Sony CDX-GT20W Service Manual page 32

CDX-GT20W/GT200/GT200E/GT200S/GT250S
IC501 MB90487APF-G-155E1 (SYSTEM CONTROL) (MAIN BOARD (3/3))
Pin No. Pin Name
1 AREASEL2
2 AREASEL1
3 AREASEL0
4 COL SW
5 BEEP
6 CYRIL SEL
7 NOSE SW
8 DIAG
9 VOL ATT
10 NCO
11 VSS
12 TU ATT
13 NS MASK
14 ILLUMI SEL1
15 ILLUMI SEL2
16 to 22 NCO
23 VCC5
24 EEP SIO
25 EEP CKO
26 AMP STB
27 LCD CE
28 LCD SO
29 LCD SCK
30 RDS ON
31 RE IN0
32 RE IN1
33 I2C CKO
34 I2C SIO
35 DAVDD
36 AVRH
37 DAVSS
38 QUALITY
39 VSM
40 KEY IN1
41 KEY IN0
42 VSS
43 RC IN0
44 to 48 NCO
49 MD0
50 MD1
51 MD2
32
I/O
I Destination setting pin
I Destination setting pin
I Destination setting pin
I Illumination color select signal input
O Beep signal output
I Cyril select signal input
I Front panel open/close detect signal input
I Power AMP status signal input
O Electronic volume attenuate control signal output
O Not used. (Open)
— Ground pin
O Tuner mute control signal output
O Noise mask signal output (GT200: AEP, UK model/GT200S only)
I Illumination voltage setting signal input 1
I Illumination voltage setting signal input 2
O Not used. (Open)
— Power supply pin (+3.3 V)
I/O EEPROM bus serial data input/output
O EEPROM bus serial clock output
O Power AMP satandby signal output
O LCD driver chip enable signal output
O LCD driver serial data signal output
O LCD driver serial clock signal output
O RDS ON signal output
I Rotary encoder signal input 0
I Rotary encoder signal input 1
O I2C bus serial clock signal output
I/O I2C bus serial data signal input/output
— A/D converter power supply pin (+3.3 V)
— A/D converter external reference power supply pin (+3.3 V)
— Ground pin
I Noise detect signal input
I S-meter voltage detect signal input
I Key signal input 1
I Key signal input 0
— Ground pin
I Rotary commander key signal input
O Not used. (open)
I Operation mode setting pin (Connect to VDD.)
I Operation mode setting pin (Connect to VDD.)
I Operation mode setting pin (Connect to VSS.)
Pin Description