PCF8579T/1,112

Overview

The PCF8579T/1,112 is a low-power CMOS LCD column driver designed for driving multiplexed dot-matrix displays with rates of 1:8, 1:16, 1:24, or 1:32. It provides 40 outputs to drive 32 rows in a 32 x 40 point matrix and supports cascading up to 16 units on a single I²C bus using two slave addresses. The device includes 1280 bits of display RAM with automatic incrementing addressing and memory bank switching to minimize communication overhead. It operates with a logic supply voltage range of 2.5 V to 6 V and a maximum LCD supply voltage of 9 V.

Feature Summary

• Functions as a dedicated column driver within an LCD dot-matrix driver chipset, typically paired with row drivers like the PCF8578.
• Features 1280-bit display RAM with automatic incrementing addressing and display library switching to reduce system communication load.
• Supports flexible multiplexing configurations including 1:8, 1:16, 1:24, and 1:32 rates with external bias options.
• Enables large-scale display expansion by allowing up to 16 devices to be cascaded on one I²C bus.

Applications

• Automotive information systems
• Telecommunication equipment
• Point-of-sale (POS) terminals
• Industrial computer terminals
• Instrumentation and metering

Procurement Notes

Verify the specific suffix '1,112' against official NXP documentation to confirm package type and reel specifications, as ordering codes determine physical attributes. Confirm current availability status, as this component may be discontinued or in limited supply. Ensure compatibility with existing I²C bus architectures and microcontroller interfaces before procurement.

Selection Notes

Select this component when designing systems requiring high-density dot-matrix LCD control via I²C. It is suitable for applications needing scalable display sizes through cascading. Consider pairing with the PCF8578 row driver for complete matrix control. Evaluate power consumption requirements against the 2.5 V to 6 V logic supply range and ensure the display multiplex rate matches the design constraints.

Part Context

The PCF8579 series belongs to NXP's family of low-power CMOS LCD drivers. It is specifically engineered to work in conjunction with the PCF8578 row driver to form a comprehensive chipset capable of driving large dot-matrix displays up to 40,960 points. This integration allows for efficient pin usage and simplified PCB layout in complex display applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify if the PCF8579HT or other variants within the PCF8579 family offer equivalent functionality and packaging for direct replacement.