The IN472-3-3 Liquid Crystal Display (LDC) Controller is a perpheral member of the COPSTM family, fabricated using CMOS technology. The IN472-3 drives a multiplexed liquid crystal directly. Data is loaded serially and is held in internal latches. The In472-3 contains an on-chip oscillator and generates all the multi-level waveforms for back-planes and segment outputs on a triplex display. One IN472-3 can drive 36 segments multiplexed as 3 x 12 (41/2 digit display). Two IN472-3 devices can be used together to drive 72 segments (3 x 24) which could be an 81/2 digit display.

• Direct interface to TRIPLEX LCD
• Low power dissipation (100 µW typ.)
• Low cost
• Compatible with all COP400 processors
• Needs no refresh from processor
• On-chip oscillator and latches
• Expandable to longer displays
• Software compatible with COP470 V.F.Display Driver Chip
• Operates from display voltage
• MICROWIRETM compatible serial I/O
• 20-pin Dual-In-Line package