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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
GENERAL DESCRIPTION
ary
The EM91850 are tone/pulse switchable dialer with Last Number Redail (LNB) and SAVE function, which are fabricate in CMOS technology with wide operating voltage for both tone and pulse mode. EM91850 consumes very low memory retention current in on hook state. The EM91850 provide necessary functions of telephone set for application in any environment, such as pulse dialing, tone (DTMF) dialing, handfree dialing. Beside this, hold , mute and redial function are provide for particular operation. In redial mode EM91850 can auto insert pause time for application in PABX system. EM91850 also have a special I/O pin - VAO can used tocontrol the receive volume amplify circuit. FEATURES * * * * * * * * Volume add Control Function. One key Redial Function. Flash key is available and have multiple Flash time ( 600 ms, 300 ms, 100 ms ) can be selected. Auto Insert Pause Time. Tone/Pulse Switchable. Pulse mode fixed 10PPS. Pulse to tone ( PT ) key is provided for PABX operation. Many options can be selected by R option. Mode ( Pulse, Tone ) M/B ratio ( 40:60 ; 33:66 ) Auto insert pause time ( enable ; disable ) One set 32 digits SAVE function. One set 32 digits LNB redial function. Mixed and cascaded dialing. Hold and Mute function. Hand Free dialing. Tone duration and inter -tone pause are fixed at 90 ms. Flash pause time are fixed at 600 ms. Pulse to Tone pause time are fixed at 3.6sec. Uses 3.579545 MHz crystal or ceramic resonator (with built-in capacitor, no need extra capacitor). Package in DIP 16.
* * * * * * * * * *
Total System
* Operating voltage : 2.0V ~ 5.5V * Operating current : Tone mode 0.3 mA (typical) ~ 0.5 mA Pulse mode 0.15 mA (typical) ~ 0.2 mA * Standby current : 0.01 uA ( typical ) 0.1 uA (max.) * Use single clock 3.579545 MHz crystal
* This specification are subject to be changed without notice.
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
PIN ASSIGNMENTS
in P re l i m
EM91850
K6/XMUTE K5 K4/MUTEO XIN XOUT VSS VAO HFI 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
ary
K3 K2 K1/HDO DTMF PO HKS VDD HFO
PIN DESCRIPTIONS
Symbol K2 , K3 , K5 I/O pin K1/HDO Function Key board scan I/O pins, key scans by ripple way. These pins output 16K Hz signal one by one and periodically for key board scan. This pin has two functions. Normally this pin will be a Key board scan pins function same as K1~K6. In Hold condition this pin will stay in "High" level to control the Hold circuit and scan HD input key. In Hold condition all key will not allow keying except HD, HF and Hook switch. This pin has two functions Normally this pin will be a Key board scan pins function same as K1~K6. In MUTE condition this pin will stay in "High" level and output signal with the inverse of key scan to control the MUTE circuit and scan input key . Any key input will release MUTE condition. This pin has two functions Normally this pin will be a Key board scan pins function same as K1~K6. The Tone/Pulse dialing Mute signal output pin. This pin will switch to "High" level during Tone/Pulse dialing and hold function. Otherwise, this pin DC level stays "Low". Positive and negative power supply input pin Oscillator input and output pins , built in two 5pf capacitor so it's not need external capacitor. A 3.579545 MHz crystal must be crossed between Xin and Xout. Handfree function Input pin accepts rising edge signal to turn "on" or turn "off" handfree function. This pin is hysteresis input structure and built-in pull down resistor (typically 200 K). Handfree outputs pin that is designed to control telephone line for on-hook dialing or control speakerphone circuit for handfree conversation. When handfree function is executed, this pin will switch to "High". Otherwise, this pin stays "Low" level. Hook Switch detects input pin , which is hysteresis input structure and without internal pull up resistor. DTMF (Dual Tone Multi-Frequency) output pin, In tone dialing mode, this pin will output DTMF signal that is corresponding to key board 0~9, *, # key. Pulse signal output pin that is NMOS open-drain. This pin is for pulse dialing. This output is "Low" during pulse dialing blank duration and Flash operation active, otherwise will be "High impedance". Volume Add output pin , which is open drain structure. Normally this pin will stay in "High Impedance". When Volume add active and dialer in OFFHOOK mode operting then this pin will output "Low".
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K4/MuteO
K6/XMUTE
VDD, VSS Xin , Xout HFI
HFO
HKS DTMF PO
VAO
* This specification are subject to be changed without notice.
