General description
●The PCF85176 is a peripheral device which interfaces to almost any Liquid Crystal Display (LCD)1 with low multiplex rates. It generates the drive signals for any static or multiplexed LCD containing up to four backplanes and up to 40 segments. It can be easily cascaded for larger LCD applications.
●Features and benefits
●Single chip LCD controller and driver
●Selectable backplane drive configuration: static, 2, 3, or 4 backplane multiplexing
●Selectable display bias configuration: static, 1
●⁄2, or
●1
●⁄3
●Internal LCD bias generationwith voltage-follower buffers
●40 segment drives:
● Up to twenty 7-segment alphanumeric characters
● Up to ten 14-segment alphanumeric characters
● Any graphics of up to 160 elements
●40×4-bit RAM for display data storage
●Auto-incremented display data loading across device subaddress boundaries
●Display memory bank switching instatic and duplex drive modes
●Versatile blinking modes
●Independent supplies possible for LCD and logic voltages
●Wide power supply range: from 1.8 V to 5.5 V
●Wide logic LCD supply range:
● From 2.5 V for low-threshold LCDs
● Up to 6.5 V for guest-host LCDs and high-threshold twisted nematic LCDs
●Low power consumption
●400 kHz I2C-bus interface
●May be cascaded for large LCD applications (up to 2560 elements possible)
●No external components required
●Manufactured insilicon gate CMOS process
