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.