PCF85176 Datasheet, PDF (1/43 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates

PCF85176
Universal LCD driver for low multiplex rates
Rev. 01 — 14 April 2010
Product data sheet
1. 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. The PCF85176 is compatible with most
microprocessors or microcontrollers and communicates via a two-line bidirectional
I²C-bus. Communication overheads are minimized by a display RAM with
auto-incremented addressing, by hardware subaddressing, and by display memory
switching (static and duplex drive modes).
2. 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, ¹â„₂, or ¹â„₃
„ Internal LCD bias generation with 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 in static 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 in silicon gate CMOS process
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 16.