Sony CDX-F5510 Service Manual page 34

CDX-F5510/F5510X/F5550EE
• IC801 MB90487APF-G-125-BNDE1 (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 to 14 NC
15 TU ATT
16 to 20 NC
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 NC
31 STB
32 AUX
33 IIC SCK
34 IIC SIO
35 VCC+3.3
36 AVRH+3.3
37 AVSS
38, 39 KEY IN0, 1
40 SA DATA
41 RC IN0
42 VSS
43, 44 NC
45 VSM
46 DST SEL
47 KEY ACK
48 NC
49, 50 MD0, 1
51 MD2
52 NC
53 BU IN
54 OPEN REQ
55 NC
56 DIAG
57 NC
58 UNI SI
59 UNI SO
60 UNI SCK
61 BUS ON
62 SYS RST
63 TEL ATT
64 ACC IN
65 SIRCS
34
I/O
O Audio mute control signal output
— Not used in this set. (Open)
O Beep signal output to power amp IC
O Electrical volume ATT control output
I Illumination check signal input for auto dimmer
— Not used in this set. (Open)
— Ground pin
— Not used in this set. (Open)
O Tuner mute control output
— Not used in this set. (Open)
I Rotary encoder signal input 0
I Rotary encoder signal input 1
— Power supply pin (+3.3 V)
I/O Serial data signal input/output for EEPROM communication
O Serial clock signal output for EEPROM communication
O Serial clock signal output for spectrum analyzer to electronic volume IC
O Chip enable signal output to LCD driver IC Flash: serial in
O Serial data signal output to LCD driver IC Flash: UART serial out
O Serial clock signal output to LCD driver IC
— Not used in this set. (Open)
O Standby signal output to power amp IC
O Not used in this set. (Open)
O IIC bus serial clock signal output
I/O IIC bus serial data signal input/output
— Power supply pin (+3.3 V) (for A/D converter)
— External reference power supply (+3.3 V) (for A/D converter)
— Ground pin (for A/D converter)
I Key signal input
I Serial data signal input to electronic volume IC
I Rotary commander key signal input
— Ground pin
— Not used in this set. (Fixed at "L".)
I S meter voltage detect signal input
I Destination select pin
I Key acknowledge detect signal input
— Not used in this set. (Open)
I Input for operation mode designation (Fixed at "H".)
I Input for operation mode designation (Fixed at "L".)
— Not used in this set. (Open)
I Back up power supply detect signal input
I Open REQ signal input
— Not used in this set. (Open)
I Condition input from power amp IC
— Not used in this set. (Open)
I Serial data signal input
O Serial data signal output
O Serial clock signal output
O Bus on signal output
O System reset signal output
I TEL ATT detect input
I Accessory power supply detect signal input
I Remote control signal (infrared rays) input
Pin Description