austria
micro
systems
A S 11 2 0
46-Segment LCD Driver
D a ta S he e t
1 General Description
The AS1120 is an LCD direct-driver capable of driving
up to 46 LCD segments with one non-multiplexed back-
plane.
The device contains an integrated serial-to-parallel inter-
face and generates the necessary signals to drive LCD
panels.
Internal synchronous backplane signal regeneration
allows the device to mix different drivers with different
LCDs for superior brightness stability over a wide tem-
perature range. The device also supports external back-
plane signals.
The AS1120 was specifically designed to easily inter-
face with a variety of microprocessors and a wide range
of LCD panel types.
The AS1120 is available in a 64-pin PQFP package.
2 Key Features
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46-Segment LCD Driver
Serial-to-Parallel Interface
Integrated Oscillator w/ External R/C and Backplane
Input
Supports Alphanumeric and Bar-Graph Devices
Two Data Transfer Configurations:
- Cascade
- Parallel
Non-Multiplexed Backplane
Very-Low Current Consumption
Power Supply Range: 3.0 to +5.5V
Operating Temperature Range: -40 to +85ºC
64-pin PQFP Package
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3 Applications
The device is ideal for industrial LCD systems, portable-
system displays, panel meters with wide temperature
ranges, high-performance optical displays, or for any
other space-limited A/D application with low power-con-
sumption and single-supply requirements.
Figure 1. Application Diagram
+V
DD
43
V
DD
AS1120
XOR
46-bit
LCD[0:45]
6
TEST
9
LOAD
13
RESETN
10
DATAIN
8
CLKIN
11
BPLIN
15
OSC
OSC
Shift Register
46-bit
7
DATAOUT
12
BPLOUT
42
V
SS
14
V
SSOSC
Register
46-bit
R
EXT
Divide by
16
C
EXT
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