Diagrams; Ic Pin Description - Sony WM-FX271FP Service Manual

WM-FX271FP

5-1. IC PIN DESCRIPTION

• IC701 µPD17072GB-559-1A7 (SYSTEM CONTROL/LCD DRIVE)
Pin No. Pin Name
1 INIT
2, 3 NC
4 MEGA BASS
5 RADIO-ON
6 – 8 KEY OUT1 – 3
9 NC
10, 11 KEY IN1, 3
12, 13 BTT-REF1, 2
14 MUTE OUT
15 SD
16 BAND
17 HOLD
18 GND
19 EO
20 VCO (AM)
21 VCO (FM/TV)
22 VDD2
23 VDD1
24 XO
25 XI
26 VDD5
27 VDD3
28, 29 CAP1, 2
30 VDD4
31 – 34 COM0 – 3
35 – 49 LCD0 – 14
50 CE
51 TAPE ON
52 BEEP
53 NC
54 KEY IN2
55 NC
56 KEY IN4
10
SECTION 5

DIAGRAMS

I/O
O Initialize output
— Not used.
O MEGA BASS ON/OFF output (L: ON, H: OFF)
O Radio circuit power control output
O Key matrix output 1 – 3
— Not used.
I Key input 1, 3
I Reference voltage input for battery voltage check.
O Mute output (Mute ON: L, Mute OFF: input)
I SD (with local) signal input
O Radio band select output (AM: L, FM: input)
I Key hold input (Key input effect: L, Key input ineffect: H)
— Ground
O PLL error out output
I VCO (AM) input
I VCO (FM) input
— Voltage regulator for PLL.
— Power supply pin
— Crystal oscillator output (75 kHz)
— Crystal oscillator input (75 kHz)
— Voltage regulator for oscillation circuit.
— Power supply for LCD driver.
— Stabilized capacitor connection of crystal oscillation power supply.
— Power supply for LCD driver.
O LCD driver common output
O LCD driver output
I L: Clock stop, H: Normally operation
I At TAPE ON: H
O BEEP output
— Not used.
I Key input 2
— Not used.
I Key input 4
Pin Description