Read Sony ICF-CD853V Service Manual online
25
ICF-CD853V
5-12.
IC PIN FUNCTION DESCRIPTION
•
LCD BOARD IC401
µ
PD789477GC-A11-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1, 2
NC
—
Not used
3 to 5
VLC0 to VLC2
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
6 to 9
COM0 to COM3
O
Common drive signal output to the liquid crystal display
10 to 37
SEG0 to SEG27
O
Segment drive signal output to the liquid crystal display
38
AVDD
—
Power supply terminal (+3.3V) (analog system)
39
CD OPEN
I
CD lid open/close detection signal input terminal “L”: CD lid is closed, “H”: CD lid is opened
40
VERSION
I
Destination setting terminal Not used
41
FSEQ
I
Synchronizing signal detection signal input from the digital signal processor
42
NC
—
Not used
43 to 46
KEY1 to KEY4
I
Key input terminal (A/D input)
47
AVSS
—
Ground terminal (analog system)
48
CD ON
O
Power on/off control signal output for the CD +3.3V power supply “L”: CD power on
49
AC IN
I
Power failure detection signal input terminal “L”: power failure, “H”: power on
50
WRQ
I
Interruption detection signal input from the digital signal processor
51
BUZZERMUTE
O
Buzzer sound muting on/off control signal output “H”: muting on
52
BUZZER
O
Buzzer sound drive signal output
53
LAT CD/RADIO
O
Chip enable signal output to the digital signal processor and FM/AM PLL
54
DATA CD/RADIO
O
Serial data output to the digital signal processor and FM/AM PLL
55
CLK CD/RADIO
O
Serial data transfer clock signal output to the digital signal processor and FM/AM PLL
56
DATA-IN CD
I
Serial data input from the digital signal processor
57
DRF
I
Focus on/off detection signal input from the digital signal processor
58
XRST
O
Reset signal output to the digital signal processor “L”: reset
59
RADIO ON
O
Power on/off control signal output for the radio +3.3V power supply “L”: radio power on
60
POWER ON
O
Power amplifier on/off control signal output “L”: standby mode, “H”: power amplifier on
61
A MUT
O
Audio line muting on/off control signal output “L”: muting on
62
HP SW
I
Connection detection signal input of the headphone jack
“L”: headphone connected, “H”: no headphone
“L”: headphone connected, “H”: no headphone
63
HP ON
O
Headphone on/off control signal output “L”: headphone on
64 to 66
NC
—
Not used
67
BACK LIGHT 0
O
LED drive signal output of the liquid crystal display back light “L”: all LEDs on
68
BACK LIGHT 1
O
LED drive signal output of the liquid crystal display back light “L”: half LEDs on
69
IC
—
Internal connection terminal
70
TX1
I
Sub system clock input terminal (32.768 kHz)
71
TX2
O
Sub system clock output terminal (32.768 kHz)
72
VDD0
—
Power supply terminal (+3.3V)
73
VSS0
—
Ground terminal
74
X1
I
Main system clock input terminal (4.19 MHz)
75
X2
O
Main system clock output terminal (4.19 MHz)
76
RESET
I
System reset signal input “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
77
NAP LED
O
LED drive signal output of the NAP “L”: LED on
78
CD LED
O
LED drive signal output of the CD “L”: LED on
79
RADIO LED
O
LED drive signal output of the RADIO “L”: LED on
80
BUZZER LED
O
LED drive signal output of the BUZZER “L”: LED on
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