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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
1.0 Introduction
The AMIS-52150 is a cost-effective, ultra-low power single-chip wireless transceiver. It combines the proven Amplitude Shift Key/On-Off Key (ASK/OOK) modulation technology of the AMIS-52050 with data clock recovery. Based on key features, such as dual independent receive channels, Quick Start crystal oscillator, Sniff ModeTM signal acquisition, and data clock recovery, the AMIS-52150 is ideally suited for a wide range of applications, including point-to-point wireless data links, costoptimized wireless monitor solutions, and very low power remote wireless sensors, among others.
2.0 Key Features
* * * * * * * * * * * * * * * Data clock recovery Auto slicing of data Very low-power single-chip transceiver Minimal external components Low-power RC oscillator Quick Start crystal oscillator Ultra-low power RF Sniff ModeTM, with wake-up on RSSI Internal trim functions reduce external component requirements I2C control interface Serial TX/RX data port Clock generation for an external microprocessor Wake-up on RSSI Antenna diversity dual receiver Internal VCO/PLL tuning varactor Wake-up interrupt to external controller
3.0 Technical Features
* Operating frequency range: o Quick Start, from 350MHz to 448MHz o Non-Quick Start, from 300MHz to 768MHz * TX output power: +12dBm * RX sensitivity: o Sniff Mode: -93dBm minimum o Receive: -117dBm minimum @ 1Kbps, with CDR * Data rate: o 1-8Kbps with Manchester Coding o 1-16Kbps with NRZ data * Power requirements: o Receive: 7.5mA (Continuous) o Transmit: 25mA @ full power (50 percent duty-cycle) o Sniff Mode: 75uA (One percent duty-cycle) o Standby: 500nA (RC oscillator running) * Operating voltage: 2.3V to 3.6V * Modulation: ASK/OOK * Xtal start time: 15us (Quick Start) * Sniff ModeTM polling: 0.5ms to 16s (0.5ms or 64ms steps) * PLL lock time: <50us * Selectable data filter: Up to 20kHz
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
* Internal trim functions: o TX power (-3 to +12dBm) o Antenna impedance matching (Two independent channels) o Xtal, for frequency and Quick Start o RC oscillator frequency o Sniff ModeTM, for data threshold o Data slice * Clock and data recovery (Reduced data jitter) 2 * I C interface: Control bus * Serial interface: Data input/output * Low frequency IF * Internal IF filtering * Package: 20-lead, 209mm SSOP
Data Sheet
4.0 Functional Block Diagram
The AMIS-52150 is a dual-channel receiver and a transmitter in a single, small outline package (Fig. 1). The receiver provides for two independent receive channels with the signals combined in the data detection circuit. Summing the signals allows the two channels to be used for antenna diversity optimization, without the need for complex protocols to select the strongest channel. The AMIS-52150 can be programmed to be a single channel or a dual-channel receiver, respectively. There exist internal trim functions for the RF receiver frequency, for tuning each input port, for setting the internal filters to match the data rate, and for setting the threshold level for acquiring an incoming signal, respectively. The receiver converts the received RF signal to a low frequency IF. An RSSI circuit determines the strength of the received signal. A level detector samples the RSSI signal level and compares that level to the slice threshold to recover the data. The slice threshold can be either set to a fixed level, or alternately, the transceiver can be configured to automatically set the threshold level based on the incoming data. The transmitter is a high efficiency power amplifier (PA) that is turned On or Off by the serial data. The output power level is adjustable. The frequency of the RF output can be tuned with an internal crystal trim function, in order to conform to component and manufacturing tolerances. In addition, the design of the transceiver is based on a number of unique features. The AMIS-52150 can be placed in a very low power state, with the crystal oscillator being Off while the low power RC oscillator maintains the chip operation. In this low power state, the AMIS-52150 remains in the sleep mode until either the wake-up timer or an TM external microcontroller wake up the device, respectively. The receiver can be also configured for operation in Sniff Mode , where by the device is programmed to wake up at regular intervals to sniff for received RF signals, returning to the sleep mode if a signal is not detected. The AMIS-52150 contains a Quick Start circuit as well, which results in full operation of the crystal oscillator in an extremely short time, in turn leading to much lower power consumption as compared to other transceiver products available in the market. In the AMIS-52150, a programmable PLL is used to synchronize the data clock to the received data. This feature enables reducing much of the jitter in the data signal. These functions will be described in more detail later in the document.
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
Figure 1: AMIS-52150 Block Diagram
5.0 Operating and Maximum Specifications
Table 1: Operating Conditions Sym. Parameter VDD Positive supply VSS Ground Temp Temperature range
Min. 2.3 0
Typ. 3 0.0 +25
Max. 3.6 0.1 +50
Units V V o C
Table 2: Absolute Maximum Ratings Sym. Parameter VDD Positive supply RFin Max RF input RX1/RX2 VSS Ground Vin Logical I/P voltage Tstrg Storage temperature
Min.
