LCD-column driver
PCF8579
LCD column driver for dot matrix graphic displays
Rev. 05 — 11 May 2009
Product data sheet
1. General descri...
Description
PCF8579
LCD column driver for dot matrix graphic displays
Rev. 05 — 11 May 2009
Product data sheet
1. General description
The PCF8579 is a low power CMOS1 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. 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.
2. Features
I LCD column driver I Used in conjunction with the PCF8578, this device forms part of a chip set capable of
driving up to 40960 dots I 40 column outputs I Selectable multiplex rates; 1:8, 1:16, 1:24 or 1:32 I Externally selectable bias configuration, 5 or 6 levels I Easily cascadable for large applications (up to 32 devices) I 1280-bit RAM for display data storage I Display memory bank switching I Auto-incremented data loading across hardware subaddress boundaries (...
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