Sony CDX-S2250 Service Manual page 32

CDX-S2250/S2250S
IC501 MB90487A11 (SYSTEM CONTROL) (MAIN BOARD (3/4))
Pin No. Pin Name
1 AREA SEL2
2 AREA SEL1
3 AREA SEL0
4 COL SW
5 BEEP
6 NCO
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 NCO
17 NCO
18 NCO
19 NCO
20 NCO
21 NCO
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 NCO
32 NCO
33 I2C SCK
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 NCO
45 NCO
46 NCO
47 NCO
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
O Not used
I Front panel open/close detect signal input
I Power AMP status signal input
O Electronic volume attenuate control signal output
O Not used
— Ground
O Tuner mute control signal output
O Noise mask signal output
I Illumination voltage setting pin
I Illumination voltage setting pin
O Not used
O Not used
O Not used
O Not used
O Not used
O Not used
O Not used
— Power supply pin (+3.3V)
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 output
O LCD driver serial data output
O LCD driver serial clock output
O RDS ON signal output
O Not used
O Not used
O I2C bus serial clock output
I/O I2C bus serial data input/output
— A/D converter power supply pin (+3.3V)
— A/D converter reference power supply pin (+3.3V)
— Ground
I Noise detect signal input
I S-meter voltage detect signal input
I Key signal input
I Key signal input
— Ground
I Rotary commander key signal input
O Not used
O Not used
O Not used
O Not used
O Not used
I Operation mode setting pin
I Operation mode setting pin
I Operation mode setting pin
Pin Description