PCA9675PW/S911,118

I/o Expanders Overview

The PCA9675PW/S911,118 is a remote 16-bit I/O expander for Fast-mode Plus (Fm+) I2C-bus systems. It features a 1 MHz I2C interface compliant with Fast and Standard modes, supporting SDA sink capability of 30 mA for buses up to 4000 pF. The device operates on a supply voltage range of 2.3 V to 5.5 V with 5.5 V tolerant I/Os. It includes 16 quasi-bidirectional pins that default to inputs at power-up, latched outputs with 25 mA sink capability for direct LED driving, and a total package sink capacity of 400 mA. An active LOW open-drain interrupt output is provided, along with 64 programmable slave addresses via three address pins.

I/o Expanders Feature Summary

• Supports high-speed 1 MHz I2C communication for efficient data transfer and PWM dimming applications
• Provides robust current drive capabilities with individual pin and total package limits suitable for direct LED loads
• Enables flexible system integration through multiple programmable slave addresses and an interrupt output line

I/o Expanders Applications

• LED signs and displays
• Servers
• Industrial control systems
• Programmable logic controllers (PLCs)
• Cellular telephones
• Gaming machines
• Instrumentation and test measurement equipment

I/o Expanders Procurement Notes

Verify the complete part number including the ordering suffix to ensure correct packaging and reel specifications. Confirm the package type matches the design requirements, as the PCA9675 series is available in multiple form factors. Cross-reference the manufacturer's latest documentation to validate compliance standards and operational temperature ranges before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when upgrading from legacy expanders requiring higher bus speeds and greater current drive. Ensure the application utilizes the Fm+ I2C speed capabilities and benefits from the increased sink current capacity. Verify that the required number of slave addresses fits within the 64-address limit defined by the three address pins. Consider the interrupt functionality if asynchronous port status notification is necessary for the microcontroller.

I/o Expanders Part Context

This part belongs to the PCA9675 family of remote I/O expanders designed as drop-in upgrades for older devices like the PCF8575. It offers enhanced performance metrics including faster I2C speeds and higher current handling. The PW designation indicates the TSSOP24 package variant, which provides a compact solution for surface-mount assembly while maintaining the electrical characteristics of the broader series.

I/o Expanders Replacement Considerations

The PCA9675 serves as a direct upgrade replacement for the PCF8575, offering improved I2C bus speeds and drive capabilities. When substituting, verify that the existing PCB layout supports the TSSOP24 package dimensions. Ensure the system firmware can handle the specific I2C addressing and reset sequences unique to the PCA9675 architecture.