0.0 -0.3 -40
Max. +4 +10 0.1 VDD+0.3 +120
Units V dBm V V o C
Table 3: Absolute Maximum Ratings Idd (Supply Current) Typ. Max. Transmitting 20 25 Receiving 7.5 10 Sniff Mode 75 Off 500
Units mA mA uA nA
Conditions 50% duty cycle 1% sniff cycle RC OSC Off
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Table 4: Electrical Characteristics; Digital Inputs Parameter Min. Typ. Max. Vih 0.7*VDD Vil 0.3*VDD Iih +1.0 Iil -1.0 2 I C internal pull-up 15 20
Data Sheet
Units V V uA uA K
Table 5: Electrical Characteristics; Digital Outputs Parameter Min. Typ. Max. Voh 0.8*VDD Vol 0.4 Ioh -1.0 Iol +1.0 2 I C internal pull-up 15 20 Table 6: Electrical Characteristics; Analog TX Parameter Min. Typ. Max. Frequency range 402 403.5 405 300 768 350 448 Modulation 1 8 1 16 Max. output power 11 12 13 On/Off ratio 70 VCO gain 75 PLL phase noise -95 -97 Harmonics -35 Crystal freq. spurs -50 Time TX to RX 1
Units V V mA mA K
Units MHz MHz MHz Kbps Kbps dBm dB MHz/V dBc/Hz dBc/Hz dBc dBc ms
Comments Targeted Non-Quick Start Quick Start Manchester-coded data NRZ data Transmit Kvco 10kHz 100kHz With typical matching components 50kHz PLL loop bandwidth
Table 7: Electrical Characteristics; Analog RX Parameter Min. Typ. Max. Frequency range 402 403.5 405 300 768 350 448 Modulation 1 8 1 16 RF input -117 -10 Noise figure 4.5 RF detect time 100 Time RX to TX 1
Units MHz MHz MHz Kbps Kbps dBm us ms
Comments Targeted Non-Quick Start Quick Start Manchester-coded data NRZ data
TM
In Sniff Mode
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
6.0 Pin Definitions
This section describes the pins of the AMIS-52150 package.
Table 8: Pin Description Pin# Name 1 RX1 RF 2 RX2 RF 3 VCO2 4 VCO1 5 LPFILT 6 RSSI/ Bandgap Out 7 NC 8 CREF 9 GND 10 CLKOUT 11 X1 12 X2 13 IIC Data 14 NC 15 IIC Clock 16 TX/RX DATA 17 VDD 18 RFPWR 19 20 RFOUT RF RFGND Type RF RF Ana Ana Ana Ana Comments Receive RF input 1 Receive RF input 2 Voltage controlled oscillator 2 Voltage controlled oscillator 1 Loop filter Analog RSSI output or bandgap output No electrical connection Current bias precision resistor Analog/digital ground RC, XTAL, or data clock output Xtal input Xtal output IIC interface data I/O No electrical connection IIC interface clock Data transmit, data receive or recovered data Positive power supply Regulated voltage Output for RF transmitter circuitry Transmit RF output RF ground
Ana Ana Dig Ana Ana Dig Dig Dig Ana Ana RF Ana
7.0 Package Outline
Figure 2: Package Outline
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Table 9: Package Dimensions ; 209mil SSOP Inches Millimeters Dm Min. Max. Min. Max. A 0.068 0.078 1.73 2.00 A1 0.002 .20 0.05 A2 0.065 0.073 1.65 1.85 b 0.009 0.015 0.22 0.38 D 0.271 0.295 6.90 7.5 E 0.291 0.323 7.40 0.820 E1 0.197 0.221 5.00 0.560 e 0.026 BSC 0.65 BSC
Data Sheet
8.0 Pin Descriptions
8.1 RX1, RX2, RF Input Pins RX1 and RX2 are the RF antenna inputs to the AMIS-52150. The internal circuit designs are identical between these inputs. For the AMIS-52150 receiver inputs, RX1 and RX2, external components are required in order to match the low noise amplifier (LNA) to external devices such as antennas. The external components must provide a DC voltage path to the RF ground. Figure 3 suggests an external circuit for the receiver inputs at 403MHz. Each circuit's input impedance can be trimmed internally to compensate for manufacturing and external component tolerances. The circuits employ an LNA, internal filters, a low frequency, intermediate frequency (IF), and a received signal strength indication (RSSI) circuit to recover the ASK/OOK modulated data. The signals in the two input channels are "summed" before the data recovery circuit. The functions of the receive circuits are controlled by writing to the registers shown in Table 10.
