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