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PCF8579
Information as of 2000-08-25
PCF8579; LCD column driver for dot matrix graphic displays
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 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 two 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 V
DD shutdown the ESD protection system of the SCL and SDA pins does not use a diode connected to VDD . Communication
overheads are minimized by a display RAM with auto-incremented addressing and display bank switching.
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LCD column driver
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Used in conjunction with the PCF8578, this device forms part of a chip set capable of driving up to 40960 dots
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40 column outputs
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Selectable multiplex rates; 1 : 8, 1 : 16, 1 : 24 or 1 : 32
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Externally selectable bias configuration, 5 or 6 levels
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Easily cascadable for large applications (up to 32 devices)
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1280-bit RAM for display data storage
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Display memory bank switching
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Auto-incremented data loading across hardware subaddress boundaries (with PCF8578)
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Power-on reset blanks display
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Logic voltage supply range 2.5 to 6 V
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Maximum LCD supply voltage 9 V
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Low power consumption
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