Table 10: Receiver Control Register Description RX1 or RX2 Receiver Register Control Register (HEX) Name Bits 0x00 ANT1 Trim All 0x01 ANT2 Trim All 0x0c ANT1 Enable 0 ANT2 Enable 1
States
0 1 0 1
Comments Inverse relationship register value to internal capacitance Inverse relationship register value to internal capacitance Antenna port is Off Antenna port is On Antenna port is Off Antenna port is On
Figure 3: Typical Input Impedance Match to 50 (402MHz)
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
8.2 VCO1, VCO2, Voltage Controlled Oscillator Pins The VCO1 and VCO2 pins connect a parallel combination of a capacitor and an inductor to the AMIS-52150 internal voltage controlled oscillator (VCO). The external LC (parallel inductor and capacitor) circuit sets the frequency of the internal VCO. The VCO frequency must be set to twice the value of the desired TX or RX frequency. Typical components for the tuning of the VCO at 402MHz are shown in Figure 4. The range of the VCO frequency is from 600MHz to 1536MHz. The voltage on these pins can be used to determine proper operation of the PLL/VCO circuits. For further details, refer to the application note titled "First Time Users Guide to working with the Transceiver IC".
Table 11: VCO Control Registers VCO/PLL Control Registers Register (HEX) Name 0x06 Charge Pump
Bits 0,1
VCO Current
2,3,4
PLL Divider
*Denotes the normal value
7
States 00 01 10 11 000 001 010 011 100 101 110 111 0 1
Comments 20uA 25uA 50uA* 100uA 180uA 220uA 260uA 300uA 340uA* 380uA 420uA 460uA Divider is 64 Divider is 128
Figure 4: Typical Components for VCO Tuning at 402MHz
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
8.3 LPFILT, Loop Filter Pin The LPFILT pin connects the AMIS-52150 internal phase lock loop (PLL) frequency synthesizer to an external loop filter (Fig. 5). An external loop filter allows the system designer to optimize the operation of the AMIS-52150 in order to meet the requirements for a specific end application. For further details, refer to the application note titled "Extending to Frequencies Outside of the 403MHz Target".
Figure 5: Typical Loop Filter
8.4 RSSI/BG, Analog Output Pin The RSSI/BG pin is used to output either the signal from the RSSI circuits, or to output the voltage from the bandgap voltage reference or a bypass capacitor node, respectively. The RSSI output is a true analog representation of the received signal level. The pin can also be programmed to output the voltage of the bandgap voltage reference. When using the AMIS-52150 in the clock and data recovery mode, a capacitor needs to be connected from the RSSI/BG pin to ground. A typical value for this capacitor is 2.2nF. Additional information on the CDR function can be found later in this document. Table 12 presents the registers that control the function of the RSSI/BG pin.
Table 12: RSSVBG Pin Control Registers RSSI Pin Definition Control Registers Register Name Bits (HEX) 0x0e Bandgap on RSSI 3 0x1e RSSI Ext Amp 4
States 0 1 0 1
Comments Normal operation BG output on RSSI* Tri-stated RSSI signal
*Note that device needs to be in RX, TX or crystal-on mode for bandgap voltage to be present on pin.
8.5 CREF, Current Reference Bias Pin A resistor must be connected to the CREF pin to provide a current bias to the internal bandgap voltage reference circuit. It is critical that this resistor value is 33.2K (with one percent or better tolerance) to achieve proper operation of the bandgap voltage reference.
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
8.6 GND, Ground Pin The GND pin is the ground connection for the digital and analog circuits.
8.7 CLKOUT, Internal Clock Output Pin The CLKOUT pin is an output for the RC oscillator, crystal oscillator signal or the recovered data clock, respectively. The crystal oscillator signal output can be divided by 2, 3 or 4. The pin can also be programmed to output the signal from the recovered data clock function. For more information about the clock and data recovery (CDR) function of the AMIS-52150, refer to the section of this document on clock and data recovery. The CLKOUT pin function control registers are shown in Table 13.
Table 13: Oscillator Output Control Registers CLKOUT Pin Definition Control Registers Register (HEX) Name Bits 0x0c CLKOUT enable 7 0x0d CLKOUT select 4,5
0x0e
XTAL divide
0,1
States 0 1 00 01 10 11 00 01 10 11
Comments CLKOUT is enabled CLKOUT is disabled Automatic control RC OSC Xtal Off Divide by 4 Divide by 3 Divide by 2 Divide by 1
8.8 X1, X2, External Crystal Reference Pins X1 and X2 pins connect a parallel resonance oscillator crystal to the AMIS-52150 internal oscillator circuit. The external crystal should meet the requirements as listed in Table 14. However, the two load capacitors should be sized slightly smaller than the recommended value for the crystal, because of the added capacitance due to the internal trim circuit. For further details, refer to the application note titled "Quick Start Crystal Oscillator Circuit Operation and Set-up". The crystal parameters are shown in Table 14.
