Ic Pin Function Description - Sony ICF-CD863V Service Manual

ICF-CD863V

5-13. IC PIN FUNCTION DESCRIPTION

• LCD BOARD IC401 µPD789477GC-A17-8BT (SYSTEM CONTROLLER)
Pin No. Pin Name
1, 2 NC
3 to 5 VLC0 to VLC2
6 to 9 COM0 to COM3
10 to 37 SEG0 to SEG27
38 AVDD
39 CD OPEN
40 VERSION
41 FSEQ
42
AUTO DIMMER
43 to 46 KEY0 to KEY3
47 AVSS
48 CD ON
49 AC IN
50 WRQ
51 BUZZERMUTE
52 BUZZER
53 CE CD/RADIO
54 DATA CD/RADIO
55
CLK CD/RADIO
56 DATA-IN CD
57 DRF
58 XRST
59 RADIO ON
60 POWER ON
61 A MUT
62 HP SW
63 HP ON
64 VR CLK
65 VR DATA
66 NC
67 BACK LIGHT 0
68 BACK LIGHT 1
69 IC
70 XT1
71 XT2
72 VDD0
73 VSS0
74 X1
75 X2
76 RESET
77 NAP LED
78 CD LED
79 RADIO LED
80 BUZZER LED
30
I/O
— Not used
— Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
O Common drive signal output to the liquid crystal display
O Segment drive signal output to the liquid crystal display
— Power supply terminal (+3.3V) (analog system)
I CD lid open/close detection signal input terminal "L": CD lid is closed, "H": CD lid is opened
I Destination setting terminal Not used
I Synchronizing signal detection signal input from the digital signal processor
I Auto Dimmer signal input
I Key input terminal (A/D input)
— Ground terminal (analog system)
O Power on/off control signal output for the CD +3.3V power supply "L": CD power on
I Power failure detection signal input terminal "L": power failure, "H": power on
I Interruption detection signal input from the digital signal processor
O Buzzer sound muting on/off control signal output "L": muting on
O Buzzer sound drive signal output
O Chip enable signal output to the digital signal processor and FM/AM PLL
O Serial data output to the digital signal processor and FM/AM PLL
O Serial data transfer clock signal output to the digital signal processor and FM/AM PLL
I Serial data input from the digital signal processor
I Focus on/off detection signal input from the digital signal processor
O Reset signal output to the digital signal processor "L": reset
O Power on/off control signal output for the radio +3.3V power supply "L": radio power on
O Power amplifier on/off control signal output "L": standby mode, "H": power amplifier on
O Audio line muting on/off control signal output "L": muting on
Connection detection signal input of the headphone jack
I
"L": headphone connected, "H": no headphone
O Headphone on/off control signal output "L": headphone on
O Volume clock signal output
O Volume data output
— Not used
O LED drive signal output of the liquid crystal display back light "L": Back light High
O LED drive signal output of the liquid crystal display back light "L": Back light Mid
— Internal connection terminal
I Sub system clock input terminal (32.768 kHz)
O Sub system clock output terminal (32.768 kHz)
— Power supply terminal (+3.3V)
— Ground terminal
I Main system clock input terminal (4.19 MHz)
O Main system clock output terminal (4.19 MHz)
System reset signal input "L": reset
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
O LED drive signal output of the NAP "L": LED on
O LED drive signal output of the CD "L": LED on
O LED drive signal output of the RADIO "L": LED on
O LED drive signal output of the BUZZER "L": LED on
Description