5-3. Ic Pin Function Description - Sony ICF-CD820 Service Manual

5-3. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC401 µPD75304BGF-054-3B9 (SYSTEM CONTROLLER/LCD DRIVER)
Pin No. Pin Name
1 to 3 S12 to S14
4 to 6 SEG17 to SEG15
7 to 20 SEG14 to SEG1
21, 22 COM0, COM1
23, 24 COM2, COM3
25 BIAS
26 to 28 VLC0 to VLC2
29 POWER ON
30 CD ON
31 12H/24H
32 TRACKING
33
VSS
34
ALRAM
35 BAL B
36 CLOCK
37 XLAT
38 AC IN
39 SQCK
40 P02
41 SQSI
42 SENS
43 C IN
44 SCOR
45 DOOR
46 DATA
47 XRESET
48
AU MUT
49 BUZZER
50 RADIO ON
51 KEY IN1
52 KEY IN2
53 KEY IN3
54 VDD
55 XT1
56 XT2
57 NC
58 X1
59 X2
I/O
O
Segment drive signal output to the liquid crystal display (LCD901)
O Segment drive signal output to the liquid crystal display (LCD901)
O
Segment drive signal output terminal Not used (open)
O
Common drive signal output to the liquid crystal display (LCD901)
O
Common drive signal output terminal Not used (open)
O Liquid crystal display drive bias control output terminal
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
Power on/off control signal output and CD test mode 1 setting terminal
I/O At initial mode: valid/invalid selection of the CD test mode 1 (CD test mode 1 when "L" input)
At normal mode: main power on/off control signal output (power on when "L" output)
Power on/off control signal output and CD test mode 2 setting terminal
I/O At initial mode: valid/invalid selection of the CD test mode 2 (CD test mode 2 when "L" input)
At normal mode: CD power on/off control signal output (power on when "L" output)
Setting terminal for the time display (12/24-hour system) "L": 12H, "H": 24H
ICF-CD820; US, Canadian, Australian models and ICF-CD820L; UK model: fixed at "L",
I
ICF-CD820; AEP, Italian, Singapore models and ICF-CD820L; AEP, French models: fixed at
"H"
I Setting terminal for the auto tracking adjustment function "L": auto tracking (fixed at "L")
— Ground terminal
— Not used (open)
O
Tracking balance adjustment control signal output to the CXA1782BQ (IC501)
O
Serial data transfer clock signal output to the CXD2508AQ (IC502)
O Serial data latch pulse signal output to the CXD2508AQ (IC502)
I AC IN detection signal input terminal (for AC IN check) "H": AC IN OK
O Clock signal output for subcode Q data reading to the CXD2508AQ (IC502)
O
Not used (open)
I Subcode Q data input from the CXD2508AQ (IC502)
I Internal status detection signal input from the CXD2508AQ (IC502)
I Track jump count signal input from the CXD2508AQ (IC502)
I
Subcode sync (S0+S1) detection signal input from the CXD2508AQ (IC502)
I
CD lid open/close detect switch (S420) input terminal "L": open, "H": close
O
Serial data output to the CXD2508AQ (IC502)
O Reset signal output to the CXA1782BQ (IC501) and CXD2508AQ (IC502) "L": reset
O Audio line muting on/off control signal output terminal "L": muting on
O
Beep sound output terminal
O
Radio system power on/off control signal output terminal "L": radio on
I Key input terminal WAKE UP TRACK key input (S401)
I Key input terminal ALARM MODE key input (S402)
Key input terminal ALARM B key input (S403)
I
— Power supply terminal (+5V)
I Sub system clock input terminal (32 kHz)
O Sub system clock output terminal (32 kHz)
— Connected to power supply (+5V)
I Main system clock input terminal (4.19 MHz)
O Main system clock output terminal (4.19 MHz)
Function
– 29 –