mA) 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 11.21 2.5 7.78 1.8 5.21 3.3 12.22 2.5 8.552 1.8 5.799 3.3 9.884 2.5 6.755 1.8 4.606 3.3 9.8 2.5 6.78 1.8 4.606 3.3 9.8 2.5 6.78 1.8 4.606 3.3 12.26 2.5 8.563 1.8 5.8 DBVDD V I (mA) 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 0 2.5 0 1.8 0 3.3 2.6 2.5 2.13 1.8 1.41 3.3 2.62 2.5 2.1 1.8 1.48 3.3 2.6 2.5 2.1 1.8 1.41 3.3 2.6 2.5 2.1 1.8 1.47 3.3 2.6 2.5 2.1 1.8 1.41 3.3 2.62 2.5 2.12 1.8 1.48 Total Power (mW) 0.00165 0.001 0.00054 0.0165 0.01 0.0054 1.848 0.925 0.4338 3.63 1.9 0.9144 7.788 4.595 2.1924 7.8705 4.5925 2.1924 56.364 31.425 15.2244 80.1933 45.28 22.6746 52.5822 28.51 13.9572 52.866 28.975 14.0832 52.866 28.975 13.9752 80.7609 45.1325 22.8024
Mode Description OFF (lowest possible power) Clocks stopped LPS (Low Power Standby) VREF maintained using 1MOhm string Standby Mode (ready to playback) VREF maintained using 50kOhm string
1111111 0111111111111111 58h, SVD = 1
1111111 0111111111111111
1110111 0111111111111111
"Idle" Mode 1100111 0111111111111111 VREF maintained using 50kOhm string use LPS mode instead, if possible Phone Call - using headphone / ear speaker 0110011 0111100010101100 0Eh, bit 7 = 1 HPOUTL, HPOUTR and OUT3 active (mic gain boost) AC-Link stopped Phone Call - using loudspeaker 1110011 0111101100110100 0Eh, bit 7 = 1 AC-Link stopped (mic gain boost) Record from mono microphone with MICBIAS all analogue outputs disabled Record phone call both sides mixed to mono call using headphone / ear speaker DAC Playback - using loudspeaker 1000110 0110101111111111 0Eh, bit 7 = 1 (mic gain boost) 0000000 0000000010001000 0Eh, bit 7 = 1 (mic gain boost) 1000001 0001111101110111
DAC Playback - using headphone
0000001 0001110011101111
DAC Playback - to Line-out
0000001 0001110011110111
Maximum Power (everything on)
0000000 0000000000000000 0Eh, bit 7 = 1 (mic gain boost)
Table 1 Supply Current Consumption (Simulation) Notes: 1. 2. All figures are at TA = +25oC, audio sample rate fs = 48kHz, with zero signal (quiescent). The power dissipated in the headphone and speaker is not included in the above table.
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WM9711L DEVICE DESCRIPTION
INTRODUCTION
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The WM9711L is designed to meet the mixed-signal requirements of portable and wireless computer systems. It includes audio recording and playback, analogue comparators for battery alarms, and GPIO functions, all controlled through a single 5-wire AC-Link interface.
SOFTWARE SUPPORT
The basic audio features of the WM9711L are software compatible with standard AC'97 device drivers. However, to better support its unique and additional functions, Wolfson Microelectronics supplies custom device drivers for selected CPUs and operating systems. Please contact your local Wolfson Sales Office for more information.
AC'97 COMPATIBILITY
The WM9711L uses an AC'97 interface to communicate with a microprocessor or controller. The audio and GPIO functions are largely compliant with AC'97 Revision 2.2. The following differences from the AC'97 standard are noted: * Pinout: The function of some pins has been changed to support device specific features. The PHONE and PCBEEP pins have been moved to different locations on the device package. Audio mixing: The WM9711L handles all the audio functions of a smartphone, including audio playback, voice recording, phone calls, phone call recording, ring tones, as well as simultaneous use of these features. The AC'97 mixer architecture does not fully support this. The WM9711L therefore uses a modified AC'97 mixer architecture with three separate mixers. Tone Control, Bass Boost and 3D Enhancement: These functions are implemented in the digital domain and therefore affect only signals being played through the audio DACs, not all output signals as stipulated in AC'97.
*
*
Some other functions are additional to AC'97: * * * * * On-chip BTL loudspeaker driver On-chip BTL driver for ear speaker (phone receiver) Auxiliary mono DAC for ring tones, system alerts etc. 2 Analogue Comparators for Battery Alarm Programmable Filter Characteristics for Tone Control and 3D Enhancement
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WM9711L
AUDIO PATHS OVERVIEW
20h:7 (Loopback) 18h:12-8 00000 = +12dB 11111 = -34.5dB
L
LINEINL Pin 23
ADC Left AC Link
1 0
Slot 3 Tone and 3D 08h / 22h / 20h:13 (3DE)
Left Channel 18 Bit DAC
PCM PGA
to SPKR MIXER
18 h 10 :15 h: 1 0C 5 h:1 5 0Ah :15 -12 14h:15-12
L Line Volume 02h:12-8 00000 = 0dB 11111 = -46.5dB 1 headphone mixer L 0 02h:6 (INV) Zerocross detect 02h:7 (ZC) 02h:15 (MUTE)
LOUT2 Pin 35
10h:12-8 00000 = +12dB 11111 = -34.5dB LINEL PGA to SPKR MIXER
6dB -> -15dB
6dB -> -15dB
6dB -> -15dB
6dB -> -15dB
6dB -> -15dB
-12 14h:15 1-7 h:1 7 14 1:1 2 h 14 5-1 1 h: 12
1 0 16h:8 (SRC)
PCBEEP Pin 19
0Ch:0-4 00000 = +12dB 11111 = -34.5dB
6dB -> -15dB
L Headphone Volume 04h:12-8 00000 = 0dB 11111 = -46.5dB
HPOUTL Pin 39
Zerocross detect
10 h 10 :13 h: 1 18 3 h:1 3
PHONE Pin 20
PHONE PGA
04h:7 (ZC) 04h:15 (MUTE) Phone Mixer
0Eh:12-8 00000 = +12dB 11111 = -34.5dB
6dB -> -15dB
18h :13 0Ah7:4
0dB / 20dB
MIC1 Pin 21
MICL PGA OEh:6-5 (MS)
0dB / 20dB
1 1 2 Ah : h:7 13 -4 -11
14+7 0Eh: 7 3+ h:1 1 0E -1 13 h: 1A
Mono Volume 06h:4-0 00000 = 0dB 11111 = -46.5dB
0dB / 20dB
MONOOUT Pin 33
Zerocross detect 06h:7 (ZC) 06h:15 (MUTE)
0dB / 20dB
6dB -> -15dB
PCBEEP
1Ah[10:8] = 110 Note: MS bits also affect sidetone path 1Ah[10:8] = 101 Gain Ranges: 1Ch:13 (GRL=0) 1Ch:11:8 0000 = 0db 1111 = +22.5dB 1Ch:6 (GRL=1) 1Ch:13-8 11111 = +30dB 00000 = -17.25dB ADC PGA
PHONE DACR LINER MICR MICL ALCL ALCR AUXDAC MONOMIX SPKRMIX
OUT3 Volume 16h:4-0 00000 = 0dB 11111 = -46.5dB
(1Ah[10:8] = 000) & (MS = 01) (1Ah[10:8] = 000) & (MS = 00 or 11) 1Ah[10:8] = 111 1Ah[10:8] = 100 (1Ah[10:8] = 000) & (MS = 10) 1Ah[10:8] = 011 1Ah: 10-8
1Ah:14 0 = 0dB 1 = 20dB
1Ch:15 (Mute)
Left Channel 18 Bit ADC Variable Slot 5C:1-0 (ASS) 5C:3 (HPF) 5C:4 (ADCO) ALC:5Ch/60h/62h
16h:10-9 (OUT3SRC)
Zero- Pin cross detect
OUT3 37
AC Link
16h:7 (ZC) 16h:15 (MUTE)
AUXDAC ALCR ALCL MICL MICR LINER DACR
R
LINEINR Pin 24
20h:7 (Loopback) ADC Right AC Link 1 0 Slot 4 Tone and 3D 08h / 22h / 20h:13 (3DE)
18h:4-0 00000 = +12dB 11111 = -34.5dB
PHONE PCBEEP MONOMIX SPKRMIX
Right Channel 18 Bit DAC
PCM PGA
10h:5-0 00000 = +12dB 11111 = -34.5dB LINER PGA
12 Bit Resistor string DAC 2Eh/64h/12h:0(EN)
5Ch:8 (DS) 0Eh:5-0 00000 = +12dB 11111 = -34.5dB MS = 01
18 h 10 :15 h:1 0C 5 h:1 6dB -> -15dB 5 0Ah :15-1 2 6dB -> -15dB 14h:15-12
6dB -> -15dB
headphone mixer R
R Headphone Volume 04h:4-0 00000 = 0dB 11111 = -46.5dB
MICR PGA MS = 10 or 11 0Eh:6-5 (MS) Note: MS bits also affect ADC input path from MICs
6dB -> -15dB
6dB -> -15dB
2 15-1 14h: 1-8 h:1 8 14 1h:1 2 14 5-1 h:1 12
HPOUTR Pin 41
Zerocross detect 04h:7 (ZC) 04h:15 (MUTE)
MIC2 Pin 22
6dB -> -15dB
FROM LINEL PGA
10 h: 10 14 h1 4 18 h:1 4 18h :14
R Line Volume 02h:4-0 00000 = 0dB 11111 = -46.5dB 16h:8 (SRC) Speaker Mixer 1 0 Zerocross detect 02h:7 (ZC) 02h:15 (MUTE)
ROUT2 Pin 36
FROM DACL
0Ch:14
6dB -> -15dB
1Ah[2:0] = 110 Note: MS bits also affect 1Ah[2:0] = 101 sidetone path (1Ah[2:0] = 000) & (MS = 01) (1Ah[2:0] = 000) & (MS = 10 or 11) (1Ah[2:0] = 000) & (MS = 00) 1Ah[2:0] = 111 1Ah[2:0] = 100 1Ah[2:0] = 011 ADC PGA 1Ch:15 (Mute) 1Ah: 2-0
6dB -> -15dB
11-8 0Ah: 1-8 h:1 12
Gain Ranges: 1Ch:6 (GRR=0) 1Ch:3:0 0000 = 0db 1111 = +22.5dB 1Ch:6 (GRR=1) 1Ch:5-0 11111 = +30dB 00000 = -17.25dB
PR3 (REF disable) & 58h:10 (SVD) 1Ah:14 0 = 0dB 1 = 20dB 4.5k Right Channel 18 Bit ADC Variable Slot 5C:1-0 (ASS) 5C:3 (HPF) 5C:4 (ADCO) ALC:5Ch/60h/62h 3.6k
MICBIAS Pin 28
AC Link
500k
50k
500k
50k
AVDD Pin 25
AGND Pin 24
CAP2 Pin 32
VREF Pin 27
Figure 1 Audio Paths Overview
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WM9711L AUDIO INPUTS
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The following sections give an overview of the analogue audio input pins and their function. For more information on recommended external components, please refer to the "Applications Information" section.
LINE INPUT
The LINEINL and LINEINR inputs are designed to record line level signals, and/or to mix into one of the analogue outputs. Both pins are directly connected to the record selector. The record PGA adjusts the recording volume, controlled by register 1Ch or by the ALC function. For analogue mixing, the line input signals pass through a separate PGA, controlled by register 10h. The signals can be routed into all three output mixers (headphone, speaker and phone). Each LINEIN-to-mixer path has an independent mute bit. When the line inputs are not used, the line-in PGA can be switched off to save power (see "Power Management" section). LINEINL and LINEINR are biased internally to the reference voltage VREF. Whenever the inputs are muted or the device placed into standby mode, the inputs remain biased to VREF using special antithump circuitry to suppress any audible clicks when changing inputs. REGISTER ADDRESS 10h BIT 12:8 LABEL LINEINL VOL DEFAULT 01000 (0dB) DESCRIPTION LINEINL input gain 00000: +12dB ... (1.5dB steps) 11111: -34.5dB LINEINR input gain similar to LINEINLVOL Mute LINEIN path to headphone mixer 1: Mute, 0: No mute (ON) Mute LINEIN path to speaker mixer 1: Mute, 0: No mute (ON) Mute LINEIN path to phone mixer 1: Mute, 0: No mute (ON)
4:0 15 14 13
LINEINR VOL L2H L2S L2P
01000 (0dB) 1 1 1
Table 2 Line Input Control
MICROPHONE INPUT
The MIC1 and MIC2 inputs are designed for direct connection to single-ended mono, stereo or differential mono microphone. If the microphone is mono, the same signal appears on both left and right channels. In stereo mode, MIC1 is routed to the left and MIC2 to the right channel. For voice recording, the microphone signal is directly connected to the record selector. The record PGA adjusts the recording volume, controlled by register 1Ch or by the ALC function. For analogue mixing, the signal passes through a separate PGA, controlled by register 0Eh. The microphone signal can be routed into the phone mixer (for normal phone call operation) and/or the headphone mixer (using register 14h, see "Audio Mixers / Sidetone Control" section), but not into the speaker mixer (to prevent acoustic feedback from the speaker into the microphone). When the microphone inputs are not used, the microphone PGA can be switched off to save power (see "Power Management" section). MIC1 and MIC2 are biased internally to the reference voltage VREF. Whenever the inputs are muted or the device placed into standby mode, the inputs remain biased to VREF using special anti-thump circuitry to suppress any audible clicks when changing inputs. It is also possible to use the LINEINL and LINEINR pins as a second differential microphone input. This is achieved by setting the DS bit (register 5Ch, bit 11) to `1'. This disables the line-in audio paths
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and routes the signal from LINEINL and LINEINR through the differential mic path, as if it came from the MIC1 and MIC2 pins. Only one differential microphone be used at a time. The DS bit only has an effect when MS = 01 (differential mode). REGISTER ADDRESS 0Eh Mic Volume BIT 14 13 12:8 LABEL M12P M22P LMICVOL DEFAULT 1 1 01000 (0dB) 0 DESCRIPTION Mute MIC1 path to phone mixer 1: Mute, 0: No mute (ON) Mute MIC2 path to phone mixer 1: Mute, 0: No mute (ON) Left microphone volume Only used when MS = 11 Similar to MICVOL Microphone gain boost (Note 1) 1: 20dB boost ON 0: No boost (0dB gain) Microphone mode select 00 Single-ended mono (left) left = right = MIC1 (pin 21) Volume controlled by MICVOL Differential mono mode left = right = MIC1 - MIC2 Volume controlled by MICVOL Single-ended mono (right) left = right = MIC2 (pin 22) Volume controlled by MICVOL : Stereo mode MIC1 = left, MIC2 = right Left Volume controlled by LMICVOL Right volume controlled by MICVOL
7
20dB
6:5
MS
00
01
10
11
4:0
MICVOL
01000 (0dB)
Microphone volume to mixers 00000: +12dB ... (1.5dB steps) 11111: -34.5dB Differential Microphone Select 0 : Use MIC1 and MIC2 1: Use LINEL and LINER (Note 2)
Reg 5Ch Additional Analogue Functions
8
DS
0
Table 3 Microphone Input Control Note: 1. The 20dB gain boost acts on the input to the phone mixer only. A separate microphone boost for recording can be enabled using the BOOST bit in register 1Ah. When the LINEL and LINER are selected for differential microphone select then the MIC1 and MIC2 input pins become disabled, these signals can therefore not be routed internally to the device.
