HCD-EC68/EC78
42
PANEL BOARD IC301 MB90803PF-G-135E1 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
SEG32
O
Segment drive signal output to the liquid crystal display
2
O-AMP-ON
O
Relay drive signal output terminal (for speaker)
3
O-POWER
O
Main power on/off control signal output terminal "H": on
4
O-CD-ON
O
CD power on/off control signal output terminal "H": on
5 to 7
I-3CD-SW3/O-CDM-
CLOSE, I-3CD-SW2/
NC, I-3CD-SW1/
O-CDM-OPEN
I
Detection switch input from the CD mechanism deck
8
O-3CD-M1+/
O-CDM-M1+
O
Motr drive signal output terminal Not used
9
I-RMC
I
Remote control signal input from the remote control receiver
10
O-3CD-M1-/
O-CDM-M1-
O
Motr drive signal output terminal Not used
11, 12
O-3CD-M2+/NC,
O-3CD-M2-/NC
O
Motr drive signal output to the CD mechanism deck
13
X0A
I
Sub system clock input terminal (32.768 kHz)
14
X1A
O
Sub system clock output terminal (32.768 kHz)
15
VCC
-
Power supply terminal (+3.1V)
16
VSS
-
Ground terminal
17 to 20
I/O-CD-BUS0 to
I/O-CD-BUS3
O
Serial data output to the CD-MP3 processor
21
I-3CD-CHACK
I
Disc chucking detection switch input from the CD mechanism deck
22
I-3CD-STOCK
I
Disc stocking detection switch input from the CD mechanism deck
23
O-DR-MUTE
O
Muting signal output to the motor/coil driver
24
I-REQ
I
Request signal input from the CD-MP3 processor
25
O-CD-BUCK
O
Serial data transfer clock signal output to the CD-MP3 processor
26
O-CD-CCE
O
Chip enable signal output to the CD-MP3 processor
27
O-CD-RST
O
System reset signal output to the CD-MP3 processor "L": reset
28
O-LED-STBY
O
LED drive signal output terminal for STANDBY indicater
29
I-USB-TXD/I-DMP-TXD
I
Serial data input terminal Not used
30
I-USB-DO/
I-DMP-5V-DET
I
Power voltage detection signal input terminal Not used
31
O-USB-RXD/O-DMP-
RXD
O
Serial data output terminal Not used
32
AVCC
-
Power supply terminal (+3.1V)
33
I-TU-DO
I
Serial data input from the AM/FM DET
34
O-USB-DI/5V-ON/
O-TP-REC-MUTE
O
Muting signal output to the REC muting circuit
35
AVSS
-
Ground terminal
36
I-P-MONI
I
Power monitor signal input terminal
Front panel key input terminal (A/D input)
Power monitor signal input terminal
Tape syate detection signal input terminal
System wake up signal input terminal
Hold signal input terminal
Subcode block sync signal input from the CD-MP3 processor
Ground terminal
DMPORT detection signal input terminal/reset signal output terminal Not used
Model setting terminal
47
I-SUFFIX
I
Suf
fi
x setting terminal
48
I-CD-CLOSE_OPEN/
NC
I
CD table open/close detection signal input terminal
49
I/O-I2C-DATA
I/O
Two-way serial data bus with the electrical volume
50
I/O-I2C-CLK
O
Serial data transfer clock signal output to the electrical volume
51 to 53
MD2 to MD0
-
Not used
54
I-RST
I
Reset signal input from the voltage detect "L": reset
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
55
O-TU-CE
O
Chip enable signal output to the FM/AM DET
56
O-TU-CLK
O
Serial data transfer clock signal output to the FM/AM DET
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