Table 14: External Crystal Parameters Parameter Min. Typ. Max. Units Conditions Crystal frequency 12.56 12.65 MHz Targeted 9.375 24.0 Non-Quick Start 10.9 14.0 Quick Start Crystal ESR 70 Crystal tolerance 10 ppm Load capacitance Load capacitors should be smaller than recommended for the crystal to allow for frequency tuning
8.9 I2CDATA, I2CCLK, I2C Control Interface Bus Pins The AMIS-52150 implements an I2C serial 8-bit bi-directional interface with the pins I2CDATA and I2CCLK. The device implements the protocol for a slave device. The clock for the interface is generated by the external master device. The interface will support the normal 2 (0 - 100 Kbits/second) or the fast (0 - 400Kbits/second) data modes. The interface conforms to the Phillips specification for the I C bus standard. The pins have internal pull-up resistors. See Table 15 and Table 16 for some parameters of this interface.
2 In addition, Table 17 shows the details of register that controls the I C address increment function.
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Table 15: Internal I C Pull-up Resistors Pin Function 2 I CDATA Internal pull-up R 2 I CCLK Internal pull-up R
2 2
Data Sheet
Typ. 15 15
Units K K
Table 16: I C Bus Device Addressing Device Address (Bin) HEX AMIS-52150 01101000 68 AMIS-52150 01101001 69 Table 17: I C Control Register 2 I C Control Register Register (HEX) Name 2 0x0c I C address increment
2 2
2
Function Device write Device read
Bits 2
States 0 1
Comments Increment after write Do not increment
The I CDATA and I CCLK lines are also used to signal to an external controller certain internal activities of the transceiver. The receiver TM is activated upon detection of RF energy during Sniff Mode operation. The wake-up timer can also be configured to wake-up the device in order to alert an external controller to perform specific tasks, as defined by the system designer.
8.10 TX/RX, Data Input/Output Pin The transmit/receive (TX/RX) pin can be programmed to be either an input for RF transmissions, or an output for RF reception, or the output of the RC oscillator signal, or the output of the recovered data from the CDR circuits, respectively. In transmit mode, this pin is the digital data input to the AMIS-52150 RF transmit circuit. The digital data results in the On and Off cycling of the output power amplifier (PA). The AMIS-52150 does not perform any protocol conversion on the data bit stream; it is simply a serial bit stream. The state of the TX/RX pin either turns the output amplifier On (enabling RF transmission) or turns the output amplifier Off (disabling RF transmission). The TX/RX input can be inverted which causes the state control of the RF output amplifier to be inverted as well. In receive mode, this pin is the digital data output from the AMIS-52150 receivers. The received data is recovered as a high/low (digital ones and zeros) serial bit stream; the AMIS-52150 does not modify the received data protocol. The data output state due to the presence of energy in the receiver can be programmed to be either a high level or a low level at the TX/RX pin. An external controller is needed to decode the information in the recovered data bit stream. When programmed to be an oscillator output, the TX/RX pin outputs the signal from the RC oscillator. This signal can be used to monitor the frequency of the RC oscillator in order to trim the frequency to the desired value. The TX/RX pin can be programmed to output the recovered data obtained from the clock and data recovery circuits. In this case, the device must be programmed in the CDR mode. More information on CDR will be provided in a later section of this datasheet. The functions of the TX/RX port are controlled by the values of the register settings, as shown in Table 18.
Table 18: TX/RX Pin Definition Control Registers Register (HEX) Name Bits 0x0e RC OSC on TX/RX 2 0x1e TX/RX invert 5
States 0 1 0 1
Comments RX/TX normal RC OSC output Normal levels Inverted
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
8.11 VDD, Supply Voltage Pin The VDD pin is the power supply pin for the AMIS-52150. The voltage on this pin is typically 3.0V. Please refer to the section "Operating and Maximum Specifications" of this document for the VDD operating conditions.
Data Sheet
8.12 RFPWR, DC Voltage Output Pin In the AMIS-52150, a regulated DC voltage is generated and outputted at the RFPWR pin. This voltage should be fed through a DC connection to the RFOUT pin in order to power the output stage of the RF PA. The voltage level is adjusted based on the value of the register setting, as shown in Table 19.
Table 19: TX Voltage Control Register RFPWR Voltage Control Register Register (HEX) Name 0x02 RFPWR trim
Bits All
States
Comments 0xff is highest power
8.13 RFOUT, RF Output Signal Pin In the AMIS-52150, a high efficiency non-linear output driver is used to produce the high power RF signal. This driver must be connected through a DC connection to the RFPWR pin. External components are required to match the output to a 50 load, or to an external antenna, respectively. Figure 6 shows a typical matching circuit for the RFOUT pin.
