Ic Pin Function Description - Sony ICF-M770L Service Manual

ICF-M770L/M770S/M770SL
• Waveforms
– KEY Board –
1 Q106 (Base), Q111 (Collector)
250 mVp-p
380 ns
2 Q106 (Collector)
5.6 Vp-p
380 ns
3 IC104 wf (XOUT)
1.7 Vp-p
13.3 µs

5-7. IC PIN FUNCTION DESCRIPTION

• KEY BOARD IC104 µPD17027GB-036-1A7
(SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL)
Pin No. Pin Name I/O
1 KS0 O Key source signal output
2 MUTE O Muting on/off control signal output "L": muting on
Band selection signal output "L": SW/MW/LW, "H": FM
3 BPF O
Used for the ICF-M770S/770SL (ICF-M770L: Not used)
4 (MW/LW)/SW O Band selection signal output "L": MW/LW, "H": SW
5 POWER O Power on/off control signal output for the tuner section "H": radio power on
6 to 9 KS1 to KS4 O Key source signal output
10 to 13 KR0 to KR3 I Key return signal input
14 TUNED I Tuning detection signal input "L": tuned
15 AC DET I AC voltage detection signal input "L": AC detected
16 LIGHT O LED drive signal output of the liquid crystal display back light "H": LED on
17 HOLD O HOLD switch input terminal "L": hold on
18 GND — Ground terminal
19 EO O PLL frequency synthesizer charge pump output
20 VCOL I SW/MW/LW VCO input terminal
21 VCOH I FM VCO input terminal
22 REG0 O Voltage regulator output terminal for the PLL
23 VDD — Power supply terminal (+3V)
24 XOUT O System clock output terminal (75 kHz)
25 XIN I System clock input terminal (75 kHz)
26 REG1 O Voltage regulator output terminal for the oscillator circuit
27 REGLCD0 — Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply
28 CAPLCD0 — Connection terminal of doubler circuit capacitor
29 CAPLCD1 — Connection terminal of doubler circuit capacitor
30 REGLCD1 — Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply
31 to 34 COM0 to COM3 O
Common drive signal output to the liquid crystal display
35 to 47 LCD0 to LCD12 O
Segment drive signal output to the liquid crystal display
48, 49 LCD13, LCD14 O
Segment drive signal output to the liquid crystal display Not used
50 VDET1 I Voltage detection signal input "L": 2.5V or less
51 CEDET I Voltage detection signal input "L": 2.5V or less
52 BEEP O Beep sound drive signal output
53 VDET2 I Voltage detection signal input "L": 2.9V or less
54 INITIAL1 I Model setting input terminal "L": ICF-M770L, "H": ICF-M770S/M770SL
55
INITIAL2 I Model setting input terminal "L": ICF-M770L/M770S, "H": ICF-M770SL
56
AM/(FM/TV) O Band selection signal output "L": FM, "H": SW/MW/LW
14 14
Description