PCF8579H/1,157

Overview

The PCF8579H/1,157 is a low-power CMOS LCD column driver designed for dot matrix graphic displays with multiplex rates of 1:8, 1:16, 1:24, or 1:32. It features 40 outputs to drive a 32 x 40 point display and includes 1280-bit RAM for display data storage. The device communicates via an I²C bus interface compatible with most microcontrollers. It supports cascading up to 16 units on a single bus using two slave addresses. Logic power ranges from 2.5 V to 6 V, with a maximum LCD supply voltage of 9 V.

Feature Summary

• Functions as a dedicated column driver within the PCF8578/PCF8579 chipset for large dot matrix displays.
• Integrates 1280-bit display RAM with auto-incremented addressing to minimize communication overhead.
• Supports flexible multiplexing ratios and external bias configurations for varied display requirements.
• Enables efficient system wiring through optimized pin connections when used with row drivers.

Applications

• Automotive information systems
• Telecommunications equipment
• Point-of-sale (POS) terminals
• Industrial computer terminals
• Instrumentation devices

Procurement Notes

Verify component authenticity by checking the manufacturer's marking code against official documentation. Confirm the specific ordering suffix matches the required package type. Ensure compatibility with existing I²C bus protocols and voltage levels before integration. Review the latest datasheet revisions for any updates to electrical characteristics or mechanical dimensions.

Selection Notes

Select this component when designing systems requiring high-density dot matrix graphics driven by a separate row controller. It is suitable for applications needing scalable display sizes through cascading multiple units. Consider the I²C interface constraints and available address space when planning multi-device architectures. Evaluate power consumption requirements relative to the specified logic and LCD supply voltages.

Part Context

This part belongs to the NXP PCF85xx series of LCD drivers, specifically engineered for complex graphical interfaces. It complements the PCF8578 row driver to form a complete solution capable of driving displays up to 40,960 points. The series emphasizes low power consumption and flexible configuration options for various industrial and consumer electronics applications.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. As the product status indicates discontinuation, consult NXP support for current alternatives or design-in guidance for equivalent functionality.