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AY0438-S Datasheet

  • AY0438-S

  • 32-Segment CMOS LCD Driver

  • 11頁

  • MICROCHIP   MICROCHIP

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AY0438
32-Segment CMOS LCD Driver
FEATURES
鈥?Drives up to 32 LCD segments of arbitrary con鏗乬-
uration
鈥?CMOS process for: wide supply voltage range,
low- power operation, high-noise immunity, wide
temperature range
鈥?CMOS and TTL-compatible inputs
鈥?Electrostatic discharge protection on all pins
鈥?Cascadable
鈥?On-chip oscillator
鈥?Requires only three control lines
PIN CONFIGURATION
40-Lead Dual In-line
V
DD
LOAD
SEG 32
SEG 31
SEG 30
SEG 29
SEG 28
SEG 27
SEG 26
SEG 25
SEG 24
SEG 23
SEG 22
SEG 21
SEG 20
SEG 19
SEG 18
SEG 17
SEG 16
SEG 15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
CLOCK
SEG 1
SEG 2
SEG 3
V
SS
DATA OUT
DATA IN
SEG 4
SEG 5
LCD桅
BP
SEG 6
SEG 7
SEG 8
SEG 9
SEG 10
SEG 11
SEG 12
SEG 13
SEG 14
APPLICATIONS
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Industrial displays
Consumer product displays
Telecom product displays
Automotive dashboard displays
DESCRIPTION
The AY0438 is a CMOS integrated device that drives a
liquid crystal display, usually under microprocessor
control. The part acts as a smart peripheral that drives
up to 32 LCD segments. It needs only three control
lines due to its serial input construction. It latches the
data to be displayed and relieves the microprocessor
from the task of generating the required waveforms.
The AY0438 can drive any standard or custom parallel
drive LCD display, whether it be 鏗乪ld effect or dynamic
scattering; 7-, 9-, 14- or 16-segment characters; deci-
mals; leading + or -; or special symbols. Several
AY0438 devices can be cascaded. The AC frequency
of the LCD waveforms can either be supplied by the
user or generated by attaching a capacitor to the LCD
input, which controls the frequency of an internal oscil-
lator.
The AY0438 is available in 40-lead dual in-line plastic
and 44-lead PLCC packages. Unpackaged dice are
also available.
44 PLCC
NC
SEG 30
SEG 31
SEG 32
LOAD
V
DD
CLOCK
SEG 1
SEG 2
SEG 3
V
SS
6
5
4
3
2
1
44
43
42
41
40
AY0438
SEG 29
SEG 28
SEG 27
SEG 26
SEG 25
SEG 24
SEG 23
SEG 22
SEG 21
SEG 20
SEG 19
7
8
9
10
11
12
13
14
15
16
17
AY0438
39
38
37
36
35
34
33
32
31
30
29
NC
DATA OUT
DATA IN
SEG 4
SEG 5
LCD桅
BP
SEG 6
SEG 7
SEG 8
NC
漏
1995 Microchip Technology Inc.
SEG 18
SEG 17
SEG 16
SEG 15
SEG 14
SEG 13
SEG 12
SEG 11
SEG 10
SEG 9
NC
18
19
20
21
22
23
24
25
26
27
28
DS70010I-page 1

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