PCF8579 Datasheet, PDF(1/41 Page) NXP Semiconductors – LCD column driver for dot matrix graphic displays

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PCF8579 Datasheet, PDF (1/41 Pages) NXP Semiconductors – LCD column driver for dot matrix graphic displays

PCF8579

LCD column driver for dot matrix graphic displays

Rev. 05 â 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 Ã 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 conï¬guration, 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 (with

PCF8578)

I Power-On Reset (POR) blanks display

I Logic voltage supply range 2.5 V to 6 V

I Maximum LCD supply voltage 9 V

I Low power consumption

I I2C-bus interface

I Compatible with most microcontrollers

I Optimized pinning for single plane wiring in multiple device applications (with

PCF8578)

I Space saving 56-lead small outline package and 64-pin quad ï¬at pack

1. The deï¬nition of the abbreviations and acronyms used in this data sheet can be found in Section 15.

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