AS1120

46-Segment LCD Driver

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Revision 1.05

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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 LQFP 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: -0.3 to +7.0V

!

Operating Temperature Range: -40 to +85ºC

!

64-pin LQFP 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

XOR

46-bit

OSC

Divide by

16

Register

46-bit

Shift Register

46-bit

LCD[0:45]

43

6

TEST

7

DATAOUT

12

BPLOUT

14

42

11

BPLIN

8

CLKIN

10

DATAIN