2.
MICROPHONE BIAS
The MICBIAS output (pin 28) provides a low noise reference voltage suitable for biasing electret type microphones and the associated external resistor biasing network. The internal MICBIAS circuitry is shown below. Note that the maximum source current capability for MICBIAS is 3mA. The external biasing resistors and microphone cartridge therefore must limit the MICBIAS current to 3mA.
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WM9711L
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CAP2 MICBIAS = 1.8 x CAP2 = 0.9 X AVDD
WM9711L
AGND
Figure 2 Microphone Bias Schematic
PHONE INPUT
Pin 20 (PHONE) is a mono, line level input designed to connect to the receive path of a telephony device. The pin connects directly to the record selector for phone call recording (Note: to record both sides of a phone call, one ADC channel should record the PHONE signal while the other channel records the MIC signal). The RECVOL PGA adjusts the recording volume, controlled by register 1Ch or by the ALC function. To listen to the PHONE signal, the signal passes through a separate PGA, controlled by register 0Ch. The signal can be routed into the headphone mixer (for normal phone call operation) and/or the speaker mixer (for speakerphone operation), but not into the phone mixer (to prevent forming a feedback loop). When the phone input is not used, the phone-in PGA can be switched off to save power (see "Power Management" section). PHONE is biased internally to the reference voltage VREF. Whenever the input is muted or the device placed into standby mode, the input remains biased to VREF using special anti-thump circuitry to suppress any audible clicks when changing inputs. REGISTER ADDRESS 0Ch Phone Input BIT 15 14 4:0 LABEL P2H P2S PHONE VOL DEFAULT 1 1 01000 (0dB) DESCRIPTION Mute PHONE path to headphone mixer 1: Mute, 0: No mute (ON) Mute PHONE path to speaker mixer 1: Mute, 0: No mute (ON) PHONE input gain 00000: +12dB ... (1.5dB steps) 11111: -34.5dB
Table 4 Phone Input Control
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Pin 19 (PCBEEP) is a mono, line level input intended for externally generated signal or warning tones. It is routed directly to the record selector and all three output mixers, without an input amplifier. The signal gain into each mixer can be independently controlled, with a separate mute bit for each signal path. REGISTER ADDRESS 0Ah PCBEEP input 15 14:12 BIT LABEL B2H B2HVOL DEFAULT 1 010 (0dB) DESCRIPTION Mute PCBEEP path to headphone mixer 1: Mute, 0: No mute (ON) PCBEEP to headphone mixer gain 000: +6dB ... (3dB steps) 111: -15dB Mute PCBEEP path to speaker mixer 1: Mute, 0: No mute (ON) PCBEEP to speaker mixer gain 000: +6dB ... (3dB steps) 111: -15dB Mute PCBEEP path to phone mixer 1: Mute, 0: No mute (ON) PCBEEP to phone mixer gain 000: +6dB ... (3dB steps) 111: -15dB
PCBEEP INPUT
11 10:8
B2S B2SVOL
1 010 (0dB)
7 6:4
B2P B2PVOL
1 010 (0dB)
Table 5 PCBEEP Control
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WM9711L AUDIO ADC
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The WM9711L has a stereo sigma-delta ADC to digitise audio signals. The ADC achieves high quality audio recording at low power consumption. The ADC sample rate can be controlled by writing to a control register (see "Variable Rate Audio"). It is independent of the DAC sample rate. To save power, the left and right ADCs can be separately switched off using the PD11 and PD12 bits, whereas PR0 disables both ADCs (see "Power Management" section). If only one ADC is running, the same ADC data appears on both the left and right AC-Link slots.
HIGH PASS FILTER
The WM9711L audio ADC incorporates a digital high-pass filter that eliminates any DC bias from the ADC output data. The filter is enabled by default. For DC measurements, it can be disabled by writing a `1' to the HPF bit (register 5Ch, bit 3).
ADC SLOT MAPPING
By default, the output of the left audio ADC appears on slot 3 of the SDATAIN signal (pin 8), and the right ADC data appears on slot 4. However, the ADC output data can also be sent to other slots, by setting the ASS (ADC slot select) control bits as shown below. REGISTER ADDRESS 5Ch Additional Function Control BIT 3 LABEL HPF DEFAULT 0 DESCRIPTION High-pass filter disable 0: Filter enabled (for audio) 1: Filter disabled (for DC measurements) ADC to slot mapping 00: Left = Slot 3, Right = Slot 4 (default) 01: Left = Slot 7, Right = Slot 8 10: Left = Slot 6, Right = Slot 9 11: Left = Slot 10, Right = Slot 11
1:0
ASS
00
Table 6 ADC Slot Mapping
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The record selector determines which input signals are routed into the audio ADC. The left and right channels can be selected independently. This is useful for recording a phone call: one channel can be used for the RX signal and the other for the TX signal, so that both sides of the conversation are digitised. REGISTER ADDRESS 1Ah Record Select BIT 14 LABEL BOOST DEFAULT 0 DESCRIPTION 20dB Boost 1: Boost ADC input signal by 20dB 0 :No boost Record to phone path enable 00: Left ADC and Right ADC to phone mixer 01 : Left ADC to phone mixer 10: Right ADC to phone imixer 11 : Muted 20dB Boost for ADC to phone signal 1: Boost signal by 20dB 0 :No boost Left ADC signal source 000: MIC* (pre-PGA) 001-010: Reserved (do not use this setting) 011: Speaker mix 100: LINEINL (pre-PGA) 101: Headphone Mix (left) 110: Phone Mix 111: PHONE (pre-PGA) Right ADC signal source 000: MIC* (pre-PGA) 001-010: Reserved (do not use this setting) 011: Speaker mix 100: LINEINR (pre-PGA) 101: Headphone Mix (right) 110: Phone Mix 111: PHONE (pre-PGA)
RECORD SELECTOR
13:12
R2P
11
11
R2PBOOST
0
10:8
RECSL
000
2:0
RECSR
000
Table 7 Audio Record Selector Note: *In stereo mic mode, MIC1 is routed to the left ADC and MIC2 to the right ADC. In all mono mic modes, the same signal (MIC1, MIC2 or MIC1-MIC2) is routed to both the left and right ADCs. See "Microphone Input" section for details.
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WM9711L
RECORD GAIN
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The amplitude of the signal that enters the audio ADC is controlled by the Record PGA (Programmable Gain Amplifier). The PGA gain can be programmed either by writing to the Record Gain register, or by the Automatic Level Control (ALC) circuit (see next section). When the ALC is enabled, any writes to the Record Gain register have no effect. Two different gain ranges can be implemented: the standard gain range defined in the AC'97 standard, or an extended gain range with smaller gain steps. The ALC circuit always uses the extended gain range, as this has been found to result in better sound quality. The output of the Record PGA can also be mixed into the phone and/or headphone outputs (see "Audio Mixers"). This makes it possible to use the ALC function for the microphone signal in a smartphone application. REGISTER ADDRESS 1Ch Record Gain BIT 15 LABEL RMU DEFAULT 1 DESCRIPTION Mute Audio ADC (both channels) 1: Mute (OFF) 0: No Mute (ON) Gain range select (left) 0: Standard (0 to 22.5dB, 1.5dB step size) 1: Extended (-17.25 to +30dB, 0.75dB steps) Record Volume (left) Standard (GRL=0) XX0000: 0dB XX0001: +1.5dB ... (1.5dB steps) XX1111: +22.5dB 7 ZC 0 Extended (GRL=1) 000000: -17.25dB 000001: -16.5dB ... (0.75dB steps) 111111: +30dB
14
GRL
0
13:8
RECVOLL
000000
Zero Cross Enable 0: Record Gain changes immediately 1: Record Gain changes when signal is zero or after time-out Gain range select (right) Similar to GRL Record Volume (right) Similar to RECVOLL
6 5:0
GRR RECVOLR
0 000000
Table 8 Record Gain Register
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The WM9711L has an automatic level control that aims to keep a constant recording volume irrespective of the input signal level. This is achieved by continuously adjusting the PGA gain so that the signal level at the ADC input remains constant. A digital peak detector monitors the ADC output and changes the PGA gain if necessary.
AUTOMATIC LEVEL CONTROL
input signal
PGA gain
signal after ALC
ALC target level
hold time
decay time
attack time
Figure 3 ALC Operation The ALC function is enabled using the ALCSEL control bits. When enabled, the recording volume can be programmed between -6dB and -28.5dB (relative to ADC full scale) using the ALCL register bits. HLD, DCY and ATK control the hold, decay and attack times, respectively: Hold time is the time delay between the peak level detected being below target and the PGA gain beginning to ramp up. It can be programmed in power-of-two (2n) steps, e.g. 2.67ms, 5.33ms, 10.67ms etc. up to 43.7s. Alternatively, the hold time can also be set to zero. The hold time only applies to gain ramp-up, there is no delay before ramping the gain down when the signal level is above target. Decay (Gain Ramp-Up) Time is the time that it takes for the PGA gain to ramp up across 90% of its range (e.g. from -15B up to 27.75dB). The time it takes for the recording level to return to its target value therefore depends on both the decay time and on the gain adjustment required. If the gain adjustment is small, it will be shorter than the decay time. The decay time can be programmed in power-of-two (2n) steps, from 24ms, 48ms, 96ms, etc. to 24.58s. Attack (Gain Ramp-Down) Time is the time that it takes for the PGA gain to ramp down across 90% of its range (e.g. from 27.75dB down to -15B gain). The time it takes for the recording level to return to its target value therefore depends on both the attack time and on the gain adjustment required. If the gain adjustment is small, it will be shorter than the attack time. The attack time can be programmed in power-of-two (2 ) steps, from 6ms, 12ms, 24ms, etc. to 6.14s. When operating in stereo, the peak detector takes the maximum of left and right channel peak values, and any new gain setting is applied to both left and right PGAs, so that the stereo image is preserved. However, the ALC function can also be enabled on one channel only. In this case, only one PGA is controlled by the ALC mechanism, while the other channel runs independently with its PGA gain set through the control register.
n
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WM9711L
REGISTER ADDRESS 62h ALC / Noise Gate Control BIT 15:14 LABEL ALCSEL DEFAULT 00 (OFF)
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DESCRIPTION ALC function select 00 = ALC off (PGA gain set by register) 01 = Right channel only 10 = Left channel only 11 = Stereo (PGA registers unused) Note: Ensure that RECVOLL and RECVOLR settings (reg. 1Ch) are the same before entering this mode. PGA gain limit for ALC 111 = +30dB 110 = +24dB ....(6dB steps) 001 = -6dB 000 = -12dB Programmable zero cross timeout 11 217 x MCLK period 10 216 x MCLK period 01 215 x MCLK period 00 214 x MCLK period ALC Zero Cross enable (overrides ZC bit in register 1Ch) 0: PGA Gain changes immediately 1: PGA Gain changes when signal is zero or after time-out ALC target - sets signal level at ADC input 0000 = -28.5dB FS 0001 = -27.0dB FS ... (1.5dB steps) 1110 = -7.5dB FS 1111 = -6dB FS ALC hold time before gain is increased. 0000 = 0ms 0001 = 2.67ms 0010 = 5.33ms ... (time doubles with every step) 1111 = 43.691s ALC decay (gain ramp-up) time 0000 = 24ms 0001 = 48ms 0010 = 96ms ... (time doubles with every step) 1010 or higher = 24.58s ALC attack (gain ramp-down) time 0000 = 6ms 0001 = 12ms 0010 = 24ms ... (time doubles with every step) 1010 or higher = 6.14s
13:11
MAXGAIN
111 (+30dB)
10:9
ZC TIMEOUT
11
8
ALCZC
0
60h ALC Control
15:12
ALCL
1011 (-12dB)
11:8
HLD
0000 (0ms)
7:4
DCY
0011 (192ms)
3:0
ATK
0010 (24ms)
Table 9 ALC Control
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MAXIMUM GAIN
The MAXGAIN register sets the maximum gain value that the PGA can be set to whilst under the control of the ALC. This has no effect on the PGA when ALC is not enabled.
PEAK LIMITER
To prevent clipping when a large signal occurs just after a period of quiet, the ALC circuit includes a limiter function. If the ADC input signal exceeds 87.5% of full scale (-1.16dB), the PGA gain is ramped down at the maximum attack rate (as when ATK = 0000), until the signal level falls below 87.5% of full scale. This function is automatically enabled whenever the ALC is enabled. (Note: If ATK = 0000, then the limiter makes no difference to the operation of the ALC. It is designed to prevent clipping when long attack times are used).