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
Key Assignment :
ary
K1
HD
K2
RD
SAVE
K3
1 2 5 8 0
R
3 6 9
MUTE
K4
4
K5
7 P F1
R
VA F2
R
K6
*/T HDO
#
R_option
F3 XMUTE
MuteO
R_option
KEYBOARD DESCRIPTION :
Key 0~9,*,# F1 , F2 , F3 */T RD P HD HF SAVE VA MUTE Description Digit key. Flash key, flash time F1=600ms F2=300ms F3=100ms. In Pulse mode, this key mean Pulse to Tone function key. Redial and One key Redial key. Pause key. Hold function key, at hold mode to key in "HD" key will go to idle On-hook state. Handfree function key. SAVE function key. Volume Add key. MUTE key. When this key be pressed MuteO output will be "high", and any key-in will release mute.
* This specification are subject to be changed without notice.
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
FUNCTION DESCRIPTIONS
in P re l i m
ary
Dialer Option selection The EM91850 incorporated a special keyboard scanning function that is connecting a resistor ( typically is 560 K ) on keyboard scan pin to select many telephone specifications. The specifications are described as follow : a. M/B ratio K2 M/B ratio NR 40:60 R-Vss 33:66 b. Auto Insert Pause time K3 Auto Insert Pause time NR Disable R-Vss Enable d. Mode K5 NR R-Vss
Mode Tone Pulse
Normal Dialing : Press the digital key directly on keyboard which number can be dialing out and stored in LNB memory auto matically. Operating procedure described as following: * To select Pulse or Tone mode. * Off-Hook or turn on HF function. * Keying d1,d2,....dn. The "d" expressed digital key pressed that include 1~9, *, 0, #, P, and PT keys. The "n" expressed unlimited. * The numbers d1,d2,......, dn will be dialed out in Pulse or Tone mode as selection. LNB Redial Function : Storing : In normal dialing mode, every digital key was entry which number will be stored in LNB memory automatically. If entry digits are more than 32 digits, the redial function of LNB memory will be disabled, otherwise, these numbers stored in LNB memory can be redial output. Redialing : EM91850 provide Redial and One Key Redial function (1) Redial function Off-Hook normal dialing directly keying "F" key (or ON-OFF Hook once) and key-in "RD" keyboard. The numbers stored in LNB memory will be dialed out. (2) One Key Redial function Off-Hook normal dialing, if busy, press the "RD" key directly then the line will be broken about 1.2 sec with Trp redial pause time and dial out the numbers stored in LNB memory automatically.
* This specification are subject to be changed without notice.
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
Auto Insert Pause Time Function
in P re l i m
ary
EM91850 Provides a new function - Auto Insert Pause Time function - for PABX system user. In PABX system, we usually use a special number to identify the phone want dial out or just a internal phone. So between the first and second number, the PABX system will switch to central office, that will be few second switch time. The auto insert pause time function will auto insert the pause time between first and second digit in redialing mode. This function are provide a pause time to wait PABX switch to Central Office. In fact, the pause time are record the waiting time of last dialing between the first and second digit. The auto insert pause minimum duration are equal 0 second, maximun duration are equal 3.5 second, and pause duration scale are 0.1 second. So, if the time during user keying first and second digit are longer than 3.5 second, the auto insert pause time will be limited at 3.5 second. By this function, we can redial the correct number out in PABX system.This function can select enable or disable by R_option. Pause(P) key operation The Pause(P) key is designed to support pause operation in dialing duration. "P" key can be stored in memory and it will occupy one digital position. * To select Pulse or Tone mode. * Off-hook(or turn on HF function), push (d1, d2,....dn,, P , k1, k2, ..... ,kn). These numbers will be dialed out as following sequence : d1, d2,.....dn, Tp, k1, k2, ..... ,kn (Tp are the pause Time) SAVE redial memory The SAVE memory is designed in EM91850 to support digits capacity buffer for second redial, pager, special memory for memo and other system applications. Storing : EM91850 support two operating methods to store numbers into SAVE redial memory. Method 1 : * To select Pulse or Tone mode. * Off-hook(or turn on HF function), push d1, d2 ....., dn. The numbers d1, d2,..., dn will be dialed out in Pulse or Tone mode as selection. * After dn had been dialed out and push [ST]. SAVE key. If the keying numbers are more than 32 digits that content of SAVE memory can not be updated. Otherwise, these numbers will be stored into SAVE memory. Noted : In the [ ] key allows to be omitted. The SAVE buffer are the length 32 digits number Method 2 : On or Off-hook (or turn on HF function), push ST, d1, d2 ....., dn, [ST], SAVE. If the keying are not over 32 digits, the numbers d1, d2, ....., dn will be stored in SAVE redial memory automatically. Dialing * To select Pulse or Tone mode. * Off-hook(or turn on HF function or after executing Flash function), first push SAVE key. The numbers stored in SAVE memory will be dialed out in Pulse or Tone mode as selection.
