Semiconductor Data - Kenwood TK-260G Service Manual

8. CONTROL SYSTEM
Keys and channel selector circuit.
The signal from the keys and channel selector are directly
input to the microprocessor, as shown in fig. 10.
Channel selector
25
EN1
16 EN2
27
EN3
TK-260G
TK-270G

SEMICONDUCTOR DATA

LCD Driver : LC75823W (Display UNIT IC501)
(TK-270G only)
Block diagram
V 1
DD
V 2
DD
INH
OSC
Pin function
Pin No. Name
1-52 S1-S52
53-55 COM1-COM3 O
56 VDD
57 INH
58 VDD1
59 VDD2
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CIRCUIT DESCRIPTION/SEMICONDUCTOR DATA
3
PTT
PTT
SW
87
KEYAD
IC13
-COM
CN1
CN501
1 2
4 5
7 8
∗
0
Fig. 10 Control system
COM1 COM2 COM3 S52 S51
COMMON
LATCH & DRIVER
DRIVER
SHIFT REGISTER
CLOCK ADDRESS
GENERATOR DETECTOR
DI CL CE
I/O Active Function
Segment output for displaying data
O -
transferred form serial data.
Common drive output.
-
Frame frequency fo=(fosc/384)Hz
- -
The display to turn off
I L INT=L : Turn off
INT=H : Turn on
Apply 2/3 the LCD drive bias voltage
I - from outside. If 1/2 the bias is applied,
connect to VDD2.
Apply 1/3 the LCD drive bias voltage
I - from outside. If 1/2 the bias is applied,
connect to VDD1.
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Pin No.
60
61
62
63
5M
47k
64
LAMP
47k
SW
UPB1509GV (IC301)
MONI
100k
SW
Pin connection diagram
1
2
3 A
6 B
3
9 C
4
# D
Block diagram
IN
IN
Pin Fanction
S1
Pin Pin Applied Pin
No. name voltage voltage
1 V
CC1
2 IN
3 IN
V V
4 GND
DD SS
5 SW1
6 SW2
7 OUT
8 V
CC2
TK-260G/270G
Name I/O Active
VSS - -
OSC I/O - Oscillation terminal
Chip enable. Serial data transfer terminal.
CE I H
Connected to the microprocessor.
Synchronizing clock. Serial data transfer terminal.
CL I
Connected to the microprocessor.
Trnsfer data. Serial data transfer terminal.
DI I -
Connected to the microprocessor.
5
6
7
8
D Q D Q
CLK CLK
Q Q
SW1
Functions and uses
2.2-2.5 - Power supply voltage pin for the input amplifier section and
division circuit. Connect a bypass capacitor to this pin to reduce
the high-frequency impedance with the ground (for example, 1000 pF).
- 1.7-4.95 Signal input pin. Connect a coupling capacitor to this pin for
DC cutting with an external circuit (for example, 1000 pF).
- 1.7-4.95 Input signal bypass pin. Connect a bypass capacitor to this
pin to reduce the high-frequency impedance with the ground
(for example, 1000 pF).
0 - Ground pin. Connect it with the ground pattern. The ground
pattern on the PC board should be wide enough to minimize
impedance.
H/L - Division ratio setting pin. The division ratio can be set by the
following voltage:
SW1
Connect a bypass capacitor to this pin to reduce the high-
frequency impedance with the ground.
- 1.0-4.7 Division signal output pin. Emitter follower output. 0.1 Vpf or
more can be output under 200-ohmload. Connect a coupling
capacitor to this pin for DC cutting with an external circuit
(for example,1000 pF).
2.2-5.5 - Power supply voltage pin for the output buffer circuit. Connect
a bypass capacitor to this pin to reduce the high-frequency
impedance with the ground (for example, 1000 pF).
Function
Pin No. Pin Name
1 V
CC1
2 IN
3 IN
4 GND
5 SW1
6 SW2
7 OUT
8 V
CC2
D Q
CLK OUT
Q
SW2
SW2
H L
H 1/2 1/4
L 1/4 1/2
21