NOISE GATE
When the signal is very quiet and consists mainly of noise, the ALC function may cause "noise pumping", i.e. loud hissing noise during silence periods. The WM9711L has a noise gate function that prevents noise pumping by comparing the signal level at the input pins (i.e. before the record PGA) against a noise gate threshold, NGTH. Provided that the noise gate function is enabled (NGAT = 1), the noise gate cuts in when: * Signal level at ADC [dB] < NGTH [dB] + PGA gain [dB] + Mic Boost gain [dB]
This is equivalent to: * Signal level at input pin [dB] < NGTH [dB]
The PGA gain is then held constant (preventing it from ramping up as it normally would when the signal is quiet). If the NGG bit is set, the ADC output is also muted when the noise gate cuts in. The table below summarises the noise gate control register. The NGTH control bits set the noise gate threshold with respect to the ADC full-scale range. The threshold is adjusted in 1.5dB steps. Levels at the extremes of the range may cause inappropriate operation, so care should be taken with set-up of the function. Note that the noise gate only works in conjunction with the ALC function, and always operates on the same channel(s) as the ALC (left, right, both, or none). REGISTER ADDRESS 62h ALC / Noise Gate Control 7 BIT LABEL NGAT DEFAULT 0 DESCRIPTION Noise gate function enable 1 = enable 0 = disable Noise gate type 0 = PGA gain held constant 1 = mute ADC output Noise gate threshold -76.5dBfs -75dBfs ... 1.5 dB steps 11110 -31.5dBfs 11111 -30dBfs
5
NGG
0
4:0
NGTH(4:0)
00000
Table 10 Noise Gate Control
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WM9711L AUDIO DACS
STEREO DAC
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The WM9711L has a stereo sigma-delta DAC that achieves high quality audio playback at low power consumption. Digital tone control, adaptive bass boost and 3-D enhancement functions operate on the digital audio data before it is passed to the stereo DAC. (Contrary to the AC'97 specification, they have no effect on analogue input signals or signals played through the auxiliary DAC. Nevertheless, the ID2 and ID5 bits in the reset register, 00h, are set to `1' to indicate that the WM9711L supports tone control and bass boost.) The DAC output has a PGA for volume control. The DAC sample rate can be controlled by writing to a control register (see "Variable Rate Audio"). It is independent of the ADC sample rate. The left and right DACs can be separately powered down using the PD13 and PD14 control bits, whereas the PR1 bit disables both DACs (see "Power Management" section).
STEREO DAC VOLUME
The volume of the DAC output signal is controlled by a PGA (Programmable Gain Amplifier). It can be mixed into the headphone, speaker and phone output paths (see "Audio Mixers"). REGISTER ADDRESS 18h DAC Volume BIT 15 14 13 12:8 LABEL D2H D2S D2P DACL VOL DEFAULT 1 1 1 01000 (0dB) DESCRIPTION Mute DAC path to headphone mixer 1: Mute, 0: No mute (ON) Mute DAC path to speaker mixer 1: Mute, 0: No mute (ON) Mute DAC path to phone mixer 1: Mute, 0: No mute (ON) Left DAC Volume 00000: +12dB ... (1.5dB steps) 11111: -34.5dB Right DAC Volume similar to DACLVOL Read-only bit to indicate auto-muting 1: DAC auto-muted 0: DAC not muted DAC Auto-Mute Enable 1: Automatically mutes analogue output of stereo DAC if digital input is zero 0: Auto-mute OFF
4:0 5Ch Additional Functions (1) 15
DACR VOL AMUTE
01000 (0dB) N/A
7
AMEN
0
Table 11 Stereo DAC Volume Control
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TONE CONTROL / BASS BOOST
The WM9711L provides separate controls for bass and treble with programmable gains and filter characteristics. This function operates on digital audio data before it is passed to the audio DACs. Bass control can take two different forms: * Linear bass control: bass signals are amplified or attenuated by a user programmable gain. This is independent of signal volume, and very high bass gains on loud signals may lead to signal clipping. Adaptive bass boost: The bass volume is amplified by a variable gain. When the bass volume is low, it is boosted more than when the bass volume is high. This method is recommended because it prevents clipping, and usually sounds more pleasant to the human ear.
*
Treble control applies a user programmable gain, without any adaptive boost function. Treble, linear bass and 3D enhancement can all produce signals that exceed full-scale. In order to avoid limiting under these conditions, it is recommended to set the DAT bit to attenuate the digital input signal by 6dB. The gain at the outputs should be increased by 6dB to compensate for the attenuation. Cut-only tone adjustment and adaptive bass boost cannot produce signals above fullscale and therefore do not require the DAT bit to be set. REGISTER ADDRESS 08h DAC Tone Control BIT 15 LABEL BB DEFAULT 0 Bass Boost 0 = OFF 1 = ON Bass Cut-off Frequency 0 = Low (130Hz at 48kHz sampling) 1 = High (200Hz at 48kHz sampling) Bass Intensity Code 0000 0001 0010 ... 0111 ... 1011-1101 1110 1111 6 DAT 0 BB=0 (Normal) +9dB +9dB +7.5dB (1.5dB steps) 0dB (1.5dB steps) -6dB -6dB Bypass (OFF) BB=1 (Boost) 15 (max) 14 13 ... 8 ... 4-2 1 (min) DESCRIPTION
12
BC
0
11:8
BASS
1111 (OFF)
-6dB attenuation 0 = Off 1 = On Treble Cut-off Frequency 0 = High (8kHz at 48kHz sampling) 1 = Low (4kHz at 48kHz sampling) Treble Intensity 0000 or 0001 = +9dB 0010 = +7.5dB ... (1.5dB steps) 1011 to 1110 = -6dB 1111 = Treble Control Disabled
4
TC
0
3:0
TRBL
1111 (Disabled)
Table 12 DAC Tone Control Note: 1. All cut-off frequencies change proportionally with the DAC sample rate.
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WM9711L
3D STEREO ENHANCEMENT
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The 3D stereo enhancement function artificially increases the separation between the left and right channels by amplifying the (L-R) difference signal in the frequency range where the human ear is sensitive to directionality. The programmable 3D depth setting controls the degree of stereo expansion introduced by the function. Additionally, the upper and lower limits of the frequency range used for 3D enhancement can be selected using the 3DFILT control bits. REGISTER ADDRESS 20h General Purpose 22h DAC 3D Control BIT 13 LABEL 3DE DEFAULT 0 (disabled) 0 DESCRIPTION 3D enhancement enable
5
3DLC
Lower Cut-off Frequency 0 = Low (200Hz at 48kHz sampling) 1 = High (500Hz at 48kHz sampling) Upper Cut-off Frequency 0 = High (2.2kHz at 48kHz sampling) 1 = Low (1.5kHz at 48kHz sampling) 3D Depth 0000: 0% (minimum 3D effect) 0001: 6.67% ... 1110: 93.3% 1111: 100% (maximum)
4
3DUC
0
3:0
3DDEPTH
0000
Table 13 Stereo Enhancement Control Note: 1. All cut-off frequencies change proportionally with the DAC sample rate.
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AUXDAC is a simple 12-bit mono DAC. It can be used to generate DC signals (with the numeric input written into a control register), or AC signals such as telephone-quality ring tones or system beeps (with the input signal supplied through an AC-Link slot). In AC mode (XSLE = 1), the input data is binary offset coded; in DC mode (XSLE = 0), there is no offset. The analogue output of AUXDAC is routed directly into the output mixers. The signal gain into each mixer can be adjusted at the mixer inputs using control register 12h. In slot mode (XSLE = 1), the AUXDAC also supports variable sample rates (See "Variable Rate Audio" section). When the auxiliary DAC is not used, it can be powered down by setting AXE = 0. This is also the default setting. REGISTER ADDRESS 64h AUDAC Input Control BIT 15 LABEL XSLE DEFAULT 0 DESCRIPTION AUXDAC input selection 0: from AUXDACVAL (for DC signals) 1: from AC-Link slot selected by AUXDACSLT (for AC signals) AUXDAC Input Selection 000 - Slot 5, bits 8-19 (with XSLE=1) 001 - Slot 6, bits 8-19 (with XSLE=1) 010 - Slot 7, bits 8-19 (with XSLE=1) 011 - Slot 8, bits 8-19 (with XSLE=1) 100 - Slot 9, bits 8-19 (with XSLE=1) 101 - Slot 10, bits 8-19 (with XSLE=1) 110 - Slot 11, bits 8-19 (with XSLE=1) 111 - RESERVED (do not use) AUXDAC Digital Input (with XSLE=0) 000h: minimum FFFh: full-scale Mute AUXDAC path to headphone mixer 1: Mute, 0: No mute (ON) AUXDAC to headphone mixer gain 000: +6dB ... (3dB steps) 111: -15dB Mute AUXDAC path to speaker mixer 1: Mute, 0: No mute (ON) AUXDAC to speaker mixer gain 000: +6dB ... (3dB steps) 111: -15dB Mute AUXDAC path to phone mixer 1: Mute, 0: No mute (ON) AUXDAC to phone mixer gain 000: +6dB ... (3dB steps) 111: -15dB 0: AUXDAC off 1: AUXDAC enabled
AUXILIARY DAC
14:12
AUXDAC SLT
000
11:0
AUXDAC VAL A2H
000h
12h AUXDAC Output Control
15
1
14:12
A2HVOL
010 (0dB)
11 10:8
A2S A2SVOL
1 010 (0dB)
7 6:4
A2P A2PVOL
1 010 (0dB)
0 Table 14 AUXDAC Control
AXE
0
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WM9711L ANALOGUE AUDIO OUTPUTS
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The following sections give an overview of the analogue audio output pins. For more information on recommended external components, please refer to the "Applications Information" section.
HEADPHONE OUTPUTS - HPOUTL AND HPOUTR
The HPOUTL and HPOUTR (pins 39 and 41) are designed to drive a 16 or 32 headphone or a line output. They can also be used as line-out pins. The output signal is produced by the headphone mixer. The signal volume on HPOUTL and HPOUTR can be independently adjusted under software control by writing to register 04h. When HPOUTL and HPOUTR are not used, the output drivers can be disabled to save power (see "Power Management" section). Both pins remain at the same DC level (the reference voltage VREF) when they are disabled, so that no click noise is produced. REGISTER ADDRESS 04h HPOUTL / HPOUTR Volume BIT 15 LABEL MUTE DEFAULT 1 DESCRIPTION Mute HPOUTL and HPOUTR 1: Mute (OFF) 0: No Mute (ON) HPOUTL Volume 000000: 0dB (maximum) 000001: -1.5dB ... (1.5dB steps) 011111: -46.5dB 1xxxxx: -46.5dB Zero Cross Enable 0: Change gain immediately 1: Change gain only on zero crossings, or after time-out HPOUTR Volume Similar to HPOUTLVOL
13:8
HPOUTLVOL
000000 (0dB)
7
ZC
0
5:0
HPOUTRVOL
00000 (0dB)
Table 15 HPOUTL / HPOUTR Control
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WM9711L
Pin 37 (OUT3) has a buffer that can drive load impedances down to 16. It can be used to: * Drive an ear speaker (phone receiver). The speaker can be connected differentially between OUT3 and HPOUTL, or in single-ended configuration (OUT3 to HPGND). The ear speaker output is produced by the headphone mixer. The right signal must be inverted (OUT3INV = 1), so that the left and right channel are mixed to mono in the speaker [L-(-R) = L+R]. Eliminate the DC blocking capacitors on HPOUTL and HPOUTR. In this configuration, OUT3 produces a buffered midrail voltage (AVDD/2) and is connected to the headphone socket's ground pin (see "Applications Information") Produce the inverse of the MONOOUT signal, for a differential mono output.
EAR SPEAKER OUTPUT - OUT3
*
*
Note: OUT3 can only handle one of the above functions at any given time. REGISTER ADDRESS 16h OUT3 Control BIT 15 LABEL MUTE DEFAULT 1 DESCRIPTION Mute OUT3 1: Mute (Buffer OFF) 0: No Mute (Buffer ON) Source of OUT3 signal 00 01 10 inverse of HPOUTR (for BTL ear speaker) VREF (for capless headphone drive) mono mix of both headphone channels (for single-ended ear speaker) inverse of MONOOUT (for differential mono output)
10:9
OUT3 SRC
00
11 7 ZC 0
Zero Cross Enable 0: Change gain immediately 1: Change gain only on zero crossings, or after time-out OUT3 Volume 000000: 0dB (maximum) 000001: -1.5dB ... (1.5dB steps) 011111: -46.5dB 1xxxxx: -46.5dB
5:0
OUT3 VOL
000000 (0dB)
Table 16 OUT3 Control
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WM9711L
LOUDSPEAKER OUTPUTS - LOUT2 AND ROUT2
Production Data
The LOUT2 and ROUT2 outputs are designed to differentially drive an 8 mono speaker. They can also be used as a stereo line-out or headphone output. For speaker drive, the LOUT2 signal must be inverted (INV = 1), so that the left and right channel are added up in the speaker [R-(-L) = R+L]. REGISTER ADDRESS 02h LOUT2/ROUT2 Volume BIT 15 LABEL MUTE DEFAULT 1 DESCRIPTION Mute LOUT2 and ROUT2 1: Mute (OFF) 0: No Mute (ON) LOUT2 Volume 000000: 0dB (maximum) 000001: -1.5dB ... (1.5dB steps) 011111: -46.5dB 1xxxxx: -46.5dB Zero Cross Enable 0: Change gain immediately 1: Change gain only on zero crossings, or after time-out LOUT2 Invert 0 = No Inversion (0 phase shift) 1 = Signal inverted (180 phase shift) ROUT2 Volume Similar to LOUT2VOL Source of LOUT2/ROUT2 signals 0: speaker mixer (for BTL speaker) 1: headphone mixer (for stereo output)
13:8
LOUT2VOL
00000 (0dB)
7
ZC
0
6
INV
0
5:0 16h 8
ROUT2VOL SRC
00000 (0dB) 0
Table 17 LOUT2 / ROUT2 Control Note: 1. For BTL speaker drive, it is recommended that LOUT2VOL = ROUT2VOL.
