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.
PCF8579主要特性:
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
