Sony mex-1gp Service Manual page 38

MEX-1GP
• IC801 MB90488BPF-G-215E1 (SYSTEM CONTROL) (MAIN BOARD (3/3))
Pin No. Pin Name
1 ATT
2 to 4 NC
5 BEEP
6 VOL_ATT
7 ILL
8 to 10 NC
11 VSS
12 NC
13 NSMASK
14 NC
15 TU_ATT
16 MA_SL_RST
17 NC
18 SL_MA_DAT
19 MA_SL_DAT
20 SL_MA_CLK
21 RE_0
22 RE_1
23 VCC+3.3
24 EEP_SIO
25 EEP_SCK
26 SA_CLK
27 LCD_CE
28 LCD_SO
29 LCD_SCK
30 MA_SL_REQ
31 STB
32 AUX
33 IIC_SCK
34 IIC_SIO
35 VCC+3.3
36 AVRH+3.3
37 AVSS
38 KEY_IN0
39 KEY_IN1
40 SA_DATA
41 RC_IN0
42 VSS
43 NC
44 QUALITY
45 VSM
46 DST_SEL
47 KEY_ACK
48 NC
49 MD0
50 MD1
51 MD2
52 NC
53 BU_IN
38
I/O
O Audio mute signal output
— Not used (Open)
O Beep signal output
O Electronic volume ATT control signal output
I ILL signal input
— Not used (Open)
— Ground
— Not used (Open)
O NS mask signal output
— Not used (Open)
O Tuner mute signal output
O MA-SL reset signal output
— Not used (Open)
I SL-MA serial data input
O MA-SL serial data output
I SL-MA serial transfer clock input
I Rotary encoder (Volume) signal input
I Rotary encoder (Volume) signal input
— Power supply pin (+3.3V)
I/O TU-EEPROM serial data input/output
O TU-EEPROM serial transfer clock output
O Spectrum analyzer serial transfer clock output
O LCD driver chip enable output
O LCD driver serial data output
O LCD driver serial transfer clock output
O MA-SL request signal output
O Power AMP/RDS power standby signal output
O Bus audio ON signal output
O IIC bus serial clock output
I/O IIC bus serial data input/output
— A/D converter power supply pin (+3.3V)
— A/D converter reference voltage supply pin (+3.3V)
— Ground
I Key signal input
I Key signal input
I Spectrum analyzer serial data input
I Remote control signal input
— Ground
— Not used (Open)
I Tuner noise level input
I S-meter signal input
I Destination setting pin
I Key acknowledgment detect signal input
— Not used (Open)
I Operation mode setting pin
I Operation mode setting pin
I Operation mode setting pin
— Not used (Open)
I Back-up power supply detect signal input
Pin Description