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Production Data
WM9711L
The MONOOUT output (pin 33) is intended for connection to the TX side of a wireless chipset. The signal is generated in a dedicated mono mixer; it is not necessarily a mono mix of the stereo outputs HPOUTL/R or LOUT2/ROUT2 (see "Audio Mixers" section). The MONOOUT volume can be controlled by writing to register 06h. When MONOOUT is not used, the output buffer can be disabled to save power (see "Power Management" section). The MONOOUT pin remains at the same DC level (the reference voltage on the VREF pin), so that no click noise is produced when muting or un-muting. REGISTER ADDRESS 06h MONOOUT Volume BIT 15 LABEL MUTE DEFAULT 1 DESCRIPTION Mute MONOOUT 1: Mute 0: No Mute Zero Cross Enable 0: Change gain immediately 1: Change gain only on zero crossings, or after time-out MONOOUT Volume 00000: 0dB (maximum) 00001: -1.5dB ... (1.5dB steps) 11111: -46.5dB
PHONE OUTPUT (MONOOUT)
7
ZC
0
4:0
MONOOUT VOL
00000 (0dB)
Table 18 MONOOUT Control
THERMAL CUTOUT
The speaker and headphone outputs can drive very large currents. To protect the WM9711L from becoming too hot, a thermal cutout has been built in. If the chip temperature reaches approximately 150C, and the ENT bit is set, the WM9711L deasserts GPIO bit 11 in register 54h, a virtual GPIO that can be set up to generate an interrupt to the CPU (see "GPIO and Interrupt Control" section). REGISTER ADDRESS 5Ch BIT 2 LABEL ENT DEFAULT 0 DESCRIPTION Enable thermal cutout 0: Disabled 1: Enabled Thermal cutout (virtual GPIO) 1: Temperature below 150C 0: Temperature above 150C See also "GPIO and Interrupt Control" section.
54h
11
TI
1
Table 19 Thermal Cutout Control
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WM9711L
JACK INSERTION AND AUTO-SWITCHING
Production Data
In a phone application, a BTL ear speaker may be connected across OUT3 and HPOUTL, and a stereo headphone on HPOUTL and HPOUTR. Typically, only one of these two output devices is used at any given time: when no headphone is plugged in, the BTL ear speaker is active, otherwise the headphone is used. The presence of a headphone can be detected using GPIO1 (pin 44) and an external pull-up resistor (see "Applications Information" section for a circuit diagram). When the jack is inserted GPIO1 is pulled low by a switch on the socket. When the jack is removed GPIO1 is pulled high by a resistor. If the JIEN bit is set, the WM9711L automatically switches between headphone and ear speaker, as shown below. REGISTER ADDRESS 58h Additional Functional Control BIT 12 11 LABEL JIEN FRC DEFAULT 0 0 DESCRIPTION Jack Insert Enable - Takes output of GPIO1 logic Force Ear Speaker Mode See table below
Table 20 Jack Insertion / Auto-Switching (1)
0
0
X
Set by reg. 04h
Jack insert detection disabled (headphone and ear speaker can be used at the same time) Jack insert detection enabled, headphone plugged in Jack insert detection enabled, headphone not plugged in Force Ear Speaker Mode Invalid; do not use this setting
Set by reg. 24h and 26h Disabled
1
0
0
1
X
1
0 1
1 1
X X
Set by reg. 24h and 26h
Set by reg. 16h
Table 21 Jack Insertion / Auto-Switching (2)
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Set by reg. 24h and 26h
Set by reg. 04h
Set by reg. 16h
HPOUTL/ HPOUTR STATE
HPOUTL VOLUME
HPOUTR VOLUME
OUT3 VOLUME
OUT3 STATE
JIEN
FRC GPIO1
MODE DESCRIPTION
Production Data
WM9711L
The WM9711L supports the SPDIF standard using pin 47 as its output. Note that pin 47 can also be used as a GPIO pin. The GE5 bit (register 56h, bit 5) selects between GPIO and SPDIF functionality (see "GPIO and Interrupt control" section). Register 3Ah is a read/write register that controls SPDIF functionality and manages bit fields propagated as channel status (or sub-frame in the V case). With the exception of V, this register should only be written to when the SPDIF transmitter is disabled (SPDIF bit in register 2Ah is `0'). Once the desired values have been written to this register, the contents should be read back to ensure that the sample rate in particular is supported, then SPDIF validity bit SPCV in register 2Ah should be read to ensure the desired configuration is valid. Only then should the SPDIF enable bit in register 2Ah be set. This ensures that control and status information start up correctly at the beginning of SPDIF transmission. REGISTER ADDRESS 2Ah Extended Audio BIT 10 5:4 LABEL SPCV SPSA DEFAULT 0 00 DESCRIPTION SPDIF validity bit (read-only) SPDIF slot assignment (ADCO = 0) 00: Slots 3, 4 01: Slots 6, 9 10: Slots 7, 8 11: Slots 10, 11 SPDIF output enable 1 = enabled, 0 = disabled Validity bit; `0' indicates frame valid, `1' indicates frame not valid Double rate SPDIF support; not supported by WM9705 therefore fixed `0' SPDIF sample rate; WM9705 supports only 48kHz = `10'. This value is fixed. Generation level; programmed as required by user Category code; programmed as required by user Pre-emphasis; `0' indicates not preemphasis, `1' indicates 50/15us preemphasis Copyright; `0' indicates copyright is not asserted, `1' indicates copyright Non-audio; `0' indicates data is PCM, `1' indicates non-PCM format (eg DD or DTS) Professional; `0' indicates consumer, `1' indicates professional Source of SPDIF data 0: SPDIF data comes from SDATAOUT (pin 5), slot selected by SPSA 1: SPDIF data comes from audio ADC
DIGITAL AUDIO (SPDIF) OUTPUT
2 3Ah SPDIF Control Register 15 14 13:1 2 11 10:4 3
SEN V DRS SPSR L CC PRE
0 0 0 10 0 0000000 0
2 1
COPY AUDIB
0 TBD
0 5Ch Additional Function Control 4
PRO ADCO
TBD 0
Table 22 SPDIF Output Control
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WM9711L
AUDIO MIXERS
MIXER OVERVIEW
Production Data
The WM9711L has three separate low-power audio mixers to cover all audio functions required by smartphones, PDAs and handheld computers. The diagram below shows the routing of the analogue audio signals into the mixers. The numbers at the mixer inputs refer to the control register bits that control the volume and muting for that particular signal.
0Eh [7] MICL MICR
DIFF / STEREO/ MONO (Reg 20h)
0Eh [12:8,4:0]
0/20 dB
LINE_IN PCBEEP PHONE_IN
10h [12:8,4:0]
0Eh [14,13] 18h [13] 1Ah [13:11] 10h [13] 12h [7:4] 0Ah [7:4]
OUT3VOL (Reg 16h)
PHONE MIX
OUT3SRC (Reg 16h) VREF MONOOUT
MONOOUT (PHONE TX)
0Ch [4:0] 0Ch [15] 10h [15] 14h [11:7] 18h [15] 14h [15:12] 0Ah [15:12] 12h [15:12]
M U X
OUT3 ear speaker HPOUTL HPOUTR
HPVOL (Reg 04h)
STEREO
18h [12:8,4:0]
DAC
HEAD PHONE/ EAR SPEAKER MIX
PHONE MIX
HEADPHONE MIX
M RECORD U X SELECT
1Ch / ALC
INV (Reg 02h)
Stereo headphone / headset LOUT2 loud speaker
BACK SPKR MIX AUX DAC
(12-BIT)
0/20 dB
10h [14] 18h [14] 12h [11:8] 0Ah [11:8] 0Ch [14]
STEREO
-1
BACK SPEAKER MIX
M U X
SRC (Reg 16h) OUT2VOL (Reg 02h)
ROUT2
1Ah [14]
ADC
Figure 4 Audio Mixer Overview
HEADPHONE MIXER
The headphone mixer drives the HPOUTL and HPOUTR outputs. It also drives OUT3, if this pin is connected to an ear speaker (phone receiver). The following signals can be mixed into the headphone path: * * * * * * * PHONE (controlled by register 0Ch, see "Audio Inputs") LINE_IN (controlled by register 10h, see "Audio Inputs") the output of the Record PGA (see "Audio ADC", "Record Gain") the stereo DAC signal (controlled by register 18h, see "Audio DACs") the MIC signal (controlled by register 0Eh, see "Audio Inputs") PC_BEEP (controlled by register 0Ah, see "Audio Inputs") the AUXDAC signal (controlled by register 12h, see "Auxiliary DAC")
In a typical smartphone application, the headphone signal is a mix of PHONE and sidetone (for phone calls) and the stereo DAC signal (for music playback).
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Production Data
WM9711L
SPEAKER MIXER
The speaker mixer drives the LOUT2 and ROUT2 output. The following signals can be mixed into the speaker path: * * * * * PHONE (controlled by register 0Ch, see "Audio Inputs") LINE_IN (controlled by register 10h, see "Audio Inputs") the stereo DAC signal (controlled by register 18h, see "Audio DACs") PC_BEEP (controlled by register 0Ah, see "Audio Inputs") the AUXDAC signal (controlled by register 12h, see "Auxiliary DAC")
In a typical smartphone application, the speaker signal is a mix of AUXDAC (for system alerts or ring tone playback), PHONE (for speakerphone function), and PC_BEEP (for externally generated ring tones).
MONO MIXER
The mono mixer drives the MONOOUT pin. The following signals can be mixed into MONOOUT: * * * * * * LINE_IN (controlled by register 10h, see "Audio Inputs") the output of the Record PGA (see "Audio ADC", "Record Gain") the stereo DAC signal (controlled by register 18h, see "Audio DACs") the MIC signal (controlled by register 10h, see "Audio Inputs") PC_BEEP (controlled by register 0Ah, see "Audio Inputs") the AUXDAC signal (controlled by register 12h, see "Auxiliary DAC")
In a typical smartphone application, the MONOOUT signal is a mix of the amplified microphone signal (possibly with Automatic Gain Control) and (if enabled) an audio playback signal from the stereo DAC or the auxiliary DAC.
SIDE TONE CONTROL
The side tone path is into the headphone mixer and is either from the MIC or ALC path (with no 20dB boost) REGISTER ADDRESS 14h Sidetone Control 15 BIT LABEL STM DEFAULT 1 DESCRIPTION MIC side tone select 0: selected 1 : not selected (path muted) MIC Sidetone volume 000 : +6dB (max.) 001: +3dB ... (3dB steps) 111 : -15dB (min.) ALC side tone select 11: mute 10: mono - left 01: mono - right 00: stereo ALC Sidetone volume Similar to STVOL
14:12
STVOL
010 (0dB)
11:10
ALCM
11
9:7 Table 23 Side Tone Control
ALCVOL
010 (0dB)
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WM9711L VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION
Production Data
By using an AC'97 Rev2.2 compliant audio interface, the WM9711L can record and playback at all commonly used audio sample rates, and offer full split-rate support (i.e. the DAC, ADC and AUXDAC sample rates are completely independent of each other - any combination is possible). The default sample rate is 48kHz. If the VRA bit (register 20h) is set and the appropriate block is enabled, then other sample rates can be selected by writing to registers 2Ch, 32h and 2Eh. The ACLink continues to run at 48k frames per second irrespective of the sample rate selected. However, if the sample rate is less than 48kHz, then some frames do not carry an audio sample. REGISTER ADDRESS 2Ah Extended Audio Stat/Ctrl 2Ch Audio DAC Sample Rate 0 BIT LABEL VRA DEFAULT 0 (OFF) DESCRIPTION Variable Rate Audio 0: OFF (DAC and ADC run at 48kHz) 1: ON (sample rates determined by registers 2Ch, 2Eh and 32h) Audio DAC sample rate 1F40h: 8kHz 2B11h: 11.025kHz 2EE0h: 12kHz 3E80h: 16kHz 5622h: 22.05kHz 5DC0h: 24kHz 7D00h: 32kHz AC44h: 44.1kHz BB80h: 48kHz Any other value defaults to the nearest supported sample rate Audio ADC sample rate similar to DACSR AUXDAC sample rate similar to DACSR
15:0
DACSR
BB80h (48kHz)
32h Audio ADC Sample Rate 2Eh AUXDAC Sample Rate
15:0
ADCSR
BB80h (48kHz) BB80h (48kHz)
15:0
AUXDA CSR
Table 24 Audio Sample Rate Control
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Production Data
WM9711L
BATTERY ALARM
PRINCIPLE OF OPERATION
The WM9711L has two on-chip comparators that can be used to implement a battery alarm function, or other functions such as a window comparator. Each comparator has one of its inputs tied to any one of three device pins and the other tied to a voltage reference. The voltage reference can be either internally generated (VREF = AVDD/2) or externally connected on CREF (pin 12). The comparator output signals are passed to the GPIO logic block (see "GPIO and Interrupt Control" section), where they can be used to send an interrupt to the CPU via the AC-Link or via the IRQ pin, and / or to wake up the WM9711L from sleep mode. COMP1 (pin 29) corresponds to GPIO bit 15 and COMP2 (pin30) to bit 14. REGISTER ADDRESS 4Eh BIT 15 LABEL CP1 DEFAULT 1 DESCRIPTION COMP1 Polarity (see also "GPIO and Interrupt Control") 0: Alarm when COMP1 voltage is above VREF 1: Alarm when COMP1 voltage is below VREF COMP2 Polarity (see also "GPIO and Interrupt Control") 0: Alarm when COMP2 voltage is above VREF 1: Alarm when COMP2 voltage is below VREF Low Battery Alarm Delay 000: No delay 001: 0.17s (213 = 8192 AC-Link frames) 010: 0.34s (214 = 16384 AC-Link frames) 011: 0.68s (215 = 32768 AC-Link frames) 100: 1.4s (216 = 65536 AC-Link frames) 101: 2.7s (217 = 131072 AC-Link frames) 110: 5.5s (218 = 262144 AC-Link frames) 111: 10.9s (219 = 524288 AC-Link frames)
14
CP2
1
58h
15:13
COMP2 DEL
0
Table 25 Comparator Control
REGISTER ADDRESS 5Ch Additional Analogue Functions
BIT 14
LABEL C1REF
DEFAULT 0
DESCRIPTION Comparator 1 Reference Voltage 0 1 VREF = AVDD/2 WIPER/AUX4 (pin 12) AVDD/2 when C1REF='1'. Otherwise comparator 1 is powered down COMP1/AUX1 (pin 29) COMP2/AUX2 (pin 30) BMON/AUX3 (pin 31) VREF = AVDD/2 WIPER/AUX4 (pin 12) AVDD/2 when C2REF='1'. Otherwise comparator 2 is powered down COMP1/AUX1 (pin 29) COMP2/AUX2 (pin 30) BMON/AUX3 (pin 31)
13:12
C1SRC
00
Comparator 1 Signal Source 00 01 10 11
11
C2REF
0
Comparator 2 Reference Voltage 0 1
10:9
C2SRC
00
Comparator 2 Signal Source 00 01 10 11
Table 26 Comparator Reference and Source Control
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WM9711L
COMP2 DELAY FUNCTION
Production Data
COMP2 has an optional delay function for use when the input signal is noisy. When COMP2 triggers and the delay is enabled (i.e. COMP2DEL is non-zero), then GPIO bit 14 does not change state immediately, and no interrupt is generated. Instead, the WM9711L starts a delay timer and checks COMP2 again after the delay time has passed. If COMP2 is still active, then the GPIO bit is set and an interrupt may be generated (depending on the state of the GW14 bit). If COMP2 is no longer active, the GPIO bit is not set, i.e. all register bits are as if COMP2 had never triggered. Note: If COMP2 triggers while the WM9711L is in sleep mode, and the delay is enabled, then the device starts the on-chip crystal oscillator in order to count the time delay.
