LCD Column Driver for Dot Matrix Graphic Displays

PCF8579

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 x 40 dots in a 32 row multiplexed LCD. Up to 16 PCF8579 can be cascaded and up to 32 devices may be used on the same I²C-bus (using the two target addresses). The device is optimized for use with the PCF8578 LCD row/column driver. Together these devices form a general purpose LCD dot matrix driver chip set, capable of driving displays of up to 40960 dots. The PCF8579 is compatible with most microcontrollers and communicates via a two-line bidirectional bus (I²C-bus). To allow partial VDD shutdown the ESD protection system of the SCL and SDA pins does not use a diode connected to VDD. Communication overhead is minimized by a display RAM with auto-incremented addressing and display bank switching.

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Block Diagram

Block diagram: PCF8579HT, PCF8579T

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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 (POR) blanks display
  • Logic voltage supply range 2.5 V to 6 V
  • Maximum LCD supply voltage 9 V
  • Low power consumption
  • I²C-bus interface
  • Compatible with most microcontrollers
  • Optimized pinning for single plane wiring in multiple device applications (with PCF8578)
  • Space saving 56-lead small outline package and 64-pin quad flat pack

Target Applications

  • Automotive information systems
  • Telecommunication systems
  • Point-of-sale terminals
  • Industrial computer terminals
  • Instrumentation

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