TLDD6932

July 1995

COP472-3 Liquid Crystal Display Controller

General Description

The COP472 – 3 Liquid Crystal Display (LCD) Controller is a

CMOS technology The COP472-3 drives a multiplexed liq-

uid crystal display directly Data is loaded serially and is held

in internal latches The COP472-3 contains an on-chip oscil-

lator and generates all the multi-level waveforms for back-

planes and segment outputs on a triplex display One

COP472-3 can drive 36 segments multiplexed as3x12

(4

digit display) Two COP472-3 devices can be used to-

gether to drive 72 segments (3 x 24) which could be an 8

digit display

Features

Y

Direct interface to TRIPLEX LCD

Y

Low power dissipation (100 mW typ)

Y

Low cost

Y

Compatible with all COPS processors

Y

Needs no refresh from processor

Y

On-chip oscillator and latches

Y

Expandable to longer displays

Y

Operates from display voltage

Y

Y

20-pin Dual-In-Line package and 20-pin SO

Block Diagram

TLDD6932 – 1

C1996 National Semiconductor Corporation

RRD-B30M56Printed in U S A

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