COP472-3

COP472-3 Liquid Crystal Display Controller July 1995 COP472-3 Liquid Crystal Display Controller General Description The COP472–3 Liquid Crystal Display (LCD) Controller is a peripheral member of the COPSTM family fabricated using CMOS technology The COP472-3 drives a multiplexed liquid crystal display directly Data is loaded serially and is held in internal latches The COP472-3 contains an on-chip oscillator and generates all the multi-level waveforms for backplanes and segment outputs on a triplex display One COP472-3 can drive 36 segments multiplexed as 3 x 12 (4 digit display) Two COP472-3 devices can be used together to drive 72 segments (3 x 24) which could be an 8 digit display Features Y Y Y Y Y Y Y Y Y Y Direct interface to TRIPLEX LCD Low power dissipation (100 mW typ ) Low cost Compatible with all COPS processors Needs no refresh from processor On-chip oscillator and latches Expandable to longer displays Operates from display voltage MICROWIRETM compatible serial I O 20-pin Dual-In-Line package and 20-pin SO Block Diagram TL DD 6932 – 1 COPSTM and MICROWIRETM are trademarks of National Semiconductor Corporation C1996 National Semiconductor Corporation TL DD 6932 RRD-B30M56 Printed in U S A http www national com Absolute Maximum Ratings Voltage at CS DI SK pins Voltage at all other Pins Operating Temperature Range b 0 3V to a 9 5V b 0 3V to VDD a 0 3V Storage Temperature Lead Temp (Soldering 10 Seconds) b 65 C to a 150 C 300 C 0 C to 70 C DC Electric...