8.14 RFGND, RF Ground Pin The RFGND pin is the ground connection for the RF circuits in the device.
Figure 6: Typical RFOUT Output Impedance Match to 50 (402MHz)
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
9.0 Circuit Functional Description
The functions of the AMIS-52150 are presented in this section. These functions are: * * * * * * * * * * * Receiver Transmitter Sniff Quick Start Data detection Clock and data recovery Application wakeup I2C protocol Registers Alternative wake-up Power-On-Reset/Brown-Out
9.1 Receiver RF signals often suffer from reflections along the path of propagation. These reflected signals arrive at the receiver antenna with different phases or time delays. The different phases of the reflected signals cause the signal strength at the receiver to vary. This variation can be large enough to cause the receiver to miss information. The AMIS-52150 sums the signals from the dual receiver channels within the data detection circuits. This reduces the effect of multi-path reflections. Proper operation requires a) trimming aimed at minimizing the frequency tolerances, b)tuning of the oscillator frequency, c)selection of the data rate filters, and d)setting of a signal threshold, as shown in Table 20. Table 21 lists some characteristic parameters for the receivers. Figure 7 shows a typical received data waveform.
Table 20: Receiver Control Registers RX1 or RX2 Receiver Register Control Register (HEX) Name 0x00 ANT1 trim 0x01 0x05 0x0a 0x0c ANT2 trim RX XTAL tune Data threshold ANT1 enable ANT2 enable RX enable 0x0f Data filter
Bits All All All All 0 1 3 4,5,6
States
Comments Inverse relationship register value to internal capacitance Inverse relationship register value to internal capacitance Reference level for detecting data logic state Antenna port is off Antenna port is on Antenna port is off Antenna port is on Receiver is off Receiver is on 1.1kHz 2.3kHz 5.2kHz 10.4kHz 1.18kHz 2.57kHz 7.0kHz 20.45kHz Normal levels Inverted
0x1e
TX/RX invert
5
0 1 0 1 0 1 000 001 010 011 100 101 110 111 0 1
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Table 21: RF Input Electrical Characteristics Specification Settings Conditions Input resistance Trim 0x00 Min. tune Input capacitance Trim 0xff Max. tune Sensitivity 1 Kbps Frequency Max. input IP3 IP2
Data Sheet
Comments
Typ. 2 3 6 -117 403.5 +8 +66
Max.
-10
Units K pFarads pFarads dBm MHz dBm dBm dBm
w/CDR Target frequency
Figure 7: Received Waveform
9.2 Transmitter The RF transmitter is a non-linear open drain device. It requires a DC signal path to RFPWR, which is the output of the internal power supply to the transmitter. The transmitter is switched On and Off with the serial transmit data stream. To achieve the desired output waveform, a tuned external resonant circuit is required. This resonant circuit should be designed to achieve the desired output frequency. This circuit includes a parallel LC tank (Lp and Cp) tuned to 402MHz (including internal capacitance), as well as a series LC (Ls and Cs) to produce a 403MHz output. The transmitter output is also to be filtered in order to reduce the harmonics to acceptable levels. It is further required that the transmitter output power level is programmed, that the transmit frequency is tuned and that the data rate is selected, respectively (Table 22).
Table 23 lists some characteristic parameters for the transmitter, while a typical transmitter output waveform is shown in Fig. 8.
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Table 22: Transmitter Control Registers TX/RX Definition Control Registers Register (HEX) Name 0x02 TX power 0x04 TX XTAL trim 0x0c TX enable 0x0f Data filter
Data Sheet
Bits All All 4 4,5,6
States
Comments
0x1e
TX/RX invert
5
0 1 000 001 010 011 100 101 110 111 0 1
Transmitter is off Transmitter is on 1.1kHz 2.3kHz 5.2kHz 10.4kHz 1.18kHz 2.57kHz 7.0kHz 20.45kHz Normal levels Inverted
Table 23: Output Impedance Characteristics Specification Settings Output impedance Output power Harmonics Frequency range RFPWR 0x00 RFPWR 0xff
Conditions Resistance Capacitance
Min.
11 Ext. circuit Target Quick Start Full range 402 350 300
Typ. 22 3 -26 12 -35
Max.
13 405 448 768
Units pFarads dBm dBm dBm MHz MHz MHz dBm
Modulation On/off ratio
TX output
ASK/OOK 70
Figure 8: Transmit Waveforms
9.3 Sniff Mode
TM
TM Applications based on low power consumption require Sniff Mode operation of the AMIS-52150. This mode turns off the receiver and the crystal oscillator during programmable, regular time intervals. At the end of each time interval, the receiver wakes up and sniffs for the incoming RF energy. If energy is detected, the receiver transitions to the full receive mode and starts data recovery from the RF carrier. If energy is not detected, the receiver returns to the low power or "sleep" state. Sniff ModeTM operation is programmable; the TM "sleep" time as well as multiple delay sequences can be fully programmed. Table 24 lists the Sniff Mode control registers.
