Filter
Top Products
TK-260G/270G
21
CIRCUIT DESCRIPTION/SEMICONDUCTOR DATA
Fig. 10 Control system
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.
SEMICONDUCTOR DATA
LCD Driver : LC75823W (Display UNIT IC501)
(TK-270G only)
■ Block diagram
LATCH & DRIVER
SHIFT REGISTER
COMMON
DRIVER
ADDRESS
DETECTOR
CLOCK
GENERATOR
V
DD
CECLDI V
SS
OSC
INH
V
DD
2
V
DD
1
COM1 COM2 COM3 S52 S51 S1
Pin No.
Name I/O
Active
Function
1-52 S1-S52 O -
Segment output for displaying data
transferred form serial data.
53-55
COM1-COM3
O-
Common drive output.
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 - from outside. If 1/2 the bias is applied,
connect to VDD2.
Apply 1/3 the LCD drive bias voltage
59 VDD2 I - from outside. If 1/2 the bias is applied,
connect to VDD1.
■ Pin function
60 VSS - -
61 OSC I/O - Oscillation terminal
62 CE I H
Chip enable. Serial data transfer terminal.
Connected to the microprocessor.
63 CL I
Synchronizing clock. Serial data transfer terminal.
Connected to the microprocessor.
64 DI I -
Trnsfer data. Serial data transfer terminal.
Connected to the microprocessor.
Pin No.
Name I/O
Active
Function
UPB1509GV (IC301)
■ Pin connection diagram
1
2
3
4
5
6
7
8
DQ
Q
CLK
DQ
Q
CLK
DQ
Q
CLK OUT
IN
IN
SW1 SW2
Pin No. Pin Name
1VCC1
2IN
3IN
4GND
5 SW1
6 SW2
7 OUT
8VCC2
■ Block diagram
Pin Pin Applied Pin
Functions and uses
No. name
voltage voltage
1VCC1 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).
2 IN - 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).
3
IN
- 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).
4 GND 0 -
Ground pin. Connect it with the ground pattern. The ground
pattern on the PC board should be wide enough to minimize
impedance.
5 SW1 H/L -
Division ratio setting pin. The division ratio can be set by the
following voltage:
6 SW2
Connect a bypass capacitor to this pin to reduce the high-
frequency impedance with the ground.
7 OUT - 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).
8VCC2 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).
SW2
HL
SW1
H 1/2 1/4
L 1/4 1/2
■ Pin Fanction
Channel selector
IC13
-COM
CN501
CN1
TK-270G
TK-260G
EN1
87
3
25
EN3
EN2
KOUT0
KOUT1
KOUT2
KOUT3
KIN0
KIN1
KIN2
KIN3
KIN4
16
27
KEYAD
PTT
MONI
SW
LAMP
SW
PTT
SW
1
2
3A
4
5
6B
7
8
9C
∗
0
#D
5M
47k
47k
100k