NXP 公司的PCA85133是單片LCD控制器和驅除器,低復接速率的通用LCD驅動器,能產生任何靜態驅動信號,或復接多達4個背板或多達80段的LCD,并很容易級聯以適應更大LCD應用. PCA85133可選擇的幀頻率為82Hz或110Hz,工作電壓從1.8 V 到5.5 V,400 kHz I2C總線接口.本文介紹PCA85133主要特性,方框圖, 典型系統配置和級聯PCA85133配置圖.
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
圖1.PCA85133方框圖
圖2. PCA85133典型系統配置
圖3. 級聯PCA85133配置圖