PCA9673PW,112

I/o Expanders Overview

The PCA9673PW,112 is a remote 16-bit I/O expander for Fast-mode Plus I2C-bus systems with interrupt and reset capabilities. It operates within a voltage range of 2.3 V to 5.5 V, featuring 5.5 V tolerant I/Os. The device supports a 1 MHz I2C interface compliant with Fast and Standard modes, providing 30 mA sink capability on the SDA line for buses up to 4000 pF. Each of the 16 quasi-bidirectional ports offers latched outputs with 25 mA sink capability for direct LED driving, while the total package sink capacity reaches 400 mA. It includes an active LOW open-drain interrupt output and allows 16 programmable slave addresses via two address pins.

I/o Expanders Feature Summary

• Provides 16-bit remote I/O expansion with Fast-mode Plus I2C interface supporting up to 1 MHz speed
• Features latched outputs with high current drive capability for direct LED connection
• Includes hardware reset input and active LOW open-drain interrupt output for system control
• Supports readable device ID and software reset sequences via reserved I2C addresses

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix '112' against official NXP documentation to confirm tape and reel packaging details. Confirm that the TSSOP24 package variant matches the required board layout constraints. Ensure compatibility with existing I2C bus pull-up resistor values given the 30 mA SDA drive specification.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 designs requiring higher bus speeds and drive currents. The RESET pin replaces the A2 address pin found in legacy counterparts, necessitating schematic adjustments. Verify that the 16 available slave addresses meet system requirements without conflicts.

I/o Expanders Part Context

The PCA9673 serves as a drop-in upgrade for the PCF8575, offering enhanced performance through increased I2C bus speed and drive strength. It belongs to NXP's Fast-mode Plus family, designed to support more devices on the bus without buffers. The PW suffix indicates the TSSOP24 plastic thin shrink small outline package variant.

I/o Expanders Replacement Considerations

PCA9673D (SO24 package), PCA9673BQ (DHVQFN24 package), PCA9673BS (HVQFN24 package). These variants share identical electrical characteristics but differ in physical package dimensions and pin configurations.