Ic Pin Function Description - Sony SPP-935 Service Manual

5-13. IC PIN FUNCTION DESCRIPTION

• BASE MAIN BOARD U3 LSC433399FB (SYSTEM CONTROLLER)
Pin No. Pin Name
1 DTMF EN
2 EEPROM CS
3 LATCH 1
4 LATCH 2
5 RINGER SW
6 CRADLE DET
7 CAR DET
8 to 12
ROW1 to ROW5
13 SPK MUTE
14 MIC MUTE
15 ATE IO
16 NC1
17 VSS
18 RINGER
19 TX ENABLE
20 HS ON
21 OFF HOOK
22 NC2
23 TEL SWITCH
24 SP SWITCH
25 TX MUTE
26 RX MUTE
27 TONE/PULSE
28 RING DET
29 DO
30 PLL DATA
31 PLL CLK
32 SS
33 TX DATA
34 RX DATA
35 LINE DROP
36 OSC2
37 OSC1
38 VDD
39, 40 NC3, NC4
41 RESET
42 ROW0
43 VPP
44 PLL EN
I/O
O DTMF tone control signal output to the KS58015D (U17) "H": enable, "L": disable
O Chip select signal output to the EEPROM (U4) "H" active, Normally: "L"
Serial data latch pulse output to the MC74HC595AF (U15) When LATCH 1 goes from "L" to
O
"H", contests of shift register transferred to output latches Normally: "L"
Serial data latch pulse output to the MC74HC595AF (U16) When LATCH 2 goes from "L" to
O
"H", contests of shift register transferred to output latches Normally: "L"
I Ringer switch (S1) input terminal "L": ringer off
I Detect signal input of the handset unit on cradle or off cradle "L": on cradle, "H": off cradle
I Carrier detect signal input from the MC13156DWR2 (U1)
I Key scan signal input from the key matrix When key pressing: "L"
O Speaker muting control signal output to the MC34119DR2 (U14) "H": speaker muting on
Microphone muting control signal output to the MC34118DW (U12)
O
"H": microphone muting on
I/O Communication in/out terminal with system controller (U3) on the handset Normally: "L"
O Not used (open)
— Ground terminal
O Ringer tone signal output to the MC34119DR2 (U14)
O TX system power supply on/off control signal output "L": power on
O POWER and IN USE LED drive signal output terminal "L": LED on
O Hook on/off control signal output terminal "H": on hook, "L": off hook
O Not used (open)
O Telephone switch (U13) on/off control signal output terminal "H": on, "L": off
O Speaker switch (U13) on/off control signal output terminal "H": on, "L": off
TX muting control signal output to the TA31103F (U6) "L": muting on
O
During sending data to handset, muting it
RX muting control signal output to the TA31103F (U6) "L": muting on
O
After receiving premble bits from handset muting it until data sent finished
I Detect signal input of the should dial in pulse mode or tone mode "H": pulse, "L": tone
I Detect signal input of the ringer coming
I Serial data input from the EEPROM (U4)
O Serial data output to the TB31202FN (U2), EEPROM (U4) and MC74HC595AF (U15, 16)
Serial data transfer clock signal output to the TB31202FN (U2), EEPROM (U4) and
O
MC74HC595AF (U15, 16)
I Slave selection input terminal Fixed at "H" in this set
O Transmit data output terminal
I Receive data input terminal
I Detect signal input of the phone line Normally: "L"
I System clock input terminal (4 MHz)
I System clock input terminal (4 MHz)
— Power supply terminal (+5V)
O Not used (open)
System reset signal input from the reset signal generator (U10) "L": reset
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
I Key scan signal input from the key matrix When key pressing: "L"
— Connected to power supply line (+5V)
Chip enable signal output to the TB31202FN (U2)
O
When PLL EN goes from "L" to "H", it load data from PLL DATA
Function
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