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.