* This specification are subject to be changed without notice.
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
ary
Mixing dialing : Let LNB=7,8,9 At off-hook state, key in "RD", *, 0, P, then the LNB=7, 8, 9, *, 0, P, and the number will be dialed out. Pulse to Tone(*/T) key operation The Pulse to Tone(*/T) key is designed to support toll dialing (long distance call) or PABX system operation. The "*/T" key can be stored in memory and it will be occupy one digital position. * To select Pulse mode. * Off-hook(or turn on HF function), push d1, d2,...dn, */T, k1, k2, ....,kn. These numbers will be dialed out as following sequence : d1, d2,....dn, Tpt, k1, k2, ....., kn. (Tpt are the Pulse to Tone pause time) (pulse mode) (tone mode) Flash(F=F1,F2,F3) key operation The Flash key is designed to break telephone line temporarily. After key is depressed, this dialer will send a flash signal to break line and reset all condition. The Flash's break time dependent on the which key be pressed, F1=600ms, F2=300ms, F3=100ms. Handfree (HF) function The Handfree function are provided in EM91850 to support on-hook dialing and loudspeaker application which can be turn "on" or "off" by pressed again "HF" key. During handfree function is executed, the HFO pin is switched to "high". Otherwise the HFO pin stays "low" level. One of the following operations can turn off Handfree func tion (HFO pin return to "Low"). * On-Off hook once. * Pressed "HF" key * Turn on Hold (HD) function.(HDO pin switched to "High") Hold (HD) function The Hold function is designed to stop conversation temporarily. In off-hook state (or HF function is turned on), to press HD key on the keyboard, the Hold function can be turned "on" (HDO pin switched to "High"). One of the following operations can turn off Hold function (HDO pin switched to "Low"). * On-Off hook once. * To press HD key back to idle On_Hook state * Turn on Handfree (HF) function.(HFO pin switched to "High") ** In Hold state all key board will be disable except "HF" , "HD" key and HKS switch Mute function The EM91850 provide mute function to mute microphone or antler at off-hook (or turn on HF) state. When keyin "MUTE" key, "MuteO" pin will become "High" to mute microphone. Any key-in will release mute mode and operating the correct key.
* This specification are subject to be changed without notice.
4.28.1999
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
Volume add function
ary
EM91850 provide Volume Add function to control the speech network for adding the receiving volume. Except idle On-Hook state, Volume add function will working effect no matter what state is. Volume add function are toggle structure. Every time touch VA key will inverter the VAO pin condition ( HLHL.....). So Volume add will active or release each time keying VA. If and only if, when dialer back to the idle On_Hook state then the Volume add function will force to release. This solution protect the user will not be hurt by loud volume. Although Volume add state will not change by Off_Hook or HF operation but if dialer are in HF mode then Volume add outpout (VAO) will be inhibited. Noted : Except dialer back to idle state, any other operate will not reset volume add situation ( include HD, HF , Flash ..... , and so on ). So volume add situation will be hold until dialer back to idle.
* This specification are subject to be changed without notice.
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
OPERATING FLOW CHART
HF HF
in P re l i m
(1)
ary
On_Hook state
HKS=L
(4) On_Hook HF state HD
HKS=H (2) Off_Hook state
HKS=L
HD HF (6) On_Hook HD
HKS=H
(3) Off_Hook HF HD HKS=H HKS=L
HF HF HF HD (5) Off_Hook HD HD
: HF=Handfree
HD=Hold
Truth Table : Operating state HKS (1)On-hook, idle state (2)Off-hook line (3)Off-hook, HF line (4)On-hook, HF line (5)Off-hook, HD line (6)On-hook, HD line H L L H L H Input / Output pin level PO XMUTE Z Z Z Z Z Z L L L L H H
HFO L L H H L L
HDO L L L L H H
Note : Z= floating (high impedance) ; H= logic "High"; L= logic "Low" level. @ = To doing R-option
* This specification are subject to be changed without notice.
