34
CDX-F5510/F5510X/F5550EE
• IC801 MB90487APF-G-125-BNDE1 (SYSTEM CONTROL) (MAIN BOARD (3/3))
Pin No. Pin Name I/O Pin Description
1ATT O Audio mute control signal output
2 to 4 NC — Not used in this set. (Open)
5 BEEP O Beep signal output to power amp IC
6VOL ATT O Electrical volume ATT control output
7 ILL I Illumination check signal input for auto dimmer
8 to 10 NC — Not used in this set. (Open)
11 VSS — Ground pin
12 to 14 NC — Not used in this set. (Open)
15 TU ATT O Tuner mute control output
16 to 20 NC — Not used in this set. (Open)
21 RE 0 I Rotary encoder signal input 0
22 RE 1 I Rotary encoder signal input 1
23 VCC+3.3 — Power supply pin (+3.3 V)
24 EEP SIO I/O Serial data signal input/output for EEPROM communication
25 EEP SCK O Serial clock signal output for EEPROM communication
26 SA CLK O Serial clock signal output for spectrum analyzer to electronic volume IC
27 LCD CE O Chip enable signal output to LCD driver IC Flash: serial in
28 LCD SO O Serial data signal output to LCD driver IC Flash: UART serial out
29 LCD SCK O Serial clock signal output to LCD driver IC
30 NC — Not used in this set. (Open)
31 STB O Standby signal output to power amp IC
32 AUX O Not used in this set. (Open)
33 IIC SCK O IIC bus serial clock signal output
34 IIC SIO I/O IIC bus serial data signal input/output
35 VCC+3.3 — Power supply pin (+3.3 V) (for A/D converter)
36 AVRH+3.3 — External reference power supply (+3.3 V) (for A/D converter)
37 AVSS — Ground pin (for A/D converter)
38, 39 KEY IN0, 1 I Key signal input
40 SA DATA I Serial data signal input to electronic volume IC
41 RC IN0 I Rotary commander key signal input
42 VSS — Ground pin
43, 44 NC — Not used in this set. (Fixed at “L”.)
45 VSM I S meter voltage detect signal input
46 DST SEL I Destination select pin
47 KEY ACK I Key acknowledge detect signal input
48 NC — Not used in this set. (Open)
49, 50 MD0, 1 I Input for operation mode designation (Fixed at “H”.)
51 MD2 I Input for operation mode designation (Fixed at “L”.)
52 NC — Not used in this set. (Open)
53 BU IN I Back up power supply detect signal input
54 OPEN REQ I Open REQ signal input
55 NC — Not used in this set. (Open)
56 DIAG I Condition input from power amp IC
57 NC — Not used in this set. (Open)
58 UNI SI I Serial data signal input
59 UNI SO O Serial data signal output
60 UNI SCK O Serial clock signal output
61 BUS ON O Bus on signal output
62 SYS RST O System reset signal output
63 TEL ATT I TEL ATT detect input
64 ACC IN I Accessory power supply detect signal input
65 SIRCS I Remote control signal (infrared rays) input
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