NXP 公司的PCF8566是单片LCD控制器/驱动器，能驱动多达12个7段数字字符，多达6个14段字符，或多达96元素的任何图形，I2C总线接口，电源电压2.5V到6V,TTL和CMOS电平兼容。本文介绍了PCF8566主要特性，方框图和系统配置框图以及级联PCF8566配置框图与单平面PCF8566连接框图。

The PCF8566 is a peripheral device which interfaces to almost any Liquid Crystal Display (LCD) with low multiplex rates. It generates the drive signals for any static or multiplexed LCD containing up to four backplanes and up to 24 segments and can easily be cascaded for larger LCD applications. The PCF8566 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).

PCF8566主要特性:

Single-chip LCD controller/driver

24 segment drives:

Up to twelve 7-segment numeric characters including decimal pointer

Up to six 14-segment alphanumeric characters

Any graphics of up to 96 elements

Versatile blinking modes

No external components required (even in multiple device applications)

Selectable backplane drive configuration: static or 2, 3, 4 backplane multiplexing

Selectable display bias configuration: static, 1 2 or 1 3

Internal LCD bias generation with voltage-follower buffers

24.4-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

LCD and logic supplies may be separated

2.5 V to 6 V power supply range

Low power consumption

Power-saving mode for extremely low power consumption in battery-operated and telephone applications

I2C-bus interface

TTL and CMOS compatible

Compatible with any 4, 8 or 16-bit microprocessor or microcontroller

May be cascaded for large LCD applications (up to 1536 segments possible)

Cascadable with 40-segment LCD driver PCF8576C

Optimized pinning for plane wiring in both and multiple PCF8566 applications

Space-saving 40-lead plastic very small outline package (VSO40; SOT158-1)

Manufactured in silicon gate CMOS process



图1. PCF8566方框图



图2.典型的PCF8566系统配置框图



图3.级联PCF8566配置框图



图4.单平面PCF8566连接框图