Read Sony SRF-PSY04 Service Manual online
– 15 –
4-4.
IC PIN FUNCTION DESCRIPTION
•
Pin No.
Pin Name
I/O
Description
1
PB2
I
Key return signal input for the key matrix
2 to 5
PC0 to PC3
O
Key scan signal output for the key matrix
6
BEEP
O
Beep sound drive signal output terminal
7
BAND
O
FM/AM band selection signal output terminal “L”: FM, “H”: AM
8
BCHK
—
Not used (open)
9
POWER
O
Power on/off control signal output for the radio system power supply “H”: power on
10
MUTE
O
Muting on/off control signal output to the headphone amplifier (IC2) “L”: muting on
11
CE
I
Power failure detection signal input from the voltage detect (IC102) Normally: “H”
12
XOUT
O
System clock output terminal (75 kHz)
13
XIN
I
System clock input terminal (75 kHz)
14
VDD
—
Power supply terminal (+3V)
15
GND
—
Ground terminal
16
EO
O
PLL error signal output terminal
17
VREG
—
Power supply terminal (connected to the coupling capacitor)
18
VCOH
I
FM VCO input terminal
19
VCOL
I
AM VCO input terminal
20 to 28
LCD8 to LCD0
O
Segment drive signal output to the liquid crystal display (LCD101)
29 to 32
COM3 to COM0
O
Common drive signal output to the liquid crystal display (LCD101)
33
VLCD1
—
34
C1
—
35
C0
—
36
VLCD0
—
37, 38
PB0, PB1
I
Key return signal input for the key matrix
KEY BOARD IC101
µ
PD17015GS-520-GJG
(SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL)
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
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