COMP2 TRIGGERS
C2W?
0
END
1
COMP2 DEL?
non-zero
START TIMER
WAIT time=COMP2DEL 000 SHUT DOWN TIMER
COMP2?
Inactive
END [FALSE ALARM]
Active
SET GI14
END
Figure 5 COMP2 Delay Flow Chart
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Production Data
WM9711L
VOLTAGE REGULATOR
AVDD, DCVDD, ...
WM9711L IALARM R1 COMP1
+ DEAD BAT
C VBATT R2
+
VREF
LOW BAT
GPIO / INTERRUPT LOGIC
COMP2 R3
GPIO2/ IRQ
GPIO PINS
Figure 6 Battery Alarm Example Schematic The typical schematic for a dual threshold battery alarm is shown above. This alarm has two thresholds, "dead battery" (COMP1) and "low battery" (COMP2). R1, R2 and R3 set the threshold voltages. Their values can be up to about 1M in order to keep the battery current [IALARM = VBATT / (R1+R2+R3)] to a minimum (higher resistor values may affect the accuracy of the system as leakage currents into the input pins become significant). * Dead battery alarm: COMP1 triggers when VBATT < VREF x (R1+R2+R3) / (R2+R3)
A dead battery alarm is the highest priority of interrupt in the system. It should immediately save all unsaved data and shut down the system. The GP15, GS15 and GW15 bits must be set to generate this interrupt. * Low battery alarm: COMP2 triggers when VBATT < VREF x (R1+R2+R3) / R3
A low battery alarm has a lower priority than a dead battery alarm. Since the threshold voltage is higher than for a dead battery alarm, there is enough power left in the battery to give the user a warning and/or shut down "gracefully". When VBATT gets close to the low battery threshold, spurious alarms are filtered out by the COMP2 delay function. The purpose of the capacitor C is to remove from the comparator inputs any high frequency noise or glitches that may be present on the battery (for example, noise generated by a charge pump). It forms a low pass filter with R1, R2 and R3. * Low pass cutoff fc [Hz] = 1/ (2 C x (R1 || (R2+R3)))
Provided that the cutoff frequency is several orders of magnitude lower than the noise frequency fn, this simple circuit can achieve excellent noise rejection. * Noise rejection [dB] = 20 log (fn / fc)
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WM9711L GPIO AND INTERRUPT CONTROL
Production Data
The WM9711L has five GPIO pins that operate as defined in the AC'97 Revision 2.2 specification. Each GPIO pin can be set up as an input or as an output, and has corresponding bits in register 54h and in slot 12. The state of a GPIO output is determined by sending data through slot 12 of outgoing frames (SDATAOUT). Data can be returned from a GPIO input by reading the register bit, or examining slot 12 of incoming frames (SDATAIN). GPIO inputs can be made sticky, and can be programmed to generate and interrupt, transmitted either through the AC-Link or through a dedicated, level-mode interrupt pin (GPIO2/IRQ, pin 45). GPIO pins 2 to 5 are multi-purpose pins that can also be used for other (non-GPIO) purposes, e.g. as a SPDIF output or to signal pen-down. This is controlled by register 56h. Independently of the GPIO pins, the WM9711L also has three virtual GPIOs. These are signals from inside the WM9711L, which are treated as if they were GPIO input signals. From a software perspective, virtual GPIOs are the same as GPIO pins, but they cannot be set up as outputs, and are not tied to an actual pin. This allows for simple, uniform processing of different types of signals that may generate interrupts (e.g. pen down, battery warnings, jack insertion, high-temperature warning, or GPIO signals).
Figure 7 GPIO logic
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Production Data
WM9711L
GPIO BIT 1 2 3 4 5 SLOT1 2 BIT 5 6 7 8 9 TYPE GPIO Pin GPIO Pin GPIO Pin GPIO Pin GPIO Pin PIN NO. 44 45 46 47 48 GPIO1 GPIO2 / IRQ enabled only when pin not used as IRQ GPIO3 GPIO4 GPIO5 / SPDIF_OUT enabled only when pin not used as SPDIF_OUT GPIO Logic not implemented for these bits DESCRIPTION
6-10 11
N/A 15
Unused Virtual GPIO Unused Virtual GPIO Virtual GPIO
-
Internal thermal cutout signal, indicates when [Thermal Cutout] internal temperature reaches approximately 150C (see "Thermal Sensor") [COMP2] [COMP1] GPIO Logic not implemented for these bits Internal COMP2 output (Low Battery Alarm) enabled only when COMP2 is on Internal COMP1 output (Dead Battery Alarm) enabled only when COMP1 is on
12-13 14 15
N/A 18 19
Table 27 GPIO Bits and Pins
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WM9711L
REGISTER ADDRESS 4Ch BIT n LABEL GCn DEFAULT 1 DESCRIPTION
Production Data The properties of the GPIOs are controlled through registers 4Ch to 52h, as shown below.
GPIO Pin Configuration 0: Output 1: Input GC11-15 are always `1' Unused bits GC6-GC10 are always `0' GPIO Pin Polarity / Type 0: Active Low 1: Active High [GIn = pin level XNOR GPn) Unused bits GP6-GP10, GP12 and GP13 are always `1'
4Eh
n
GPn
1
50h
n
GSn
0
GPIO Pin Sticky 1: Sticky 0: Not Sticky Unused bits GS6-GS10, GS12 and GS13 are always `0' GPIO Pin Wake-up 1: Wake Up (generate interrupts from this pin) 0: No wake-up (no interrupts generated) Unused bits GW6-GW10, GW12 and GW13 are always `0' GPIO Pin Status Read: Returns status of each GPIO pin Write: Sets output pin high or low. (Writing `0' clears sticky bit) Unused bits GI6-GI10, GI12 and GI13 are always `0'
52h
n
GWn
0
54h
n
GIn
N/A
Table 28 GPIO Control The following procedure is recommended for handling interrupts: When the controller receives an interrupt, check register 54h. For each GPIO bit in descending order of priority, check if the bit is `1'. If yes, execute corresponding interrupt routine, then write `0' to corresponding bit in 54h. If no, continue to next lower priority GPIO. After all GPIOs have been checked, check if interrupt still present or no. If yes, repeat procedure. If no, then jump back to process that ran before the interrupt. If the system CPU cannot execute such an interrupt routine, it may be preferable to switch internal signals (such as PENDOWN) directly onto the GPIO pins. However, in this case the interrupt signals cannot be made sticky, and more GPIO pins are tied up both on the WM9711L and on the CPU. REGISTER ADDRESS 56h GPIO pins function select BIT 2 LABEL GE2 DEFAULT 1 DESCRIPTION GPIO2 / IRQ output select 0: Pin 45 disconnected from GPIO logic set 4Ch, bit 2 to `0' to output IRQ signal 1: Pin 45 connected to GPIO logic (IRQ disabled) GPIO5 / SPDIF output select 0: Pin 48 = SPDIF (disconnected from GPIO logic) set 4Ch, bit 5 to `0' to output SPDIF signal 1: Pin 48 connected to GPIO logic (SPDIF disabled)
5
GE5
1
Table 29 Using GPIO Pins for Non-GPIO Functions
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Production Data
WM9711L
REGISTER ADDRESS 58h Additional Functional Control BIT 0 LABEL IRQ INV DEFAULT 0 DESCRIPTION Inverts the IRQ signal (pin 45) 0: IRQ signal not inverted 1: IRQ signal inverted Enables GPIO wake-up 0: Disabled 1: Enabled
1
WAKEEN
0
Table 30 Additional Functionality for GPIO Pins
POWER MANAGEMENT
The WM9711L includes the standard power down control register defined by the AC'97 specification (register 26h). Additionally, it also allows more specific control over the individual blocks of the device through register 24h. Each particular circuit block is ON when both the relevant bit in register 26h and the relevant bit in register 24h are set to `0'. REGISTER ADDRESS BIT LABEL DEFAULT NORMAL PIN 47 `HI' DURING RESET 1 (OFF) 1 (OFF) 1 (OFF) 1 (OFF) 1 (OFF) 1 (OFF) 1 (OFF) 0 0 0 0 Disables HPOUTL, HPOUTR and OUT3 Buffer Disables internal clock Disables AC-link interface (external clock off) Disables VREF, analogue mixers and outputs Disables analogue mixers, LOUT2, ROUT2 (but not VREF) Disables stereo DAC Disables audio ADCs and input Mux Read-only bit, indicates VREF is ready (inverse of PR2) Read-only bit, indicates analogue mixers are ready (inverse of PR3) Read-only bit, indicates audio DACs are ready (inverse of PR1) Read-only bit, indicates audio ADCs are ready (inverse of PR0) DESCRIPTION
26h Powerdown/ Status register
14 13 12 11 10 9 8 3 2 1 0
PR6 PR5 PR4 PR3 PR2 PR1 PR0 REF ANL DAC ADC
0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 1 1 1 1
Table 31 Powerdown and Status Register (Conforms to AC'97 Rev 2.2) As can be seen from the table above, most blocks are `ON' by default. However, if pin 47 (GPIO4/ADA/MASK) is held high during reset, the WM9711L starts up with all blocks powered down by default, saving power. This is achieved by connecting a pull-up resistor (e.g. 100k) from pin 47 to DBVDD. Note that the state of pin 47 during reset only affects register 26h.
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WM9711L
REGISTER ADDRESS 24h Additional power down control BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 LABEL PD15 PD14 PD13 PD12 PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0 DEFAULT 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) 0 (ON) DESCRIPTION Disables Crystal Oscillator Disables left audio DAC Disables right audio DAC Disables left audio ADC Disables right audio ADC Disables MICBIAS Disables left headphone mixer Disables right headphone mixer Disables speaker mixer
Production Data
Disables MONO_OUT buffer (pin 33) and phone mixer Disables OUT3 buffer (pin 37) Disables headphone buffers (HPOUTL/R) Disables speaker outputs (LOUT2, ROUT2) Disables Line Input PGA (left and right) * Disables Phone Input PGA * Disables Mic Input PGA (left and right) *
Note: When analogue inputs or outputs are disabled, they are internally connected to VREF through a large resistor (VREF=AVDD/2 except in OFF mode, when VREF itself is disabled). This maintains the potential at that node and helps to eliminate pops when the pins are re-enabled. Table 32 Extended Power Down Register (Additional to AC'97 Rev 2.2) Note: *When disabling a PGA, always ensure that it is muted first.
ADDITIONAL POWER MANAGEMENT:
* AUXDAC: see "Auxiliary DAC" section. AUXDAC is OFF by default.
SLEEP MODE
Whenever the PR4 bit (reg. 26h) is set, the AC-Link interface is disabled, and the WM9711L is in sleep mode. There is in fact a very large number of different sleep modes, depending on the other control bits. For example, the low-power standby mode described below is a sleep mode. It is desirable to use sleep modes whenever possible, as this will save power. The following functions do not require a clock and can therefore operate in sleep mode: * * * Analogue-to-analogue audio (DACs and ADCs unused), e.g. phone call mode GPIO and interrupts Battery alarm / analogue comparators
The WM9711L can awake from sleep mode as a result of * * * A warm reset on the AC-Link (according to the AC'97 specification) A signal on a GPIO pin (if the pin is configured as an input, with wake-up enabled - see "GPIO and Interrupt Control" section) A virtual GPIO event such as battery alarm, thermal sensor, etc. (see "GPIO and Interrupt Control" section)
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Production Data
WM9711L
LOW POWER STANDBY MODE
If all the bits in registers 26h and 24h are set, then the WM9711L is in low-power standby mode and consumes very little current. A 1M resistor string remains connected across AVDD to generate VREF. This is necessary if the on-chip analogue comparators are used (see "Battery Alarm" section), and helps shorten the delay between wake-up and playback readiness. If VREF is not required, the 1M resistor string can be disabled by setting the SVD bit, reducing current consumption further. REGISTER ADDRESS 58h BIT 10 LABEL SVD DEFAULT 0 DESCRIPTION VREF Disable 0: VREF enabled using 1M string (low-power standby mode) 1 : VREF disabled, 1M string disconnected (OFF mode)
Table 33 Disabling VREF (for lowest possible power consumption)
SAVING POWER AT LOW SUPPLY VOLTAGES
The analogue supplies to the WM9711L can run from 1.8V to 3.6V. By default, all analogue circuitry on the IC is optimized to run at 3.3V. This set-up is also good for all other supply voltages down to 1.8V. However, at lower voltages, it is possible to save power by reducing the internal bias currents used in the analogue circuitry. This is controlled as shown below. REGISTER ADDRESS 5Ch BIT 6:5 LABEL V[1:0] DEFAULT 11 DESCRIPTION Analogue Bias optimization 11 : Lowest bias current, optimized for 1.8V 10 : Low bias current, optimized for 2.5V 01, 00 : Default bias current, optimized for 3.3V
Table 34 Analogue Bias Selection
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WM9711L AC97 DATA AND CONTROL INTERFACE
INTERFACE PROTOCOL
Production Data
The WM9711Lhas a single AC'97 interface for both data transfer and control. The AC-Link uses 5 wires: * * * SDATAIN (pin 8) carries data from the WM9711L to the controller SDATAOUT (pin 5) carries data from the controller to the WM9711L BITCLK (pin 6) is a clock, normally generated by the WM9711L crystal oscillator and supplied to the controller. However, BITCLK can also be passed to the WM9711L from an off-chip generator. SYNC is a synchronization signal generated by the controller and passed to the WM9711L RESETB resets the WM9711L to its default state
* *
AC-LINK CONTROLLER e.g. CPU SYNC BITCLK SDATAIN SDATAOUT RESETB 24.576MHz XTAL WM9711L ANALOGUE INPUTS / OUTPUTS
Figure 8 AC-Link Interface (typical case with BITCLK generated by the AC97 codec) The SDATAIN and SDATAOUT signals each carry 13 time-division multiplexed dat a streams (slots 0 to 12). A complete sequence of slots 0 to 12 is referred to as an AC-Link frame, and contains a total of 256 bits. The frame rate is 48kHz. This makes it possible to simultaneously transmit and receive multiple data streams (e.g. audio in, audio out, AUXDAC, GPIO, control) at sample rates up to 48kHz. Detailed information can be found in the AC'97 (Revision 2.2) specification, which can be obtained at www.intel.com/labs/media/audio/ Note: SDATAOUT and SYNC must be held low for when RESETB is applied. These signals must be held low for the entire duration of the RESETB pulse and especially during the low-to-high transition of RESETB. If either is set high during reset the AC'97 device may enter test modes. Information relating to this operation is available in the AC'97 specification or in Wolfson applications note WAN0104 available at www.wolfsonmirco.com.
