HT1602
40 Dot Matrix LCD Segment Driver
Block Diagram
Features
Operating voltage: 4.5V~5.5V
LCD driving voltage: 8V~16V
Applicable LCD duty cycle from 1/8 to 1/64
Suitable for various types of LCD panel
Bias voltage adjustable from an external
source
General Description
The HT1602 is a dot matrix LCD segment
driver LSI implemented in CMOS technology. It
is equipped with a 40-bit shift register (two
20-bit shift registers), a 40-bit latch (two 20-bit
latches), a 40-bit level shifter, a 40-bit 4-level
driver, and control circuits.
The HT1602 can convert serial data received
from an LCD controller to parallel data and
then send them out as LCD driving waveforms
to the LCD panel. The HT1602 can be applied
up to 1/64 duty. Furthermore, the bias voltage
which determines the LCD driving voltage can
be optionally supplied from an external source,
thus the chip is suitable for driving various
types of LCD panel. These special features in-
crease the versatility of the chip.
Applications
Electronic dictionaries
Portable computers
Remote controllers
Calculators
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28th Aug '98
Pad Description
Pad No.
Pad Name
I/O
Description
1~26
Y14~Y39
O
LCD driver outputs for segments*
27
DO39
O
Shift register output for the 40th bit data
28
DI20
I
Input data of shift register 2
29
DO19
O
Shift register output for the 20th bit data
30
VEE
I
LCD power supply
31, 32
V3, V2
I
LCD bias supply voltage
33
VSS
--
Negative power supply
34
VDD
--
Positive power supply
35
CLK
I
Clock pulse input for the shift register
36
DI0
I
Input data of shift register 1
37
LOAD
I
Latching signal to latch shift register data
38
ALT
I
Alternate input signal for LCD driving waveforms
39~52
Y0~Y13
O
LCD driver outputs for segments*
*: For Y0~Y39, any of VDD, V2, V3 or VEE can be selected as a display driving source according
to the combination of latched data level and ALT signal. Refer to the following table:
Latched Data
ALT
Display Data Output Level
H
H
V
EE
L
V
DD
L
H
V3
L
V2
Absolute Maximum Ratings*
Supply Voltage ................................. 0.3V to 6V
Storage Temperature................. 50
C to 125
C
Input Voltage................. V
SS
0.3V to V
DD
+0.3V
Operating Temperature............... 20
C to 70
C
*Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maxi-
mum Ratings" may cause substantial damage to the device. Functional operation of this
device at other conditions beyond those listed in the specification is not implied and prolonged
exposure to extreme conditions may affect device reliability.
HT1602
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28th Aug '98
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