AS1120
46-Segment LCD Driver
austriamicrosystems
Data Sheet
www.austriamicrosystems.com Revision 1.01 1 - 12
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.
Figure 1. Application Diagram
2 Key Features
! 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
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.
AS1120
9
LOAD
13
RESETN
15
OSC
+VDD
XOR
46-bit
OSC
Divide by
16
Register
46-bit
Shift Register
46-bit
LCD[0:45]
43
VDD
6
TEST
7
DATAOUT
12
BPLOUT
14
VSSOSC
42
VSS
11
BPLIN
8
CLKIN
10
DATAIN
REXT
CEXT