Sony ICF-CD855V - Page 32

32
ICF-CD855V
MAIN BOARD IC401 µPD789477GC-A39-8BT (SYSTEM CONTROLLER)
Pin No. Pin Name
I/O
Description
1, 2 NC — Not used
3 to 5 VLC2 to VLC0 — 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 FSEQ I CD synchronizing signal detection signal input from the digital signal processor
40 CD OPEN I CD lid open/close detect switch input terminal “L”: CD lid is closed, “H”: CD lid is opened
41 DRF I CD focus on/off detection signal input from the digital signal processor
42 VERSION I Setting input terminal for destination
43 to 46 KEY3 to KEY0 I Key input terminal (A/D input)
47 AVSS — Ground terminal (for analog system)
48 R CLK O PLL serial data transfer clock signal output to the FM/AM PLL
49 AC IN I Power detection signal input terminal when connected AC power adapter (A/D input)
50 WRQ I CD interruption signal input from the digital signal processor
51 MUTE O Tuner muting on/off control signal output to the FM/AM PLL “L”: muting on
52 BUZZER O Beep sound signal output terminal
53 CD DATA-IN I Serial data input from the digital signal processor
54 CD DATA O Serial data output to the digital signal processor
55 CD CLK O Serial data transfer clock signal output to the digital signal processor
56 CD CE O Chip enable signal output to the digital signal processor
57 R DATA O PLL serial data output to the FM/AM PLL
58 XRST O System reset signal output to the digital signal processor “L”: reset
59 R CE O PLL chip enable signal output to the FM/AM PLL
60 POWER ON O
Power on/off control signal output terminal for the power amplifier
“L”: standby mode, “H”: power amplifier on
61
ALARM A BUZ
O LED drive signal output terminal for ALARM A BUZZER indicator
62
ALARM A RADIO
O LED drive signal output terminal for ALARM A RADIO indicator
63
ALARM A CD
O LED drive signal output terminal for ALARM A CD indicator
64 VOL CLK O Serial data transfer clock signal output to the electrical volume
65 VOL DAT O Serial data output to the electrical volume
66
ALARM B BUZ
O LED drive signal output terminal for ALARM B BUZZER indicator
67
ALARM B RADIO
O LED drive signal output terminal for ALARM B RADIO indicator
68
ALARM B CD
O LED drive signal output terminal for ALARM B CD indicator
69 IC — Ground terminal
70 XT1 I Sub system clock input terminal (32.768 kHz)
71 XT2 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 from the reset signal generator “L”: reset For several hundreds msec.
after the power supply rises, “L” is input, then it changes to “H”
77 AMUTE O Audio muting on/off control signal output terminal “L”: muting on
78 RADIO ON O Power on/off control signal output for the tuner section “L”: tuner power on
79 CD ON O Power on/off control signal output for the CD section “L”: CD power on
80 NC I Not used
• IC Pin Function Description