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
ABSOLUTE MAXIMUM RATINGS(Ambient temperature is 25oC, all voltages referenced to VSS)
Items Power supply voltage Input voltage range Operating temperature Storage temperature Power consumption Sym. VDD VIN TOPR TSTO PD Rating 6.0 VSS-0.3V ~ VDD+0.3V 0 ~ +70 -55 ~ 150 500 Unit V V o C o C mW
in P re l i m
ary
RECOMMENDED OPERATING CONDITIONS
1. Supply voltage range from 2 V to 5.5 V at fc=3.58 MHz 2. Operation frequency: 3.58 MHz crystal.
D.C. ELECTRICAL CHARACTERISTICS
(VSS=0V; TOPR=0oC to 70oC, VDD=3V unless otherwise noted)
Parameter Operating voltage Tone Pulse Memory retenion
Sym. Min. 2.0 2.0 1.0 Istby IDD Imrt ViH 0.7 ViL Vss IoH -0.2
VDD
Typ. Max. Unit 0.001 0.15 0.3 0.15 0.001 -350 20 -350 20 1.5 5.5 5.5 5.5 0.1 0.3 0.5 0.3 0.1 1 0.3 200 -0.01 -420 50 -420 50 2 V
Condition unload
Standby current Operating current Memory retention current HKS, HFI Input voltage HFO Drive current Sink current HFO pull down resistor VAO Leakage current Sink current MuteO, HDO, XMUTE Drive current Sink current K2, K3, K6 Output current PO Sink current Tone Pulse
A mA mA uA V DD mA
Idle On_Hook state
HKS=1,Vdd=1V Schmitt trigger Vo=2.5V Vo=0.5V K Vxmute=Vdd Vxmute=0.5V Vo=2.5V Vo=0.5V Vo=2.5V Vo=0.5V Vo=0.5V
IoL Rhf IoH IoL IoH IoL IoH IoL IoL
0.2 1 -270 10 -270 10 1
uA mA uA
uA mA
* This specification are subject to be changed without notice.
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
DTMF CHARACTERISTICS (VSS= 0V , VDD= 3V , Topr = 0oC to 70oC)
Symbol Twist DC level Dist Ac level Sink current Load resistor Minimum tone duration Minimum intertone pause Description Twist=20 LOG(COL/ROW) Vdc , Vdd=2.0V~5.5V Distortion Row group Vdtmf=0.5V Dist<-23dB Td ( redial ) Titp ( redial ) Min. 1 0.55 130 0.2 5 Typ. 2 -30 155 90 90 Max. 3 0.7 -23 180 Unit dB Vdd dB mVrms mA K ms ms
in P re l i m
ary
ACTUAL FREQUENCY OUTPUT ( fosc =3.579545 Hz )
F1 F2 F3 F4 F5 F6 F7 Standard (Hz ) 697 770 852 941 1209 1336 1477 Output ( Hz ) 699 766 848 948 1216 1332 1472 Deviation ( % ) +0.28 -0.52 -0.47 +0.74 +0.57 -0.30 -0.34
ELECTRICAL CHARACTERISTIC
(VDD-VSS=3.0V,Fosc=3.58 MHz)
Parameter Keyin or release debounce Pulse rate Make/Break ratio Inter-digit pause time Pause time Pulse to tone time Flash break time
Sym. Tdb PSR MBR Tidp Tp Tpt Tf
Min. 0 -
Typ. 18 10 40:60 33:66 800 3.6 600 300 100 600 90 1.2 1 1/32 0.25 2.25 5
Max. Unit 3100 ms pps % ms S F1 key F2 key F3 key
Condition
K2 pin=NR K2 pin=R-Vss
mS mS mS S S mS mS mS mS mS
Flash Pause time Tone duration One key redial Break time One key redial Pause time Scan wave width Scan wave period Key board scan Period Auto Insert Pause Pre-Mute time
Tfp Td Trb Trb Tsw Tsp Tksp Taip Tpm
* This specification are subject to be changed without notice.
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10
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
TIMING DIAGRAM
in P re l i m
ary
HKS KEY XMUTE DTMF
Td
1 Tdb
Tpm
2
3
Titp
PO XOUT Figure 1. Tone Mode operating Timing
HKS KEY Tdb XMUTE Tpm PO tB DTMF XOUT Tidp Tidp Tidp 1 2 Tdb 3
Figure 2. Pulse Mode operating Timing
* This specification are subject to be changed without notice.
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11
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
Pulse KEY 1 2 */T 3 Tone
ary
4
XMUTE DTMF PO XOUT Tpt
Figure 3. Pulse to Tone operating Timing
F 1 dial inhibited 2 3
KEY
XMUTE Tf PO XOUT Tfp
Figure 4. Flash operating Timing
Tone mode KEY 1 P 2 1
Pulse mode P 2
Tp XMUTE DTMF PO XOUT Tp
Figure 5. Pause operating Timing
* This specification are subject to be changed without notice.
