TCA9538PWR

Overview

The TCA9538PWR is an 8-bit I/O expander from Texas Instruments designed for I2C and SMBus interfaces. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting flexible logic levels. The device features a maximum clock frequency of 400 kHz and includes an interrupt output pin for efficient event handling. It is housed in a TSSOP-16 package suitable for surface mount applications. The component provides configuration registers, a reset pin, and ESD protection rated at 2 kV. It functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Supports I2C and SMBus serial communication protocols with configurable addresses
• Includes dedicated interrupt output pin for monitoring input state changes
• Features internal configuration registers allowing individual pin direction control
• Provides hardware reset functionality via an external reset pin

Applications

• Portable consumer electronics requiring low power I/O expansion
• Industrial control systems utilizing SMBus communication
• Embedded systems needing additional general-purpose input/output lines
• Battery-operated devices operating on variable voltage supplies

Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel specifications. Ensure compatibility with system voltage levels between 1.65 V and 5.5 V. Confirm interface requirements match I2C or SMBus standards. Check environmental ratings against operational temperature needs. Validate pinout alignment with PCB layout designs before finalizing procurement decisions.

Selection Notes

Select this component when eight bidirectional I/O lines are required alongside interrupt capabilities. Consider the wide supply voltage range if interfacing with mixed-voltage logic domains. Evaluate the TSSOP-16 footprint constraints against available board space. Compare performance metrics against similar expanders if higher pin counts or different interface speeds are necessary for the specific application design.

Part Context

This part belongs to the TCA9538 family of remote 8-bit I/O expanders. It shares architectural similarities with the PCA9538 but offers extended voltage support down to 1.65 V. The PWR suffix indicates a TSSOP-16 plastic package variant. It serves as a bridge between microcontrollers and peripheral devices lacking native digital interfaces.

Replacement Considerations

The PCA9538PWR is a related variant with a minimum voltage of 2.3 V. Verify voltage compatibility before substitution. Other family members may offer different pin counts or interface options.