COP472-3 Datasheet | National Semiconductor

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 m W typ ) Low cost patible with all COPS processors Needs no refresh from processor On-chip oscillator and latches Expandable to longer displays Operates from display voltage MICROWIRETM patible 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 national 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 Electrical Characteristics GND e 0V VDD e 3 0V to 5 5V TA e 0 C to 70 C (depends on display characteristics) Parameter Power Supply Voltage VDD Power Supply Current IDD (Note 1) VDD e 5 5V VDD e 3V Input Levels DI SK CS VIL VIH BPA (as Osc in) VIL VIH Output Levels BPC (as Osc Out) VOL VOH Backplane Outputs (BPA BPB BPC) VBPA BPB BPC ON VBPA BPB BPC OFF VBPA BPB BPC ON VBPA BPB BPC OFF Segment Outputs (SA1 E SA4) VSEG ON VSEG OFF VSEG ON VSEG OFF Internal Oscillator Frequency Frame Time (Int Osc d 192) Scan Frequency (1 TSCAN) SK Clock Frequency SK Width DI Data Setup t SETUP Data Hold t HOLD CS t SETUP t HOLD Output...