Semiconductor Data - Kenwood TK-360G Service Manual

CIRCUIT DESCRIPTION/SEMICONDUCTOR DATA
8. CONTROL SYSTEM
Keys and channel selector circuit.
The signal from keys and channel selector input to
microprocessor directly as shown in fig. 10.
Channel selector

SEMICONDUCTOR DATA

LCD Driver : LC75823W (Display UNIT IC501)
(TK-370G only)
Block diagram
COM1 COM2 COM3
V 1
COMMON
DD
DRIVER
V 2
DD
INH
CLOCK
OSC
GENERATOR
IC13
25 EN1
CPU
16
EN2
27
EN3
TK-360G
CN1
CN501
TK-370G
Fig. 10 Control system
S52 S51 S1
LATCH & DRIVER
SHIFT REGISTER
ADDRESS
DETECTOR
DI CL CE V V
DD SS
TK-360G/370G
5M
3
PTT
PTT
47k
SW
87
KEYAD
47k
100k
2
1 3 A
4 5 6 B
7 8 9 C
∗
0 # D
Pin function
Pin No. Name I/O Active
Segment output for displaying data
1-52 S1-S52 O -
transferred form serial data.
Common drive output.
53-55 COM1-COM4 O -
Frame frequency fo=(fosc/384)Hz
56 VDD - -
The display to turn off
57 INH I L INT=L : Turn off
INT=H : Turn on
Apply 2/3 the LCD drive bias voltage
58 VDD1 I - form outside. If 1/2 the bias is applied,
connect to VDD2.
Apply 1/3 the LCD drive bias voltage
59 VDD2 I - form outside. If 1/2 the bias is applied,
connect to VDD1.
60 VSS - -
61 OSC I/O - Oscillation terminal
Chip enable. Serial data transfer terminal.
62 CE I H
Connected to the microprocessor.
Synchronizing clock. Serial data transfer terminal.
63 CL I
Connected to the microprocessor.
Trnsfer data. Serial data transfer terminal.
64 DI I -
Connected to the microprocessor.
LAMP
SW
MONI
SW
Function
21