The PCF8579HT/1 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 PCF8579HT/1 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 PCF8579HT/1 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.
Feature
- 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
- Automotive information systems
- Telecommunication systems
- Point-of-sale terminals
- Industrial computer terminals
- Instrumentation
