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
