PCA9671PW,112

I/o Expanders Overview

The PCA9671PW,112 is a remote 16-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus with reset functionality. It provides general-purpose remote I/O expansion via a two-line bidirectional bus and serves as a drop-in upgrade for the PCF8575. Key electrical parameters include an operating voltage range of 2.3 V to 5.5 V with 5.5 V tolerant I/Os. The device supports a maximum clock frequency of 1 MHz and features latched outputs with 25 mA sink capability per pin, totaling 400 mA package sink capacity. It offers 64 programmable slave addresses using three address pins and includes active LOW reset input.

I/o Expanders Feature Summary

• Supports high-speed I2C communication up to 1 MHz for LED PWM dimming applications
• Provides enhanced bus drive capability with 30 mA SDA sink current
• Features hardware reset input replacing interrupt output found in predecessor devices
• Includes readable device ID for manufacturer and revision identification

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control systems
• Medical equipment
• Programmable Logic Controllers (PLCs)

I/o Expanders Procurement Notes

Verify component authenticity through authorized NXP distributors or certified suppliers. Confirm the specific ordering suffix matches project requirements. Check datasheet revisions for any updates to electrical characteristics or packaging details before finalizing procurement specifications.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 designs requiring higher bus speeds and drive strength. Ensure the application utilizes the active LOW reset feature instead of interrupt logic. Verify that the TSSOP24 package fits the PCB layout constraints and thermal requirements for the target environment.

I/o Expanders Part Context

The PCA9671 belongs to NXP's Fm+ I2C-bus family, designed to overcome limitations of standard I2C expanders. It replaces the interrupt pin with a reset input, simplifying system design for applications needing deterministic initialization. This series targets high-density I/O expansion in embedded systems requiring robust signal integrity.

I/o Expanders Replacement Considerations

PCA9673PW: Includes interrupt output alongside reset functionality.