PCA9675DK,118

I/o Expanders Overview

The PCA9675DK,118 is a remote 16-bit I/O expander for the Fast-mode Plus (Fm+) I2C-bus with an interrupt output. It operates within a supply voltage range of 2.3 V to 5.5 V and features 5.5 V tolerant I/Os. The device provides 16 quasi-bidirectional I/O pins that default to inputs at power-up, supporting latched outputs with a sink capability of 25 mA per pin and a total package sink capacity of 400 mA. It supports I2C bus speeds up to 1 MHz and offers 64 programmable slave addresses via three address pins. Operating temperatures range from -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 16-bit remote I/O expansion compatible with I2C-bus Fast-mode Plus speeds up to 1 MHz
• Features latched outputs capable of directly driving LEDs with high current drive capability
• Includes an active LOW open-drain interrupt output to notify microcontrollers of port data changes
• Supports 64 programmable slave addresses using three address pins to prevent conflicts

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control systems
• Programmable logic controllers (PLCs)
• Cellular telephones

I/o Expanders Procurement Notes

Verify the specific SSOP24 package variant (SOT556-1) matches the design footprint requirements. Confirm the ordering suffix indicates standard product orientation. Ensure the manufacturer documentation aligns with the requested revision level before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when upgrading from PCF8575 devices to gain higher I2C bus speeds and increased drive capabilities. Consider the 64 available addresses if multiple expanders are required on a single bus. Verify that the 2.3 V minimum supply voltage meets the system's low-power operational requirements.

I/o Expanders Part Context

The PCA9675DK,118 belongs to the PCA9675 family of remote I/O expanders manufactured by NXP Semiconductors. This series is designed as a drop-in replacement for older PCF8575 devices, offering enhanced performance through faster bus speeds and higher current drive capabilities while maintaining software compatibility.

I/o Expanders Replacement Considerations

The PCA9675DK serves as a direct drop-in replacement for the PCF8575TS, sharing the same package, footprint, pinout, and software interface. Designers migrating from PCF8575 can utilize this part without modifying the PCB layout or firmware logic.