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Ic Pin Function Description - Sony ICF-CD830 Service Manual

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ICF-CD830/CD830L

5-12. IC PIN FUNCTION DESCRIPTION

• IC401 µPD789405AGC-023-8BT (SYSTEM CONTROL/LCD DRIVER)
Pin No.
Pin Name
1
VDD1
2
BIAS
3 - 5
VLC0 - 2
6
VSS1
7 - 10
COM0 - 3
11 - 26
SEG0 - 15
27 - 28
NC
29 - 30
VERSION0 - 1
31 - 32
NC
33 - 38
KEY0 - 5
39
AVDD
40
AVREF
41 - 47
KEY6 - 12
48
AVSS
49
AC IN
50
SENS
51
SENS2
52
SCOR
53
BUZZER
54
CLK
55
C XLAT
56
DATA
57
CD ON
58
CD LED
59
RADIO LED
60
BUZZER LED
61
SQSO
62
SQCK
63
SYSTM
64
XRST
65 - 66
NC
67
RESET
68
X2
69
X1
70
VSS0
71
VDD0
72
TX2
73
TX1
74
IC
75
CD OPEN
76
NC
77
AMUT
78
BEEP MUT
79
POWER ON
80
RADIO ON
22
I/O
–
System power supply
O
LCD bias output
–
LCD drive power supply
–
Ground
O
LCD drive common signal output
O
LCD drive segment signal output
–
Not used (connected to ground)
–
Initialization input
–
Not used (connected to ground)
I
Key detect signal input
–
analog power supply
–
A/D converter reference voltage
I
Key detect signal input
–
Analog ground
I
Power failure detect signal input (L=power failure)
I
CD SENS1 signal input
I
CD SENS2 signal input
I
Sub code sync signal input
O
Buzzer signal output
O
CD CLK signal output
O
CD XLAT signal output
O
CD DATA signal output
O
CD power control signal output (L=ON)
O
CD LED control signal output
O
RADIO LED control signal output
O
BUZZER LED control signal output
I
Sub code Q 80-bit serial input
O
Clock signal output for reading sub code Q 80-bit
O
CD muting signal output (H=ON)
O
CD reset signal output
–
Not used (connected to ground)
I
System reset signal input
O
Main system clock output
I
Main system clock input (4.19MHz)
–
Ground
–
System power supply
O
Sub system clock output
I
Sub system clock input (32kHz)
–
Not used (connected to ground)
I
CD lid OPEN detect signal input (L=CLOSE,H=OPEN)
–
Not used (connected to ground)
O
Audio circuit muting control signal output (L=ON)
O
BEEP sound muting control signal output (H=ON)
O
Standby control signal output for POWER AMP (H=ON)
O
Power control signal output for RADIO circuit (L=ON)
Description
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