Ic Pin Function Description - Sony SPP-A2770 Service Manual

6-14. IC PIN FUNCTION DESCRIPTION

• BASE MAIN BOARD IC301 SB875064W-5W61 (SYSTEM CONTROLLER)
Pin No. Pin Name
1 SS SPI CLK
2 LCD SDA
3 LCD CS
4 LCD SCL
5 HOOK SW DET
6
OFF HOOK CONT
7 PWM1
LED CONT
8
(LCD)
9 VDD2
10 VSS2
FLASH WRITE
11
SELECT
12 JOG PUSH
13 to 18 ROW1 to ROW6
19 LCD RS
20, 21 COL1, COL2
22 JOG A
23 JOG B
24 to 26 COL3 to COL5
27 DSP SC
28 DSP HRNW
29 DSP CSN
30 DSP ACKN
31 DSP SDO
32 DSP SDI
33
DSP PWR DOWN
34 DSP RESET
35 VSS3
36 VDD3
37 E2PROM SCL
38 E2PROM SDA
39 PC5
40 LED (IN USE)
41 PC3
ANTENNA
42
SELECT B
ANTENNA
43
SELECT A
44 PC0
SS PWR DOWN
45
CONT
46 SS RESET
47 SS SPI EN
48 LED (ANS)
I/O
O Serial data transfer clock signal output to the RF unit (RF271)
O Two-way data bus with the liquid crystal display module Not used (open)
O Chip select signal output to the liquid crystal display module "L" active
O Serial data transfer clock signal output to the liquid crystal display module Not used (open)
I Hook on/off detection signal input "H": hook on, "L": hook off
O Hook on/off control signal output
O Not used (open)
LED drive signal output of the liquid crystal display module back light
O
"L": LED on Not used (open)
— Power supply terminal (+5V)
— Ground terminal
I Not used (fixed at "H")
PUSH ENTER switch (S701) input terminal "L" input when key pressing
I
Not used (open)
I Key data input to the key matrix "L" input when key pressing
O Reset signal output to the liquid crystal display module Not used (open)
O Key scan output to the key matrix "L" output when key waiting
I Jog dial pulse input of the rotary encoder (A phase input) Not used (open)
I Jog dial pulse input of the rotary encoder (B phase input) Not used (open)
O Key scan output to the key matrix "L" output when key waiting
O Serial data transfer clock signal output to the DSP (IC402)
O Data read/write selection signal output to the DSP (IC402)
O Chip select signal output to the DSP (IC402) "L" active
I Acknowledge signal input from the DSP (IC402) "L" active
O Serial data output to the DSP (IC402)
I Serial data input from the DSP (IC402)
O Power down control signal output to the DSP (IC402)
O Reset signal output to the DSP (IC402) "L": reset
— Ground terminal
— Power supply terminal (+5V)
O Serial data transfer clock signal output to the EEPROM (IC303)
I/O Two-way data bus with the EEPROM (IC303)
Not used (open)
I
O LED drive signal output of the IN USE indicator (D704) "L": LED on
O Not used (open)
O Main antenna on/off control signal output "L": antenna on
O Sub antenna on/off control signal output "L": antenna on
O Not used (open)
O Power down control signal output to the RF unit (RF271)
O Reset signal output to the RF unit (RF271)
O Enable signal output to the RF unit (RF271)
O LED drive signal output of the ANSWER ON/OFF indicator (D705) "L": LED on
Description
"L": hook off, "H": hook on
"L": data write, "H": data read
"L": power down
"H": power down
"L": reset
"L" active
SPP-A2770
Not used (open)
39