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Production Data
WM9711L
INTERFACE TIMING
Test Characteristics: DBVDD = 3.3V, DCVDD = 3.3V, DGND1 = DGND2 = 0V, TA = -25C to +85C, unless otherwise stated.
CLOCK SPECIFICATIONS
tCLK_HIGH BITCLK tCLK_PERIOD tSYNC_HIGH SYNC tSYNC_PERIOD tSYNC_LOW tCLK_LOW
Figure 9 Clock Specifications (50pF External Load) PARAMETER BITCLK frequency BITCLK period BITCLK output jitter BITCLK high pulse width (Note 1) BITCLK low pulse width (Note 1) SYNC frequency SYNC period SYNC high pulse width SYNC low pulse width Note: 1. Worst case duty cycle restricted to 45/55 tSYNC_PERIOD tSYNC_HIGH tSYNC_LOW tCLK_HIGH tCLK_LOW 36 36 40.7 40.7 48 20.8 1.3 19.5 tCLK_PERIOD SYMBOL MIN TYP 12.288 81.4 750 45 45 MAX UNIT MHz ns ps ns ns kHz s s s
DATA SETUP AND HOLD
Figure 10 Data Setup and Hold (50pF External Load) Note: 1. Setup and hold times for SDATAIN are with respect to the AC'97 controller, not the WM9711L.
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WM9711L
PARAMETER Setup to falling edge of BITCLK Hold from falling edge of BITCLK Output valid delay from rising edge of BITCLK SYMBOL tSETUP tHOLD tCO MIN 10 10 TYP
Production Data
MAX
UNIT ns ns
15
ns
SIGNAL RISE AND FALL TIMES
triseCLK BITCLK triseSYNC SYNC triseDIN SDATAIN triseDOUT SDATAOUT tfallDOUT tfallDIN tfallSYNC tfallCLK
Figure 11 Signal Rise and Fall Times (50pF External Load) PARAMETER SDATAOUT rise time SDATAOUT fall time SYNC rise time SYNC fall time BITCLK rise time BITCLK fall time SDATAIN rise time SDATAIN fall time SYMBOL triseDOUT tfallDOUT triseSYNC tfallSYNC triseCLK tfallCLK triseDIN tfallDIN 2 2 2 2 MIN TYP MAX 6 6 6 6 6 6 6 6 UNIT ns ns ns ns ns ns ns ns
Incoming signals (from the AC'97 controller to the WM9711L)
Outgoing signals (from the WM9711L to the AC'97 controller)
AC-LINK POWERDOWN
SLOT 1 SYNC
SLOT 2
BITCLK
SDATAOUT
WRITE TO 0X20
DATA PR4
DON'T CARE
tS2_PDOWN SDATAIN
Figure 12 AC-Link Powerdown Timing
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Production Data
WM9711L
AC-Link powerdown occurs when PR4 (register 26h, bit 12) is set (see "Power Management" section). PARAMETER End of Slot 2 to BITCLK and SDATAIN low SYMBOL tS2_PDOWN MIN TYP MAX 1.0 UNIT s
COLD RESET (ASYNCHRONOUS, RESETS REGISTER SETTINGS)
tRST_LOW RESETB
tRST2CLK
BITCLK
Figure 13 Cold Reset Timing Note: For correct operation SDATAOUT and SYNC must be held LOW for entire RESETB active low period otherwise the device may enter test mode. See AC'97 specification or Wolfson applications note WAN104 for more details.
PARAMETER RESETB active low pulse width RESETB inactive to BITCLK startup delay
SYMBOL tRST_LOW tRST2CLK
MIN 1.0 162.8
TYP
MAX
UNIT s ns
WARM RESET (ASYNCHRONOUS, PRESERVES REGISTER SETTINGS)
Figure 14 Warm Reset Timing
PARAMETER SYNC active high pulse width SYNC inactive to BITCLK startup delay
SYMBOL tSYNC_HIGH tRST2CLK
MIN 162.4
TYP 1.3
MAX
UNIT s ns
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WM9711L
Production Data
REGISTER MAP
Note: Highlighted bits differ from the AC'97 specification (newly added for non-AC'97 function, or same bit used in a different way, or for another function)
Reg
00h 02h 04h 06h 08h 0Ah 0Ch 0Eh 10h 12h 14h 16h 18h 1Ah 1Ch 20h 22h 24h 26h Reset LOUT2/ROUT2 Volume Headphone Volume MONOOUT Volume DAC Tone Control PCBEEP Input PHONE Volume MIC Volume LINEIN Volume AUXDAC Volume / Routing Sidetone Volume OUT3 Volume DAC Volume Record Select Record Gain General Purpose DAC 3D Control Powerdown Powerdown Ctrl/Stat
Name
15
0 MU MU MU BB B2H P2H 0 L2H A2H STM MU D2H 0 RMU 0 0 PD15 EAPD
14
SE4 0 0 0 0
13
SE3
12
SE2
11
SE1
10
SE0
9
ID9
8
ID8
7
ID7 ZC ZC
6
ID6 INV 0 0 DAT
5
ID5
4
ID4
3
ID3
2
ID2
1
ID1
0
ID0
Default
6174h 8000h 8000h 8000h 0F0Fh
LOUT2 Volume HPOUTL Volume 0 0 B2HVOL 0 BC B2S 0 0 0 0 0 BASS B2SVOL 0 0 0 0
ROUT2 Volume HPOUTR Volume 0 0 B2PVOL TC 0 0 MONOOUT Volume TRBL 0 0
ZC 0 B2P 0 20dB 0 A2P
AAA0h C008h 6808h E808h
P2S M12P L2S
0 M22P L2P A2HVOL STVOL
0 MS 0
0
PHONEIN Volume MICVOL (Mono /Right)
LMICVOL (Left Only) LINEINLVOL A2S ALCM 0 0 OUT3SRC A2SVOL ALCVOL SRC
0 A2PVOL 0 0 0
LINEINRVOL 0 0 0 0 AXE 0
AAA0h AD00h 8000h E808h 3000h 8000h
0 ZC 0 0 ZC 0 0 0 GRR 0 0 PD6 0
0
0 D2S BOOST GRL 0 0 PD14 PR6
0 D2P R2P
OUT3 Volume 0 0 0 Right DAC Volume 0 RECSR RECVOLR 0 0 0 0
Left DAC Volume R2P BST 0 0 PD12 PR4 0 0 PD11 PR3 0 0 PD10 PR2 RECSL RECVOLL 0 0 PD9 PR1 0 0 PD8 PR0
(Extended) 3DE 0 PD13 PR5
(Extended) 0 3DLC PD5 0 0 3DUC PD4 0 PD3 REF
LB 0 PD7 0
0000h 0000h
3DDEPTH PD2 ANL PD1 DAC PD0 ADC
0000h
Default for reg. 26h - pin 47 "low" Default for reg. 26h - pin 47 "high" during reset (recommended for lowest power) 28h 2Ah 2Ch 2Eh 32h 3Ah 4Ch 4Eh 50h 52h 54h 56h 58h 5Ah 5Ch 5Eh 60h 62h 64h Extended Audio ID Ext'd Audio stst/ctrl Audio DACs Sample Rate AUXDAC Sample Rate Audio ADCs Sample Rate SPDIF control GPIO Pin Configuration GPIO Pin Polarity / Type GPIO Pin Sticky GPIO Pin Wake-Up GPIO Pin Status GPIO Pin Assignment GPIO pin sharing / Additional Functions Vendor Reserved Add. Function Control Vendor Reserved ALC Control ALC / Noise Gate Control AUXDAC input control ALCL (target level) ALCSEL XSLE MAXGAIN AUXDACSLT V 1 C1P C1S C1W C1I COM1 DRS 1 C2P C2S C2W C2I COM2 1 1 0 0 0 1 SPSR 1 1 0 0 0 1 JIEN L 1 TP TS TW TI TCO JIF 0 1 0 0 0 0 SVD 0 1 0 0 0 0 0 ID1 0 ID0 0 0 0 0 0 REV1 0 REV0 SPCV AMAP 0 LDAC 0 SDAC 0 CDAC 0 0 SPSA 0 VRM 0 SPDIF SEN DRA 0 VRA VRA
000Fh FFF0h 0405h 0410h BB80h BB80h BB80h PRE GC5 GP5 GS5 GW5 GI5 GE5 0 GC4 GP4 GS4 GW4 GI4 1 0 GC3 GP3 GS3 GW3 GI3 1 COPY AUD IB PRO GC2 GP2 GS2 GW2 GI2 GE2 GC1 GP1 GS1 GW1 GI1 1 WAKE EN 0 1 0 0 0 0 IRQ INV 2000h F83Eh FFFFh 0000h 0000h GPIO pins F83Eh 0008h
DACSR (Audio DACs Sample Rate) AUXDACSR (Auxiliary DAC Sample Rate) ADCSR (Audio ADCs Sample Rate) CC (Category Code) 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0
COMP2DEL
Die Revision
RESERVED FOR TEST
AMUTE C1 REF
C2SRC
C2 REF
C2SRC
DS
AM EN
V (BIAS)
AD CO
HPF
ENT
ASS
0000h
RESERVED FOR TEST HLD (hold time) ZC TIMEOUT ALC ZC NG AT DCY (decay time) 0 NGG ATK (attack time) NGTH (threshold) B032h 3E00h 0000h N/A 574Dh 4C12h
AUXDAC VAL RESERVED. DO NOT WRITE TO THESE REGISTERS
66h- Vendor Reserved 7Ah 7Ch Vendor ID1 7Eh Vendor ID2
ASCII character "W" ASCII character "L"
ASCII character "M" Number "12"
Table 35 WM9711L Register Map
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Production Data
WM9711L
REGISTER BITS BY ADDRESS
Register 00h is a read-only register. Writing any value to this register resets all registers to their default, but does not change the contents of reg. 00h. Reading the register reveals information about the codec to the driver, as required by the AC'97 Specification, Revision 2.2 REG ADDR 00h BIT 14:10 9:6 5 4 3 2 1 0 LABEL SE [4:0] ID9:6 ID5 ID4 ID3 ID2 ID1 ID0 DEFAULT 11000 0101 1 1 0 1 0 0 DESCRIPTION Indicates a codec from Wolfson Microelectronics Indicates 18 bits resolution for ADCs and DACs Indicates that the WM9711L supports bass boost Indicates that the WM9711L has a headphone output Indicates that the WM9711L does not support simulated stereo Indicates that the WM9711L supports bass and treble control Indicates that the WM9711L does not support modem functions Indicates that the WM9711L does not have a dedicated microphone ADC REFER TO Intel's AC'97 Component Specification, Revision 2.2, page 50
Register 02h controls the output pins LOUT2 and ROUT2. REG ADDR 02h BIT 15 13:8 7 6 5:0 MU LOUT2 VOL ZC INV ROUT2 VOL LABEL DEFAULT 1 (mute) 000000 (0dB) 0 (OFF) 0 (not inverted) 000000 (0dB) DESCRIPTION Mutes LOUT2 and ROUT2. LOUT2 volume Enables zero-cross detector Inverts LOUT2 (for BTL speaker operation) ROUT2 volume REFER TO Analogue Audio Outputs
Register 04h controls the headphone output pins, HPOUTL and HPOUTR. REG ADDR 04h BIT 15 13:8 7 5:0 MU HPOUTL VOL ZC HPOUTR VOL LABEL DEFAULT 1 (mute) 000000 (0dB) 0 (OFF) 000000 (0dB) DESCRIPTION Mutes HPOUTL and HPOUTR. HPOUTL volume Enables zero-cross detector HPOUTR volume REFER TO Analogue Audio Outputs
Register 06h controls the analogue output pin MONOOUT. REG ADDR 06h 7 5:0 BIT 15 MU ZC MONOOUT VOL LABEL DEFAULT 1 (mute) 0 (OFF) 000000 (0dB) Mutes MONOOUT. Enables zero-cross detector MONOOUT volume DESCRIPTION REFER TO Analogue Audio Outputs
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Register 08h controls the bass and treble response of the left and right audio DAC (but not AUXDAC). REG ADDR 08h BIT 15 12 11:8 6 4 3:0 BB BC BASS DAT TC TRBL LABEL DEFAULT 0 (linear) 0 (low) 1111 (OFF) 0 (OFF) 0 (high) 1111 (OFF) DESCRIPTION Selects linear bass control or adaptive bass boost Selects bass cut-off frequency Controls bass intensity Enables 6dB pre-DAC attenuation Selects treble cut-off frequency Controls treble intensity
Production Data
REFER TO Audio DACs, Tone Control / Bass Boost
Register 0Ah controls the analogue input pin PCBEEP. REG ADDR 0Ah BIT 15 14:12 11 10:8 7 6:4 LABEL B2H B2HVOL B2S B2SVOL B2P B2PVOL DEFAULT 1 (mute) 010 (0dB) 1 (mute) 010 (0dB) 1 (mute) 010 (0dB) DESCRIPTION Mutes PCBEEP to headphone mixer path Controls gain of PCBEEP to headphone mixer path Mutes PCBEEP to speaker mixer path Controls gain of PCBEEP to speaker mixer path Mutes PCBEEP to phone mixer path Controls gain of PCBEEP to phone mixer path REFER TO Analogue Inputs, PCBEEP Input
Register 0Ch controls the analogue input pin PHONE. REG ADDR 0Ch BIT 15 14 4:0 LABEL P2H P2S PHONEVOL DEFAULT 1 (mute) 1 (mute) 01000 (0dB) DESCRIPTION Mutes PHONE to headphone mixer path Mutes PHONE to speaker mixer path Controls PHONE input gain to all mixers (but not to ADC) REFER TO Analogue Inputs, PHONE Input
Register 0Eh controls the analogue input pins MIC1 and MIC2. REG ADDR 0Eh BIT 14 13 12:8 7 6:5 4:0 LABEL M12P M22P LMICVOL 20dB MS MICVOL DEFAULT 1 (mute) 1 (mute) 01000 (0dB) 0 (OFF) 00 (MIC1 only) 01000 (0dB) DESCRIPTION Mutes MIC1 to phone mixer path Mutes MIC2 to phone mixer path Controls volume of MIC1 (left), in stereo mode only Enables 20dB gain boost Selects microphone mode. 00=MIC1 only, 01=differential, 10=MIC2 only, 11=stereo Controls mic volume (except MIC1 in stereo mode) REFER TO Analogue Inputs, Microphone Input
Register 10h controls the analogue input pins LINEINL and LINEINR. REG ADDR 10h BIT 15 14 13 12:8 4:0 LABEL L2H L2S L2P LINEINLVOL LINEINRVOL DEFAULT 1 (mute) 1 (mute) 1 (mute) 01000 (0dB) 01000 (0dB) DESCRIPTION Mutes LINEIN to headphone mixer path Mutes LINEIN to speaker mixer path Mutes LINEIN to phone mixer path Controls LINEINL input gain to all mixers (but not to ADC) Controls LINEINR input gain to all mixers (but not to ADC) REFER TO Analogue Inputs, Line Input
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Production Data Register 12h controls the output signal of the auxiliary DAC. REG ADDR 12h BIT 15 14:12 11 10:8 7 6:4 0 LABEL A2H A2HVOL A2S A2SVOL A2P A2PVOL AXE DEFAULT 1 (mute) 010 (0dB) 1 (mute) 010 (0dB) 1 (mute) 010 (0dB) 0 (0FF) DESCRIPTION Mutes AUXDAC to headphone mixer path Controls gain of AUXDAC to headphone mixer path Mutes AUXDAC to speaker mixer path Controls gain of AUXDAC to speaker mixer path Mutes AUXDAC to phone mixer path Controls gain of AUXDAC to phone mixer path Enables AUXDAC
WM9711L
REFER TO Auxiliary DAC
