PCA9538PWR

I/o Expanders Overview

The PCA9538PWR is an 8-bit I/O expander designed for I2C and SMBus interfaces, manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features eight general-purpose digital input/output pins with configurable polarity inversion registers. It includes dedicated interrupt output, reset pin, and configuration registers for flexible system integration. Packaged in a TSSOP-16 surface-mount format, it functions reliably across temperatures from -40°C to +85°C and provides 2 kV ESD protection.

I/o Expanders Feature Summary

• Supports standard I2C and SMBus communication protocols for efficient serial data transfer
• Includes dedicated interrupt output pin to signal state changes on input ports
• Features configuration registers allowing individual pin direction setting
• Provides hardware reset functionality via dedicated reset pin

I/o Expanders Applications

• Portable battery-powered devices requiring low power consumption
• Embedded systems needing additional GPIO expansion via serial buses
• Industrial control panels utilizing SMBus communication standards
• Consumer electronics with limited microcontroller pin availability

I/o Expanders Procurement Notes

Verify the specific package type matches the design requirements, as the PCA9538 series offers multiple housing options including SOIC and SSOP variants. Confirm that the operating voltage range aligns with the target system's power supply rails. Ensure compatibility with the host controller's I2C/SMBus interface specifications before finalizing procurement decisions.

I/o Expanders Selection Notes

Select this component when an 8-bit expansion is sufficient for the application architecture. Consider alternative packages like PCA9538DW or PCA9538DB if board space constraints differ from the TSSOP-16 footprint. Evaluate whether the 400 kHz speed limit meets the system's real-time response requirements compared to faster bus interfaces.

I/o Expanders Part Context

This part belongs to the PCA9538 family of low-power I/O expanders. It shares core electrical characteristics with other suffixes such as PCA9538DWR and PCA9538DB, differing primarily in physical packaging dimensions. The PWR suffix specifically denotes the Thin-Shrink Small-Outline Package (TSSOP) variant optimized for high-density PCB layouts.

I/o Expanders Replacement Considerations

Direct functional substitutes include PCA9538DWR and PCA9538DBR, which share identical electrical specifications but utilize different package styles. Verify pin-to-pin compatibility and thermal performance differences between TSSOP and SOIC/SSOP housings during replacement planning.