PCA9671DB,118

I/o Expanders Overview

The PCA9671DB,118 is a remote 16-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus, manufactured by NXP Semiconductors. It provides general-purpose I/O expansion via a two-line bidirectional bus and operates within a supply voltage range of 2.3 V to 5.5 V. The device features a 1 MHz maximum clock frequency and supports Standard-mode and Fast-mode I2C protocols. It includes latched outputs with 25 mA sink capability per pin and a total package sink capacity of 400 mA. The component utilizes an active LOW reset input instead of an interrupt output and offers 64 programmable slave addresses using three address pins.

I/o Expanders Feature Summary

• Supports high-speed I2C communication up to 1 MHz for efficient data transfer
• Provides direct LED driving capability through latched outputs with 25 mA sink current
• Includes hardware reset functionality for reliable system initialization
• Offers extensive address flexibility with 64 programmable slave addresses

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific package type associated with the DB suffix against official documentation before procurement. Confirm that the ordering suffix does not alter the electrical characteristics or pinout configuration. Ensure compatibility with existing PCB footprints and thermal requirements for the selected package variant.

I/o Expanders Selection Notes

Select this component when high-speed I2C communication at 1 MHz is required alongside significant output drive capabilities. It serves as a drop-in upgrade for legacy devices like the PCF8575, offering improved bus drive strength and higher total package sink capacity. Consider the availability of multiple package options including SO24, TSSOP24, HVQFN24, and DHVQFN24 for design integration.

I/o Expanders Part Context

The PCA9671 belongs to the PCA9671 series of remote I/O expanders designed for Fm+ I2C-bus applications. It is part of NXP's portfolio of interface ICs aimed at expanding microcontroller I/O capabilities. The device replaces the interrupt output found in similar legacy parts with a dedicated reset input, enhancing system reliability and control.

I/o Expanders Replacement Considerations

The PCA9671 is documented as a drop-in upgrade for the PCF8575. Designers replacing the PCF8575 should note the change from an interrupt output to a hardware reset input and verify that the increased drive capabilities are utilized correctly.