Register 14h controls the side tone paths. REG ADDR 14h BIT 15 14:12 11:10 9:7 LABEL STM STVOL ALCM ALCVOL DEFAULT 1 (mute) 010 (0dB) 11 (mute both) 010 (0dB) DESCRIPTION Mutes microphone to headphone mixer path Controls gain of microphone to headphone mixer path Selects ALC to headphone mixer path. 00=stereo, 01=right only, 10=left only, 11=mute both left and right Controls gain of ALC to headphone mixer path REFER TO Audio Mixers, Side Tone Control
Register 16h controls the analogue output pin OUT3, and also contains one control bit that affects LOUT2 and ROUT2. REG ADDR 16h BIT 15 10:9 8 7 5:0 MU OUT3SRC SRC ZC OUT3VOL LABEL DEFAULT 1 (mute) 00 (-HPOUTL) 0 (spkr mix) 0 (disabled) 000000 (0dB) Mutes OUT3. Selects source of OUT3 signal. 00=-HPOUTL, 01=VREF, 10=HPOUTL+HPOUTR, 11=-MONOOUT Selects source of LOUT2 and ROUT2 signals. 0=from speaker mixer, 1=from headphone mixer Zero-cross enable OUT3 volume DESCRIPTION REFER TO Analogue Audio Outputs
Register 18h controls the audio DACs (but not AUXDAC). REG ADDR 18h BIT 15 14 13 12:8 4:0 LABEL D2H D2S D2P LDACVOL RDACVOL DEFAULT 1 (mute) 1 (mute) 1 (mute) 01000 (0dB) 01000 (0dB) DESCRIPTION Mutes DAC to headphone mixer path Mutes DAC to speaker mixer path Mutes DAC to phone mixer path Controls left DAC input gain to all mixers Controls right DAC input gain to all mixers REFER TO Audio DACs
Register 1Ah controls the record selector and the ADC to phone mixer path. REG ADDR 1Ah BIT 14 13:12 11 10:8 2:0 LABEL BOOST R2P R2PBST RECSL RECSR DEFAULT 0 (OFF) 11 (mute) 0 (OFF) 000 (mic) 000 (mic) DESCRIPTION Enables 20dB gain boost for recording Controls ADC to phone mixer path. 00=stereo, 01=left ADC only, 10=right ADC only, 11=mute left and right Enables 20dB gain boost for ADC to phone mixer path Selects left ADC signal source Selects right ADC signal source REFER TO Audio ADC, Record Selector
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Register 1Ch controls the recording gain. REG ADDR 1Ch BIT 15 14 13:8 7 6 5:0 LABEL RMU GRL RECVOLL ZC GRR RECVOLR DEFAULT 1 (mute) 0 (standard) 000000 (0dB) 0 (OFF) 0 (standard) 000000 (0dB) DESCRIPTION Mutes audio ADC input Selects gain range for PGA of left ADC. 0=0...+22.5dB in 1.5dB steps, 1=-17.25...+30dB in 0.75dB steps Controls left ADC recording volume Enables zero-cross detector Selects gain range for PGA of left ADC. 0=0...+22.5dB in 1.5dB steps, 1=-17.25...+30dB in 0.75dB steps Controls right ADC recording volume
Production Data
REFER TO Audio ADC, Record Gain
Register 20h is a "general purpose" register as defined by the AC'97 specification. Only two bits are implemented in the WM9711L. REG ADDR 20h BIT 13 7 LABEL 3DE LB DEFAULT 0 (OFF) 0 (OFF) DESCRIPTION Enables 3D enhancement Enables loopback (i.e. feed ADC output data directly into DAC) REFER TO Audio DACs, 3D Stereo Enhancement Intel's AC'97 Component Specification, Revision 2.2, page 55
Register 22h controls 3D stereo enhancement for the audio DACs. REG ADDR 22h 5 4 3:0 BIT LABEL 3DLC 3DUC 3DDEPTH DEFAULT 0 (low) 0 (high) 0000 (0%) DESCRIPTION Selects lower cut-off frequency Selects upper cut-off frequency Controls depth of 3D effect REFER TO Audio DACs, 3D Stereo Enhancement
Register 24h is for power management additional to the AC'97 specification. Note that the actual state of each circuit block depends on both register 24h AND register 26h. REG ADDR 24h BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 LABEL PD15 PD14 PD13 PD12 PD11 PD10 PD9 PD8 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0 DEFAULT 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* Disables Crystal Oscillator Disables left audio DAC Disables right audio DAC Disables left audio ADC Disables right audio ADC Disables MICBIAS Disables left headphone mixer Disables right headphone mixer Disables speaker mixer Disables MONO_OUT buffer (pin 33) and phone mixer Disables OUT3 buffer (pin 37) Disables headphone buffers (HPOUTL/R) Disables speaker outputs (LOUT2, ROUT2) Disables Line Input PGA (left and right) Disables Phone Input PGA Disables Mic Input PGA (left and right) DESCRIPTION REFER TO Power Management
* "0" corresponds to "ON", if and only if the corresponding bit in register 26h is also 0.
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Production Data
WM9711L
Register 26h is for power management according to the AC'97 specification. Note that the actual state of many circuit blocks depends on both register 24h AND register 26h. REG ADDR 26h BIT 14 13 12 11 10 9 8 3 2 1 0 LABEL PR6 PR5 PR4 PR3 PR2 PR1 PR0 REF ANL DAC ADC inverse of PR2 inverse of PR3 inverse of PR1 inverse of PR0 DEFAULT see note DESCRIPTION Disables HPOUTL, HPOUTR and OUT3 Buffer Disables Internal Clock Disables AC-link interface (external clock off) Disables VREF, analogue mixers and outputs Disables analogue mixers, LOUT2, ROUT2 (but not VREF) Disables Stereo DAC and AUXDAC Disables audio ADCs and input Mux Read-only bit, Indicates VREF is ready Read-only bit, indicates analogue mixers are ready Read-only bit, indicates audio DACs are ready Read-only bit, indicates audio ADCs are ready REFER TO Power Management
Note: PR6 to PR0 default to 1 if pin 47 is held high during reset, otherwise they default to 0. Register 28h is a read-only register that indicates to the driver which advanced AC'97 features the WM9711L supports. REG ADDR 28h BIT 15:14 11:10 9 8 7 6 3 2 1 0 LABEL ID REV AMAP LDAC SDAC CDAC VRM SPDIF DRA VRA DEFAULT 00 01 0 0 0 0 0 1 0 1 DESCRIPTION Indicates that the WM9711L is configured as the primary codec in the system. Indicates that the WM9711L conforms to AC'97 Rev2.2 Indicates that the WM9711L does not support slot mapping Indicates that the WM9711L does not have an LFE DAC Indicates that the WM9711L does not have Surround DACs Indicates that the WM9711L does not have a Centre DAC Indicates that the WM9711L does not have a dedicated, variable rate microphone ADC Indicates that the WM9711L supports SPDIF output Indicates that the WM9711L does not support double rate audio Indicates that the WM9711L supports variable rate audio REFER TO Intel's AC'97 Component Specification, Revision 2.2, page 59
Register 2Ah controls the SPDIF output and variable rate audio. REG ADDR 2Ah BIT 10 5:4 2 0 LABEL SPCV SPSA SEN VRA DEFAULT 1 (valid) 01 (slots 6, 9) 0 (OFF) 0 (OFF) DESCRIPTION SPDIF validity bit (read-only) Controls SPDIF slot assignment. 00=slots 3 and 4, 01=6/9, 10=7/8, 11=10/11 Enables SPDIF output enable Enables variable rate audio REFER TO Digital Audio (SPDIF) Output
Registers 2Ch, 2Eh 32h and control the sample rates for the stereo DAC, auxiliary DAC and audio ADC, respectively. REG ADDR 2Ch 2Eh 32h BIT all all all LABEL DACSR AUXDACSR ADCSR DEFAULT BB80h BB80h BB80h DESCRIPTION Controls stereo DAC sample rate Controls auxiliary DAC sample rate Controls audio ADC sample rate REFER TO Variable Rate Audio / Sample Rate Conversion
Note: The VRA bit in register 2Ah must be set first to obtain sample rates other than 48kHz
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Register 3Ah controls the SPDIF output. REG ADDR 3Ah BIT 15 14 13:12 11 10:4 3 2 1 0 V DRS SPSR L CC PRE COPY AUDIB PRO LABEL 0 0 10 0 0000000 0 0 0 0 DEFAULT DESCRIPTION Validity bit; `0' indicates frame valid, `1' indicates frame not valid Indicates that the WM9711L does not support double rate SPDIF output (read-only) Indicates that the WM9711L only supports 48kHz sampling on the SPDIF output (read-only) Generation level; programmed as required by user Category code; programmed as required by user Pre-emphasis; `0' indicates no pre-emphasis, `1' indicates 50/15us pre-emphasis Copyright; `0' indicates copyright is not asserted, `1' indicates copyright Non-audio; `0' indicates data is PCM, `1' indicates nonPCM format (e.g. DD or DTS) Professional; `0' indicates consumer, `1' indicates professional
Production Data
REFER TO Digital Audio (SPDIF) Output
Register 4Ch to 54h control the GPIO pins and virtual GPIO signals. REG ADDR 4Ch BIT LABEL DEFAULT all 1 (all inputs) except unused bits all 1 all 0 (not sticky) all 0 (OFF) please refer to the register map = status of GPIO inputs DESCRIPTION Controls GPIO configuration as inputs or as outputs (note: virtual GPIOs can only be inputs) Controls GPIO polarity (actual polarity depends on register 4Ch AND register 4Eh) Makes GPIO signals sticky Enables wake-up for each GPIO signal GPIO pin status (read from inputs, write `0' to clear sticky bits) Controls Comparator 1 signal (virtual GPIO) Controls Comparator 2 signal (virtual GPIO) Unused Controls Thermal sensor signal (virtual GPIO) Unused Controls GPIO5 (pin 48) Controls GPIO4 (pin 47) Controls GPIO3 (pin 46) Controls GPIO2 (pin 45) Controls GPIO1 (pin 44) REFER TO GPIO and Interrupt Control
4Eh 50h 52h 54h 15 14 13-12 11 10-6 5 4 3 2 1
Register 56h controls the use of GPIO pins for non-GPIO functions. REG ADDR 56h 5 2 BIT LABEL GE5 GE2 DEFAULT 1 (GPIO) 1 (GPIO) DESCRIPTION Selects between GPIO5 and SPDIF_OUT function for pin 48 Selects between GPIO2 and IRQ function for pin 45 REFER TO GPIO and Interrupt Control
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Production Data Register 58h controls several additional functions. REG ADDR 58h BIT 15:13 12 11 10 3:2 1 0 LABEL COMP2DEL JIEN FRC SVD DIE REV WAKEEN IRQ INV DEFAULT 000 (no delay) 0 0 0 (enabled) DESCRIPTION Selects Comparator 2 delay Enables Jack Insert Detection Forces Jack Insert Detection Disables VREF for lowest possible power consumption Enables GPIO wake-up Inverts the IRQ signal (pin 45)
WM9711L
REFER TO Battery Alarm Analogue Audio Outputs, Jack Insertion and Auto-Switching Power Management N/A GPIO and Interrupt Control
Indicates device revision. 10=Rev.C 0 (no wake-up) 0 (not inverted)
Register 5Ch controls several additional functions. REG ADDR 5Ch BIT 15 14 13:12 11 10:9 8 7 6:5 4 3 2 1:0 LABEL AMUTE C1REF C1SRC C2REF C2SRC DS AMEN VBIAS ADCO HPF ENT ASS DEFAULT 0 0 (AVDD/2) 00 (OFF) 0 (AVDD/2) 00 (OFF) 0 0 (OFF) 00 0 0 0 00 DESCRIPTION Read-only bit to indicate DAC auto-muting Selects Comparator 1 Reference Voltage Selects Comparator 1 Signal Source Selects Comparator 1 Reference Voltage Selects Comparator 1 Signal Source Selects differential microphone input pins. 0=MIC1 and MIC2, 1=LINEL and LINER Enables DAC Auto-Mute Selects analogue bias for lowest power, depending on AVDD supply. 0X=3.3V, 10=2.5V, 11=1.8V Selects source of SPDIF data. 0=from SDATAOUT, 1= from audio ADC Disables ADC high-pass filter Enables thermal sensor Selects time slots for stereo ADC data. 00=slots 3 and 4, 01=7/8, 10=6/9, 11=10/11 Power Management Digital Audio (SPDIF) Output Audio ADC Analogue Audio Outputs, Thermal Sensor Audio ADC, ADC Slot Mapping Analogue Inputs, Microphone Input REFER TO Audio DACs, Stereo DACs Battery Alarm
Registers 60h and 62h control the ALC and Noise Gate functions. REG ADDR 60h BIT 15:12 11:8 7:4 3:0 62h 15:14 13:11 10:9 8 7 5 4:0 LABEL ALCL HLD DCY ATK ALCSEL MAXGAIN ZC TIMEOUT ALCZC NGAT NGG NGTH DEFAULT 1011 (-12dB) 0000 (0 ms) 0011 (192 ms) 0010 (24 ms) 00 (OFF) 111 (+30dB) 11 (slowest) 0 (OFF) 0 (OFF) 0 (hold gain) 00000 (-76.5dB) DESCRIPTION Controls ALC threshold Controls ALC hold time Controls ALC decay time Controls ALC attack time Controls which channel ALC operates on. 00=none, 01=right only, 10=left only, 11=both Controls upper gain limit for ALC Controls time-out for zero-cross detection Enables zero-cross detection for ALC Enables noise gate function Selects noise gate type. 0=hold gain, 1=mute Controls noise gate threshold REFER TO Audio ADC, Automatic Level Control