4.28.1999
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
HKS KEY 0 Taip DTMF Td XOUT 5 7
ary
7
9
7
Dialing 057797 so LNB=057797 and Taip timng will be store Then Redial will auto insert Taip timing between RD number 0 and 5
HKS KEY RD Taip
5 7 7 9 7
Titp DTMF XOUT
0
Td
Figure 6. Auto Insert Time operating Timing
(LNB=1 2 3) HKS KEY XMUTE PO XOUT Figure 7. Redail operating Timing( Pulse Mode ) RD
* This specification are subject to be changed without notice.
4.28.1999
13
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
(LNB=1 2 3) HKS KEY XMUTE DTMF XOUT RD
ary
Figure 8. Redial operating Timing( Tone Mode )
LNB= 1 2 HKS KEY XMUTE PO Trb XOUT Trp 1 2 RD
Figure 9. One key Redial operating Timing( Pulse Mode )
LNB= 1 2 HKS KEY XMUTE PO Trb DTMF XOUT Trp 1 2 RD
Figure 10. One key Redial operating Timing( Tone Mode )
* This specification are subject to be changed without notice.
4.28.1999
14
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
Tdb HFI HFO KEY 1 2 RD
ary
LNB = 1 2 XMUTE PO Torf XOUT Trdp
Figure 11. Handfree Mode One key Redial operating Timing( Pulse Mode )
Tdb HFI HFO KEY 1 2 RD LNB = 1 2 XMUTE DTMF Torf PO XOUT Trdp
Figure 12. Handfree Mode One key Redial operating Timing( Tone Mode )
* This specification are subject to be changed without notice.
4.28.1999
15
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
HKS Tdb HFI Tdb HFO KEY K1/HDO XMUTE/K6 K2~K6 XOUT
HF HD HF HD HD
ary
HD
HD
HD
Tdb
Tdb
Figure 13. Handfree and Hold operating Timing
HKS KEY MuteO/K4 XMUTE DTMF XOUT Figure 14. Mute operating Timing 1
MUTE Tdb
2
Tdb
* This specification are subject to be changed without notice.
4.28.1999
16
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
K1 Tsw K2 K3
ary
Tsp
K4 K5 K6 Tksp
Figure 15. Key board scan Timing
HKS KEY
Tsp HD HD Tdb
K1
Tsw
K2 ~ K6
Figure 16. Hold active Key board scan Timing
* This specification are subject to be changed without notice.
4.28.1999
17
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
K1
Tsw Tsp
ary
K2 K3
K4 K5 K6 Tksp
Figure 17. Mute active Key board scan Timing
K1
Tsw
Tsp
K2 K3
K4 K5 K6
Tksp
Figure 18. XMUTE active key board scan Timing
* This specification are subject to be changed without notice.
4.28.1999
18
10M
OFF-HOOK ON-HOOK
TIP
HOOK-SW A92 I_LOOP 220K 1N4148 HFO 100K C945 /VAO MuteO
1N4148
100K 1N4148 SPEAK_Power 10K 470K 1K LED DTMF
-
+
240K
RING
3K3 16V/1W
SPEECH
+
1u XMUTE
Auto Release HOLD Function Circuit
33K 47K 1N4148 A42 0.1u 1N4148 HFO 33K 33K HDO 1N4148 104 103 100K 104 47K C945 /PO
470u
Network
47K 470K 470K C945 C945 1U 104
+
5V1
+
10U
220K
APPLICATION CIRCUIT : CONTROL CIRCUIT
22K
* This specification are subject to be changed without notice.
+
in P re l i m
47K
ary
100K 1N4148
VDD
HF
EM91850
100K
1 2 K6/XMUTE K5 K4/MuteO XIN XOUT VSS VAO HFI K3 K2 K1/HDO DTMF PO HKS VDD HFO 16 15 14 13 12 11 10 9
1N4148 1N4148 100K
3 4 5
KEYBOARD
103 104 3.58M
7 8 6
104
K6 K5 K4 K3 K2 K1
EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
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EM91850 TONE/PULSE DIALER WITH HF, HD, REDIAL AND VOLUME CONTROL FUNCTION
in P re l i m
ary
APPLICATION CIRCUIT : KEYBOARD AND R_OPTION
K1
HD
K2
RD SAVE
K3
1 2 3
K4
4 5 6 MUTE
K5
7 8 9 P VA
K6
*/T 0 # F1 F2 F3 560K AIP T/P MBR
R_Option
* This specification are subject to be changed without notice.
4.28.1999
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