GENERAL DESCRIPTION

The PCF8579 is a low power CMOS LCD column driver, designed to drive dot matrix graphic displays at multiplex rates of 1 : 8, 1 : 16, 1 : 24 or 1 : 32. The device has 40 outputs and can drive 32 × 40 dots in a 32 row multiplexed LCD. Up to 16 PCF8579s can be cascaded and up to 32 devices may be used on the same I2C-bus (using the two slave addresses). The device is optimized for use with the PCF8578 LCD row/column driver.

FEATURES

? LCD column driver

? Used in conjunction with the PCF8578, this device forms part of a chip set capable of driving up to 40960 dots

? 40 column outputs

? Selectable multiplex rates; 1 : 8, 1 : 16, 1 : 24 or 1 : 32

? Externally selectable bias configuration, 5 or 6 levels

? Easily cascadable for large applications (up to 32 devices)

? 1280-bit RAM for display data storage

? Display memory bank switching

? Auto-incremented data loading across hardware subaddress boundaries (with PCF8578)

? Power-on reset blanks display

? Logic voltage supply range 2.5 to 6 V

? Maximum LCD supply voltage 9 V

? Low power consumption

? I2C-bus interface

? TTL/CMOS compatible

? Compatible with most microcontrollers

? Optimized pinning for single plane wiring in multiple device applications (with PCF8578)

? Space saving 56-lead plastic mini-pack and 64-pin plastic low profile quad flat package

? Compatible with chip-on-glass technology

? I2C-bus address: 011110 SA0.

APPLICATIONS

? Automotive information systems

? Telecommunication systems

? Point-of-sale terminals

? Computer terminals

? Instrumentation.