PCA8575PW,118

I/o Expanders Overview

The PCA8575PW,118 is a remote 16-bit I/O expander for the I2C-bus with interrupt functionality. It provides general-purpose remote I/O expansion for microcontroller families via a two-line bidirectional I2C interface (SCL and SDA). The device features a 16-bit quasi-bidirectional port and latched outputs with high current drive capability for directly driving LEDs. It includes an active LOW open-drain interrupt output that allows the remote I/O to inform the microcontroller of incoming data without bus communication. The part operates within a voltage range of 2.3 V to 5.5 V, supports up to 400 kHz I2C clock frequency, and offers eight programmable slave addresses using three address pins.

I/o Expanders Feature Summary

• Provides 16-bit remote I/O expansion via a standard two-line bidirectional I2C-bus interface.
• Features latched outputs with high current sink capability suitable for direct LED driving.
• Includes an active LOW open-drain interrupt line to signal port changes to the host controller.
• Supports multiple slave addresses through hardware-configurable address pins.

I/o Expanders Applications

• LED signs and displays
• Industrial control systems
• Medical equipment
• Programmable logic controllers (PLCs)
• Servers

I/o Expanders Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB footprints and thermal requirements before finalizing procurement decisions.

I/o Expanders Selection Notes

Select this component when a system requires expanding microcontroller GPIO capabilities over an I2C bus. Consider the 2.3 V to 5.5 V operating range and the need for interrupt-driven input monitoring. Verify that the TSSOP24 package fits the available board space and assembly constraints.

I/o Expanders Part Context

This component belongs to the PCA8575 family of 16-bit I/O expanders from NXP Semiconductors. It serves as a drop-in replacement for similar devices like the PCF8575, offering enhanced interrupt handling and higher current drive capabilities while maintaining software compatibility.

I/o Expanders Replacement Considerations

The PCA9673 is a documented upgrade path offering faster I2C speeds and additional addresses. Verify pinout compatibility and software register mapping differences before substituting with other 16-bit I2C expanders.