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Register 64h controls the input signal of the auxiliary DAC. REG ADDR 64h BIT 15 14:12 11:0 LABEL XSLE AUXDACSLT AUXDACVAL DEFAULT 0 000 (Slot 5) 000000000 DESCRIPTION Selects input for AUXDAC. 0=from AUXDACVAL (for DC signals), 1=from AC-Link slot (for AC signals) Selects input slot for AUXDAC (with XSLE=1) AUXDAC Digital Input for AUXDAC (with XSLE=0). 000h= minimum, FFFh=full-scale
Production Data
REFER TO Auxiliary DAC
Register 7Ch and 7Eh are read-only registers that indicate the identity of the device to the driver. REG ADDR 7Ch 7Eh BIT 15:8 7:0 15:8 7:0 LABEL F7:0 S7:0 T7:0 REV7:0 DEFAULT 57h 4Dh 4Ch 12h DESCRIPTION ASCII character "W" for Wolfson ASCII character "M" ASCII character "L" Number 12 REFER TO Intel's AC'97 Component Specification, Revision 2.2, page 50
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WM9711L
APPLICATIONS INFORMATION
RECOMMENDED EXTERNAL COMPONENTS
Figure 15 External Components Diagram
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WM9711L
RECOMMENDED EXTERNAL COMPONENT VALUES
COMPONENT REFERENCE C1 - C6 C7 - C8 C9 C10 C11 C12 C13 C14 C27 and C28 C15 - C20 C21 - C23 C24 - C26 R1 R2 XT SUGGESTED VALUE 100nF 10uF 100nF 10uF 100nF 10uF 100nF 10uF 22pF 1uF 2.2uF 220F 100k 100k 24.576MHz DESCRIPTION De-coupling for DBVDD,DCVDD,TPVDD,AVDD,SPKVDD,HPVDD
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Reservoir capacitor for DVDD, AVDD. Should the supplies use separate sources then additional capacitors will be required of each additional source. De-coupling for CAP2. Reservoir capacitor for CAP2 De-coupling for VREF Reservoir capacitor for VREF De-coupling for MICBIAS - Not required if MICBIAS output is not used Reservoir capacitor for MICBIAS - Not required if MICBIAS output is not used Required when used with a parallel resonant crystal. AC coupling capacitors Output AC coupling capacitors to remove VREF DC level from outputs Output AC coupling capacitors to remove VREF DC level from outputs. Pull-up resistor, ensures that all circuit blocks are OFF by default Pull down resistor, ensures that all circuit blocks are ON by default AC'97 master clock frequency. A bias resistor is not required but if connected will not affect operation if the value is large (above 1M)
Table 36 External Components Descriptions Note: 1. For Capacitors C7, C8, C10, C12 and C14 it is recommended that very low ESR components are used.
LINE OUTPUT
The headphone outputs, HPOUTL and HPOUTR, can be used as stereo line outputs. The speaker outputs, LOUT2 and ROUT2, can also be used as line outputs, if ROUT2 is not inverted for BTL operation (INV = 0). Recommended external components are shown below.
C1 1uF HPOUTL / LOUT2 HPGND R1 100 Ohm LINE-OUT SOCKET (LEFT)
WM9711L
HPOUTR / ROUT2 C2 1uF R2 100 Ohm
LINE-OUT SOCKET (RIGHT) HPGND
Figure 16 Recommended Circuit for Line Output The DC blocking capacitors and the load resistance together determine the lower cut-off frequency, fc. Assuming a 10 k load and C1, C2 = 10F: fc = 1 / 2 (RL+R1) C1 = 1 / (2 x 10.1k x 1F) = 16 Hz Increasing the capacitance lowers fc, improving the bass response. Smaller values of C1 and C2 will diminish the bass response. The function of R1 and R2 is to protect the line outputs from damage when used improperly.
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WM9711L
The circuit diagram below shows how to connect a stereo headphone to the WM9711L.
HPOUTL HPOUTR WM9711L HPGND = 0V C2 220uF C1 220uF
AC-COUPLED HEADPHONE OUTPUT
Figure 17 Simple Headphone Output Circuit Diagram The DC blocking capacitors C1 and C2 together with the load resistance determine the lower cut-off frequency, fc. Increasing the capacitance lowers fc, improving the bass response. Smaller capacitance values will diminish the bass response. For example, with a 16 load and C1 = 220F: fc = 1 / 2 RLC1 = 1 / (2 x 16 x 220F) = 45 Hz
DC COUPLED (CAPLESS) HEADPHONE OUTPUT
In the interest of saving board space and cost, it may be desirable to eliminate the 220F DC blocking capacitors. This can be achieved by using OUT3 as a headphone pseudo-ground, as shown below.
HPOUTL
WM9711L HPOUTR OUT3 = AVDD/2
Figure 18 Capless Headphone Output Circuit Diagram (OUT3SRC = 10) As the OUT3 pin produces a DC voltage of AVDD/2, there is no DC offset between HPOUTL/HPOUTR and OUT3, and therefore no DC blocking capacitors are required. However, this configuration has some drawbacks: * * The power consumption of the WM9711L is increased, due to the additional power consumed in the OUT3 output buffer. If the DC coupled output is connected to the line-in of a grounded piece of equipment, then OUT3 becomes short-circuited. Although the built-in short circuit protection will prevent any damage to the WM9711L, the audio signal will not be transmitted properly. OUT3 cannot be used for another purpose
*
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BTL SPEAKER OUTPUT
LOUT2 and ROUT2 can differentially drive a mono 8 speaker as shown below.
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LOUT2
WM9711L
INV = 1 -1
LOUT2VOL
Stereo: VSPKR = L-(-R) = L+R Mono: VSPKR = M-(-M) = 2M
ROUT2VOL
ROUT2
Figure 19 Speaker Output Connection (INV = 1) The right channel is inverted by setting the INV bit, so that the signal across the loudspeaker is the sum of left and right channels.
COMBINED HEADSET / BTL EAR SPEAKER
In smartphone applications with a loudspeaker and separate ear speaker (receiver), a BTL ear speaker can be connected at the OUT3 pin, as shown below.
OUT3 BTL ear speaker HPOUTL WM9711L HPOUTR
HPGND = 0V
Figure 20 Combined Headset / BTL Ear Speaker (OUT3SRC = 00) The ear speaker and the headset play the same signal. Whenever the headset is plugged in, the headphone outputs are enabled and OUT3 disabled. When the headset is not plugged in, OUT3 is enabled (see "Jack Insertion and Auto-Switching").
COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER
Instead of a BTL ear speaker, a single-ended ear speaker can also be used, as shown below.
OUT3 ear speaker (single-ended) HPOUTL WM9711L HPOUTR
HPGND = 0V
Figure 21 Combined Headset / Single-ended Ear Speaker (OUT3SRC = 01)
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WM9711L
The circuit diagram below shows how to detect when a headphone or headset has been plugged into the headphone socket. It generates an interrupt, instructing the controller to enable HPOUTL and HPOUTR and disable OUT3.
JACK INSERT DETECTION
HPOUTR HPOUTL
L R
interrupt logic
GPIO switch closes on insertion
Figure 22 Jack Insert Detection Circuit The circuit requires a headphone socket with a switch that closes on insertion. It detects both headphones and phone headsets. Any GPIO pin can be used, provided that it is configured as an input.
HOOKSWITCH DETECTION
The circuit diagram below shows how to detect when the "hookswitch" of a phone headset is pressed (pressing the hookswitch is equivalent to lifting the receiver in a stationary telephone).
+
+
+
HPOUTR HPOUTL AGND MICL/MICR interrupt logic GPIO MICBIAS
WM9711L
-
L
R
680 - 2.2k
Figure 23 Hookswitch Detection Circuit The circuit uses a GPIO pin as a sense input. The impedance of the microphone and the resistor in the MICBIAS path must be such that the potential at the GPIO pin is above 0.7xDBVDD when the hookswitch is open, and below 0.3xDBVDD when it is closed.
+
MIC
47
HOOK SWITCH
PHONE HEADSET
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WM9711L PACKAGE DRAWING
FL: 48 PIN QFN PLASTIC PACKAGE 7 X 7 X 0.9 mm BODY, 0.50 mm LEAD PITCH
D2 D2/2 37 48 L 36 1 INDEX AREA (D/2 X E/2)
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DM029.E
SEE DETAIL 1
D
EXPOSED GROUND 6 PADDLE
E2/2
E2 SEE DETAIL 2
E
25
12 2X b 2X aaa C aaa C
24 e
13
BOTTOM VIEW
ccc C
TOP VIEW
(A3)
A 0.08 C
C
SEATING PLANE
SIDE VIEW
A1
DETAIL 1
R = 0.3MM
DETAIL 2
1
DETAIL 3
W T (A3) H b Exposed lead G
Datum
Terminal tip e/2
EXPOSED GROUND PADDLE R
e
Half etch tie bar
DETAIL 3
Symbols A A1 A3 b D D2 E E2 e G H L T W aaa bbb ccc REF
Dimensions (mm) NOM MAX 0.90 1.00 0.05 0.02 0.20 REF 0.18 0.25 0.30 7.00 BSC 5.00 5.15 5.25 7.00 BSC 5.00 5.15 5.25 0.5 BSC 0.213 0.1 0.50 0.30 0.4 0.1 0.2 Tolerances of Form and Position 0.15 0.10 0.10 MIN 0.80 0
NOTE
1
JEDEC, MO-220, VARIATION VKKD-2
NOTES: 1. DIMENSION b APPLIED TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.15 mm AND 0.30 mm FROM TERMINAL TIP. 2. ALL DIMENSIONS ARE IN MILLIMETRES 3. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-002. 4. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. 5. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. 6. REFER TO APPLICATION NOTE WAN_0118 FOR FURTHER INFORMATION REGARDING PCB FOOTPRINTS AND QFN PACKAGE SOLDERING.
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WM9711L
IMPORTANT NOTICE
Wolfson Microelectronics plc ("Wolfson") products and services are sold subject to Wolfson's terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement.
Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice. Customers should therefore obtain the latest version of relevant information from Wolfson to verify that the information is current.
Testing and other quality control techniques are utilised to the extent Wolfson deems necessary to support its warranty. Specific testing of all parameters of each device is not necessarily performed unless required by law or regulation.
In order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. Wolfson is not liable for applications assistance or customer product design. The customer is solely responsible for its selection and use of Wolfson products. Wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a Wolfson product.
Wolfson's products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage. Any use of products by the customer for such purposes is at the customer's own risk.
Wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual property right of Wolfson covering or relating to any combination, machine, or process in which its products or services might be or are used. Any provision or publication of any third party's products or services does not constitute Wolfson's approval, licence, warranty or endorsement thereof. Any third party trade marks contained in this document belong to the respective third party owner.
Reproduction of information from Wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. Wolfson is not liable for any unauthorised alteration of such information or for any reliance placed thereon.
Any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in this datasheet or in Wolfson's standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person's own risk. Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person.
ADDRESS:
Wolfson Microelectronics plc 26 Westfield Road Edinburgh EH11 2QB United Kingdom
Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com
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