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40 Dot Matrix LCD Segment Driver
Features
•
Operating voltage: 2.7V ~5.5V
•
LCD driving voltage: 3.0V~5.2V
•
Applicable LCD duty from 1/8 to 1/16
Applic ations
•
Interface with HT163A
•
Electronic dictionaries
•
Portable computers
General Description
The HT1602L is a dot matrix LCD segment
driver LSI implemented in CMOS technology.
The chip contain s 40-bit shift regi ster (two 20 bit shift registers), 40-bit latch (two 20-bit
latches), 40-bit level shifter, 40-bit 4-level
driver and control circuits.
The HT1602 L can conve rt serial d ata received
from an LCD control ler parall el data and the n
HT1602L
•
Suitable for various types of LCD panel
•
Bias voltage adjustable from an external
source
•
Remote controllers
•
Calculators
send them out as LCD driving waveforms to the
LCD panel. The chip is applicable up to 1/16
duty. Furthermore, the bias voltage which de termines the LCD driving voltage can be optionally supplied from an external s ource, thu s th e
chip is suitable for drivi ng various LCD p anel.
These specia l features increase the versa tility
of the chip.
Block Diagram
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Pad Assignment
HT1602L
Chip size: 87 × 74 (mil)
* The IC substrate should be connected to VSS in the PCB layout artwork.
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Pad Coordinates Unit: µm
Pad No. X Y Pad No. X Y
1 –975.00 780.00 28 975.00 –713.00
2 –975.00 650.00 29 975.00 –583.00
3 –975.00 520.00 30 942.50 –435.50
4 –975.00 390.00 31 942.50 –305.50
5 –975.00 260.00 32 942.50 –175.50
6 –975.00 130.00 33 975.00 –45.50
7 –975.00 0.00 34 923.50 84.50
8 –975.00 –130.00 35 975.00 239.00
9 –975.00 –260.00 36 975.00 369.00
10 –975.00 –390.00 37 975.00 499.00
11 –975.00 –520.00 38 975.00 629.00
12 –975.00 –650.00 39 975.00 780.00
13 –975.00 –780.00 40 845.00 780.00
14 –845.00 –780.00 41 715.00 780.00
15 –715.00 –780.00 42 585.00 780.00
16 –585.00 –780.00 43 455.00 780.00
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HT1602L
Pad No. X Y Pad No. X Y
17 –455.00 –780.00 44 325.00 780.00
18 –325.00 –780.00 45 195.00 780.00
19 –195.00 –780.00 46 65.00 780.00
20 –65.00 –780.00 47 –65.00 780.00
21 65.00 –780.00 48 –195.00 780.00
22 195.00 –780.00 49 –325.00 780.00
23 325.00 –780.00 50 –455.00 780.00
24 455.00 –780.00 51 –585.00 780.00
25 585.00 –780.00 52 –715.00 780.00
26 715.00 –780.00 53 –845.00 780.00
27 845.00 –780.00
Pad Description
Pad No. Pad Name I/O Description
1~5 Y15~Y19 O LCD driver output for segment*
6 VDD — Power supply (postive)
7~26 Y20~Y39 O LCD driver output for segment
27 DO39 O Shift register output pad for the 40th bit data
28 DI20 I Data input pad of shift register 2
29 DO19 O Shift register output pad for the 20th bit data
30, 31, 32 V5, V3, V2 I LCD bias supply voltage
33 VSS — Power supply (ground)
34 VDD — Power supply (positive)
35 CLK I Clock pulse input pad for the shift register
36 DI0 I Data input pad of shift register 1
37 LOAD I Latching signal to latch shift register data
38 ALT I Alternate signal input pad for LCD driving waveform
39~53 Y0~Y14 O LCD driver output for segment*
*: For Y0~Y39, one of VDD, V2, V3 or V5 is selected as a display driving source according to the
combination of latched data level and ALT signal. Refer to the following table:
Latched Data A LT Display data output level
H
L
HV5
LV
HV3
LV2
DD
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HT1602L
Absolu te Maxim um Ratings *
Supply Voltage..............................–0.3V to 6.0V Storage Temperature.................–50°C to 125°C
Input Voltage................. V
*Note: These are stress ra tings on ly. Stresses exceeding the range specified under “Abso lute Maxi -
mum Ratings” ma y 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 condition s may affect device reliability.
D.C. Characteristics Ta=25°C
–0.3V to VDD+0.3V Operating Temperature...............–20°C to 70°C
SS
Symbol Parameter
V
I
OP
I
DD
f
LCD
tw
V
V
V
DD
CLK
IL
IH
LCD
Operating Voltage — — 2.7 — 5.5 V
Operating Current 5V No load — 100 300 µA
Standby Current 5V — — 1 5 µA
Clock Freque nc y 5V — 3.3 — — MHz
Clock Pulse Width 5V — 125 — — ns
“L” Input Voltage 5V — — — 0.3VDD V
“H” Input Voltage 5V — 0.7VDD — — V
LCD Driving Voltage 5V — 3 — 5.2 V
Test Conditions
V
DD
Conditions
Min. Typ. Max. Unit
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Timing Diagrams
1/16 duty and 1/5 bias
HT1602L
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Application Circuits
HT1602L
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