5-10. Ic Pin Function Description - Sony SPP-A941 Service Manual

5-10. IC PIN FUNCTION DESCRIPTION

• BASE MAIN BOARD U1 LSC527737DW-A94100FB (SYSTEM CONTROLLER)
Pin No. Pin Name I/O
System reset signal input from the reset signal generator (Q2, 3) "L": reset
1 RESET I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
2 IRQ I Interrupt request signal input terminal Not used (fixed at "H")
DTMF1 to
3 to 8 O DTMF signal output terminal
DTMF6
9 EEP CS O Chip select signal output to the EEPROM (U3) "L": un-select, "H": select
Chip enable signal output to the RF unit (RF1)
10 PLL EN O
When PLL EN goes from "L" to "H", it load data from PLL DATA
11 EEP/PLL DATA O Serial data output to the EEPROM (U3) and RF unit (RF1)
12 EEP DI I Serial data input from the EEPROM (U3)
13 EEP/PLL CLK O Serial data transfer clock signal output to the EEPROM (U3) and RF unit (RF1)
14 VSS — Ground terminal
15 TX ENABLE O TX system power supply on/off control signal output "L": TX system power on
RX and TX muting control signal output to the TA31103F (U4) "L": muting on
16 MUTE O RX mode: After receiving premble bits from handset muting it until data sent finished
TX mode: During sending data to handset, muting it
17 OFF HOOK O Hook on/off control signal output terminal "L": off hook, "H": on hook
18 CAR-DET I Carrier detect signal input from the RF unit (RF1) "L": signal, "H": no signal
19 CRADLE DET I Detect signal input of the handset unit on cradle or off cradle "L": on cradle, "H": off cradle
20 RINGER DET I Detect signal input of the ringer coming "L": ringer is detected
21 PAGE I HANDSET LOCATOR switch (KP16) input terminal "L" is input when key pressing
22 TONE/PULSE I DIAL MODE select switch (SW1) input terminal "L": pulse, "H": tone
23 ATE I/O Communication in/out terminal with ATE program
24 TX DATA O Transmit data output terminal
25 RX DATA I Receive data input terminal
26 OSC2 O Main system clock output terminal (4 MHz)
27 OSC1 I Main system clock input terminal (4 MHz)
28 VDD — Power supply terminal (+5V)
Description
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• HAND MAIN BOARD U3 LSC526609DW (SYSTEM CONTROLLER)
Pin No. Pin Name I/O
System reset signal input from the LP2953IM (U11) "L": reset
1 RESET I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
2 IRQ I Interrupt request signal input terminal
3 to 6 COL3 to COL0 O Key scan signal output to the key matrix
7 to 10 ROW4 to ROW1 I Key scan signal input from the key matrix
11 PLL DATA O Serial data output to the RF unit (RF2)
Chip enable signal output to the RF unit (RF2)
12 PLL EN O
When PLL EN goes from "L" to "H", it load data from PLL DATA
13 PLL CLK O Serial data transfer clock signal output to the RF unit (RF2)
14 VSS — Ground terminal
15 TX ENABLE O TX system power supply on/off control signal output "L": TX system power on
16 RX ENABLE O RX system power supply on/off control signal output "L": RX system power on
TALK/BATT
17 O LED drive signal output of the TALK/BATT LOW indicator (D5) "L": LED on
LED
18 LIGHT LED O LED drive signal output of the key back light Not used (open)
RX and TX muting control signal output to the TA31103F (U7) "L": muting on
19 MUTE O RX mode: After receiving premble bits from base unit muting it until data sent finished
TX mode: During sending data to base unit, muting it
20 BEEP O Buzzer sound drive signal output terminal
21 ATE I/O Communication in/out terminal with ATE program
22 LOW BATT I Battery level detect signal input from the LP2953IM (U11)
23 CRADLE DET I Detect signal input of the handset unit on cradle or off cradle "L": on cradle, "H": off cradle
24 TX DATA O Transmit data output terminal
25 RX DATA I Receive data input terminal
26 OSC2 O Main system clock output terminal (4 MHz)
27 OSC1 I Main system clock input terminal (4 MHz)
28 VDD — Power supply terminal (+5V)
Description
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