Ic Pin Function Description - Sony ICF-CD830 Service Manual

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