PCA9671PW,118

I/o Expanders Overview

The PCA9671PW,118 is a 16-bit I2C-bus I/O expander from NXP Semiconductors, packaged in TSSOP24. It operates within a supply voltage range of 2.3 V to 5.5 V and supports a maximum clock frequency of 1 MHz. The device features quasi-bidirectional I/O pins with an open-drain output type capable of sourcing up to 50 mA per pin. It includes an active LOW reset input and lacks interrupt outputs. Operating temperatures range from -40 °C to +85 °C, with ESD protection rated at 2 kV HBM.

I/o Expanders Feature Summary

• Provides 16 remote I/O expansion via the I2C bus interface
• Features latched outputs with high current drive capability for direct LED driving
• Includes hardware reset functionality replacing traditional interrupt outputs
• Supports 64 programmable slave addresses using three address pins

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control systems
• Medical equipment
• PLCs

I/o Expanders Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm package integrity and pin alignment against TSSOP-24 specifications. Review datasheet revision history for any functional updates. Ensure environmental compliance documentation matches project requirements. Validate ordering suffixes for specific packaging configurations.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 devices requiring higher bus speeds and drive capabilities. Consider the 1 MHz Fast-mode Plus interface for applications needing faster data transfer rates. Evaluate the 400 mA total package sink capacity for high-density LED arrays. Verify that the absence of an interrupt output aligns with system polling requirements.

I/o Expanders Part Context

The PCA9671 belongs to the PCA9671 series of remote I/O expanders designed for Fm+ I2C-bus applications. It serves as a drop-in upgrade for legacy components like the PCF8575, offering enhanced performance metrics including increased bus speed and drive strength while maintaining compatibility with standard microcontroller families.

I/o Expanders Replacement Considerations

PCA9675PW is a compatible alternative within the same family offering similar functionality.