Typical timing waveforms for operation in Sniff ModeTM are shown in Figures 9 and 10.
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
Table 24: Sniff Function Control Registers Control Registers Associated with the Sniff Function Register (HEX) Name 0x0b SNIFF Threshold 0x0c WAKE on RSSI 0x0d 0x13 0x16 0x18 0x19 0x1a 0x1b SNIFF TIMER RES DATA FILTER IRQ DELAY RSSI DELAY SNIFF TIMER OFFSET DWELL DATA FILTER PRE-DIVIDER
Bits All 5 3 All All All All All All
States 0 1 0 1
Comments Reference level for detected RF Do not wake on RSSI Wake on RSSI > threshold Resolution is set to 0.5mS per step Resolution is set to 64mS per step Delay from RX wakeup to data sampled 2 Time I C and TX/RX are active to indicate a wakeup Delay from wakeup to RSSI being checked Time that receiver is off in Sniff Mode Time allowing receiver to power up (typically >40uS) Delay from data detection to pre-clock output
Figure 9: Receiver Data Acquisition in Sniff ModeTM
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
Figure 10: Sniff Timing at RF Energy Detection
9.4 Quick Start There are two oscillators in the AMIS-52150, a low power 10kHz RC oscillator and a crystal oscillator, respectively. The RC oscillator is used to keep the AMIS-52150 running in the ultra-low power mode. This oscillator is used to generate the clock signals for the Sniff ModeTM timers as well as the wake-up timers. Figure 11 shows a block diagram of the clocks in the AMIS-52150. The crystal oscillator provides the reference frequency which is used to generate the RF frequencies for transmission and receiving of data. It is also the reference for all the timing functions in the AMIS-52150. The RC oscillator is in turn used to produce a "kicker" signal when the Quick Start function of the crystal oscillator is needed.
Figure 11: Internal Clocks
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
A "kicker" circuit stimulates the crystal oscillator circuit with oscillations close to the final frequency. This significantly reduces the time it TM takes for the oscillator to reach and lock to the final frequency. The Quick Start function is necessary for operation in Sniff Mode . Table 25 lists the Quick Start control registers. For further details, refer to the application note titled "Quick Start Crystal Oscillator Circuit Operation and Set-up".
Table 25: Quick Start Control Registers Quick Start Control Registers Register (HEX) Name 0x03 Kicker Trim 0x0e Kick Config1 Kick Config2
Bits All 4 5
States 0 1 0 1
Comments Trim the internal RC OSC to form a kick-start to the XTAL oscillator Common mode clamp disabled (startup) Common mode clamp enabled (normal) Normal operation Continuous kick On
9.5 Data Detection The RSSI circuit creates an analog voltage waveform (18mV/dB) that follows the signal strength of the RF signal. The data slice circuit then samples that waveform to create the digitized data. The slice circuit in the AMIS-52150 can be programmed to operate in one of three modes; DAC mode, Average mode or Peak mode. The DAC mode compares a fixed slice threshold value to the level in the slice output. The digital data state is determined by the level of the slice output being above or below that fixed threshold. For further details, refer to the application note titled "Setting Up the AMIS-52150 Data Slicing Modes". Figure 12 shows a typical waveform for the DAC mode, while Table 26 shows the control registers for the auto slice modes.
Figure 12: DAC Slice Mode Waveform
In the Average mode, the threshold value is generated automatically. This threshold value is then compared to the output of the slice circuit to re-create the digital data. The slice circuit along with an external capacitor are used to generate a charging time constant which is equal to charging to 95 percent of a bit level in two bit time periods. The data protocol should add a header to the data to allow the slice circuit to determine the average level. For further details, refer to the application note titled "Setting Up the AMIS-52150 Data Slicing Modes". Figure 13 shows a typical waveform for the Average mode. Table 26 shows the control registers for the auto slice modes.
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
Figure 13: Average Slice Mode Waveform
In the Peak mode, a threshold value is generated automatically as well. This threshold value is then compared to the output of the slice circuit to re-create the digital data. The operation of the slice circuit is based on an external capacitor with an internal peak detector, in order to arrive at the peak value of the data waveform. The threshold value is set 6dB below this peak value. The capacitor value should be selected so that the peak detector does not discharge during periods of continuous zeros, while being small enough to allow the peak detector to reach the peak value quickly. For further details, refer to the application note titled "Setting Up the AMIS-52150 Data Slicing Modes". Figure 14 shows a typical waveform for the Peak mode.
