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IC DESCRIPTION IC, TMP87C408N (BASE UNIT)
Pin No. 1 2 3 Pin Name XOUT XIN TEST I/O O I I Oscillator out Oscillator in Tied low Hook control output (for corded phone): 0 = OFF HOOK, 1 = ON HOOK 4 HOOK CONT SPK MUTE O For ZPC-6: this pin is used as Speaker Amp, IC Mute Control) (the Mic Mute control is controlled by hardware: unmute mic when Speaker is unmute and charge not detected) Received Signal Strength Indicator: (TB31224F SIG OUT pin) 5 SIG OUT I 0 = carrier present, 1 = carrier absent NOISE DETECT 0 = Rx unlock, 1 = Rx lock 0 = Tx unlock, 1 = Tx lock 6 CHAG DET CLK EEPROM 7 8-10 11 DTMF4 DTMF3-DTMF1 DTMF0 COUNTRY S2 12 13 14 15 16 RING OFF COUNTRY S1 PAGE KEY GND PLL STB PLL DATA U LED 17 18 19 PLL CK DO EEPROM DI EEPROM TL RELAY TL MUTE M B SEL O I/O I/O I � O O I/O O O I/O I/O Rx LOCK DETECT Tx LOCK DETECT Description
Charge detect: 0 = charging, 1 = not charging. Clock of EEPROM DTMF data pin 4 (Most Significant Bit) DTMF data pin 3-1 DTMF data pin 0 (Least Significant Bit) Country option select 2. Control the shunt resistor: 1 = shunt a resistor (For U, K ONLY) Country option select 1 PAGE key: 1 = PAGE ON, 0 = STANDBY Ground Combo chip strobe signal (TB31224F) Combo chip data signal (TB31224F). In-use LED: 1 = ON, 0 = OFF. Combo chip clk signal (TB31224F). Data Input/Output of EEPROM. Line seize: 1 = line seize, 0 = off-hook Telephone Line Mute Control: 1 = MUTE. Make/Break Ratio Select 1 = 33.3%, 0 = 40% Hook detect input (for Corded Phone). 1 = ON HOOK, 0 = OFF HOOK
20
HOOK DET
I
REMARK: this pin is always PULL-HIGH for ZPC-7 or ZPC-6 (I. e. just imagine Corded phone is Always ON HOOK)
21 22 23 24 25 26 27 28
TX PWR SCRET OPT TX DATA BUZZER T P SEL RX DATA RING DET BAND SQ SELECTION
____________
I/O O I/O I I I/O I �
Tx power control: 0 = ON, 1 = OFF. Secret function option: 1 = YES, 0 = NO REMARK: this PULL LOW for ZPC-7 or ZPC-6 (I. e. Secret opt is DISABLED) Transmit data output Buzzer signal (key tone and paging sound ONLY) Tone/Pulse selection: 1 = Pulse, 0 = Tone Received data input Ring detect input: 1 = OFF, 0 = RING COME (MC34012) Shunt capacitor for U.S. Frequency Higher Band: 1 = shunt Cap, OUT OF RANGE FUNCTION: 1 = YES, 0 = NO Normally High, Low to reset MCU Power (VCC) 29
RESET POWER
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