NXP PCA85133通用LCD驱动方案

NXP 公司的PCA85133是单片LCD控制器和驱除器,低复接速率的通用LCD驱动器,能产生任何静态驱动信号,或复接多达4个背板或多达80段的LCD,并很容易级联以适应更大LCD应用. PCA85133可选择的帧频率为82Hz或110Hz,工作电压从1.8 V 到5.5 V,400 kHz I2C总线接口.本文介绍PCA85133主要特性,方框图, 典型系统配置和级联PCA85133配置图.

PCA85133: Universal LCD driver for low multiplex rates

The PCA85133 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 80 segments and can easily be cascaded for larger LCD applications. The PCA85133 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-incremental addressing, by hardware subaddressing, and by display memory switching (static and duplex drive modes).

AEC-Q100 compliant for automotive applications.

PCA85133主要特性:

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

Selectable frame frequency: 82 Hz or 110 Hz

Internal LCD bias generation with voltage-follower buffers

80 segment drives:

Up to 40 7-segment alphanumeric characters

Up to 21 14-segment alphanumeric characters

Any graphics of up to 320 elements

80´4 bit RAM for display data storage

Auto-incremental 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 LCD supply range for low-threshold LCDs, for guest-host LCDs, and high-threshold (automobile) twisted nematic LCDs: from 2.5 V to 8.0 V

Low power consumption

400 kHz I2C-bus interface

Compatible with 4-bit, 8-bit, or 16-bit microprocessors or microcontrollers

May be cascaded for large LCD applications (up to 5120 segments possible)

No external components needed

Compatible with Chip-On-Glass (COG) technology

Manufactured using silicon gate CMOS process

图1.PCA85133方框图

图2. PCA85133典型系统配置

图3. 级联PCA85133配置图