Figure 14: Peak Slice Mode Waveform
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Table 26: Auto Slice Control Registers Auto Slice Control Registers Register (HEX) Name 0x0a DATA SLICE THRESHOLD 0x0f HYSTERESIS
Data Sheet
Bits All 0,1
States
AUTOSLICE
2,3
00 01 10 11 00 01 10 11
Comments Set a fixed reference level for the slice output to be compared to in the DAC mode 0mV hysteresis used in the threshold circuit 20mV hysteresis used in the threshold circuit 50mV hysteresis used in the threshold circuit 100mV hysteresis used in the threshold circuit DAC mode used for data detection (DEFAULT) Average mode used for data detection Peak mode used for data detection DAC mode used for data detection
9.6 Data and Clock Recovery Data recovered in a noisy environment or from a weak RF signal is usually jittery. The AMIS-52150 can remove much of that data jitter by recovering a synchronous clock signal from the incoming data. The device can be set to achieve auto slice data detection. The clock and data recovery circuits can be programmed to generate a data clock for synchronously clocking the data output from the transceiver, removing much of the jitter in this process. The AMIS-52150 has an internal PLL that must be programmed to the frequency of the data by setting the values in the FWORD register and setting the coefficients of the filter. If these values are close to the data rate, the device will recover the data clock from the incoming detected data. The CDR circuit can also be set to a given tolerance with respect to the frequency difference between the target data rate and the actual data rate, in order to improve the performance of the CDR function. The CDR circuit can also be configured to reset after a programmed number of data time periods if no data is received. This "stop and check" function allows the CDR circuit to re-acquire the clock data when new data is received, maintaining better clock to data synchronization. Table 27 lists the registers associated with the data and clock recovery function. For further details, refer to the application note titled "AMIS-52150 Clock and Data Recovery Circuit Operation and Set-Up".
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Table 27: Data and Clock Recovery Control Registers Data and Clock Recovery Associated Registers Register (HEX) Name Bits States 0x07 FWORD LSB All 0x08 FWORD All 0x09 FWORD MSB All 0x0d DATA MUX 6 0 1 CLKMUX 7 0 1 0x10 K0 0,1,2 000 001 010 011 100 101 110 111 K1 4,5,6 000 001 010 011 100 101 110 111 0x11 K2 0,1,2 000 001 010 011 100 101 110 111 FsDIV 4,5,6 000 001 010 011 100 101 110 111 0x12 STOP CHECK 0,1 00 01 10 11 LOOPCLAMP 2,3 00 01 10 11 FREERUN 4 0 1 CRD RESET 5 0 1 AUTO/MANUAL 6 0 RESET 1 SAMPLE 7 00 WINDOW 00
Data Sheet
Comments Sets the initial internal clock frequency for the clock and data recovery circuits TX/RX normal signals Recovered data on TX/RX Normal CLKOUT signals Recovered CLOCK output on CLKOUT Filter coefficient gain is 1 Filter coefficient gain is 2 Filter coefficient gain is 4 Filter coefficient gain is 8 Filter coefficient gain is 16 Filter coefficient gain is 32 Filter coefficient gain is 64 Filter coefficient gain is 128 Filter coefficient gain is 1 Filter coefficient gain is 2 Filter coefficient gain is 4 Filter coefficient gain is 8 Filter coefficient gain is 16 Filter coefficient gain is 32 Filter coefficient gain is 64 Filter coefficient gain is 128 Filter coefficient gain is 0.125 Filter coefficient gain is 0.250 Filter coefficient gain is 0.500 Filter coefficient gain is 1.000 Filter coefficient gain is 2 Filter coefficient gain is 4 Filter coefficient gain is 8 Filter coefficient gain is 16 Sample frequency divider is 2 Sample frequency divider is 4 Sample frequency divider is 8 Sample frequency divider is 16 Sample frequency divider is 20 Sample frequency divider is 32 Sample frequency divider is 40 Sample frequency divider is 48 StopCheck bits: disabled StopCheck bits: 2 StopCheck bits: 4 StopCheck bits: 8 Loop clamp value is: +-BaudClk/8 Loop clamp value is: +-BaudClk/16 Loop clamp value is: +-BaudClk/32 Loop clamp value is: +-BaudClk/64 Phase alignment enabled Phase alignment disabled CDR reset disabled CDR reset enabled POR reset (auto) CDR reset enabled (manual) Sampling starts with bit start edge Sampling centered around bit center
The clock and data recovery function is dependent on the receiver's ability to recover the data from the incoming RF signal. There exists a technique to test the clock and data recovery function without having to set up the receiver to receive data. This is a test mode that allows an input data stream (square wave at 1/2 the data rate) on the RSSI pin, with the recovered clock data appearing on the CLKOUT pin and the recovered data appearing on the TX/RX pin, respectively. Once the AMIS-52150 is configured for clock and data
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
recovery (see the application note titled "AMIS-52150 Clock and Data Recovery Circuit Operation and Set-Up"), the register shown in Table 28 can be used to define the test mode operation.
Table 28: Clock and Data Recovery Test Mode Clock and Data Recovery Test Control Register Register (HEX) Binary Code HEX Code 0x1d 00001110 0x0e 00001111 0x0f
Comments Normal RSSI digital input CDR start bit digital input to RSSI
9.7 Wake-Up Function Ultra-low power applications can take advantage of the wake-up function of the AMIS-52150. The AMIS-52150 can be placed in a low power or "sleep" state until an interrupt based on the programmable wake-up timer is generated. This wakes up the transceiver, which then flags the external microcontroller to perform the required application-specific operations. The wake-up interrupt is also generated based on detection of RF energy (Sniff ModeTM). Communication with the microcontroller takes place via the I2C bus. In addition, when the AMIS-52150 is in the "sleep'" state, the wake-up signal can be generated by the microcontroller. Table 29 lists the registers associated with the wake-up function.
Table 29: Application Wake-Up Control Registers Application Wakeup Control Registers Register (HEX) Name Bits 0x14 AW TIMER DIV All 0x15 AW TIMER All 0x17 PRE/POST AW All DELAY
States
Comments Divides the RC oscillator to form a clock for the AW Number of AW clock periods before a AW wakeup Number of CLKOUT clock periods before the TX/RX pin goes low for a AW cycle
9.8 I2C Interface The I2C is a two pin bi-directional serial interface communication bus, with a data line and a clock line, respectively. Serial data on the data pin is clocked into or out of the AMIS-52150 by the clock pin. The AMIS-52150 is implemented as a slave device, which means that the external controller is the master device. The clock signal for all transmissions between the master (controller) and the slave (AMIS-52150) is generated by the controller. The serial communication bit rate can be as high as 400Kbps. A communication link is initiated based on a start sequence. Bi-directional communication continues as long as the master and slave acknowledge the write or read sequences, and is terminated with a stop sequence. This is illustrated in Figure 15, Figure 16 and Figure 17, respectively.
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
Figure 15: 12C Valid Control Waveforms
Figure 16: 12C Protocol in a Write 68 (Hex) or a Data Write Request
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
Figure 17: 12C Write and Read Protocol
9.9 Registers The AMIS-52150 is comprised of 31 registers. For further details, refer to the application note titled "AMIS-52150 Register Definitions and Functions".
9.10 Power-On-Reset/Brown-Out Detection The POR/brown-out detection circuit ensures that the AMIS-52150 will be in a reset state when VDD drops below a certain threshold voltage, and remains in this state until VDD rises above another threshold voltage. The characteristics of the POR circuit are shown in Figure 18.
Figure 18: Power-on-Reset Characteristics
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
9.11 Alternative Wake-Up Functions
Figure 19: Wakeup Circuits
The AMIS-52150 will wake up from the low power mode upon a) reception of RF energy, b) an interrupt generated by the wake-up timer, or c) an interrupt generated by the external controller. In this low power mode, the RF circuits, the crystal oscillator, and the CLKOUT circuits are shut off, and only the RC oscillator and the wake-up divider circuitry are active. Once the AMIS-52150 receiver detects RF energy and wakes up, the RX/TX pin is set "low" while the I2CDATA and I2CCLK pins can remain "high". In addition, when 2 the wake-up timer wakes up the AMIS-52150 to in turn flag the external controller, the TX/RX and I CDATA pins are set "low" while the 2 I CCLK pin can remain "high". The external controller can also signal the AMIS-52150 to wake up by setting both the I2CDATA and 2 I CCLK lines low. These functions are shown in Table 30.
Table 30: Wakeup Truth Table Wakeup Truth Table Wakeup Source SNIFF HK Cycle External TX/RX 0 0 1 I CDATA 1 0 0
2
I CCLK 1 1 0
2
CLKOUT XTAL out RC oscillator Don't care
Comments Wake on RF energy detect Wake due to HK timer timeout Wake due to external controller
10.0 Ordering Information
Table 31: Ordering Information Ordering Code Device Number 19293-001-XTP (or -XTD) AMIS-52150
Package Type 20-pin SSOP (209mil, shrink small outline package)
Industry Application Industrial, Automotive, other
Shipping Configuration Tape & Reel (-XTP) Tube/Tray (-XTD)
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AMIS-52150
Low-Power Transceiver with Clock and Data Recovery
Data Sheet
11.0 Company or Product Inquiries
For more information about AMI Semiconductor`s products and technologies, visit our Web site at: http://www.amis.com.
Devices sold by AMIS are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. AMIS makes no warranty, express, statutory, implied or by description, regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. AMIS makes no warranty of merchantability or fitness for any purposes. AMIS reserves the right to discontinue production and change specifications and prices at any time and without notice. AMI Semiconductor's products are intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing by AMIS for such applications. Copyright (c)2007 AMI Semiconductor, Inc.
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