PCA9538ABSHP

I/o Expanders Overview

The PCA9538ABSHP is a low-voltage 8-bit General Purpose Input/Output (GPIO) expander with interrupt and reset capabilities for I2C-bus/SMBus applications. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting Fast-mode I2C communication up to 400 kHz. The device features an active LOW reset input and an open-drain active LOW interrupt output. It provides 25 mA sink current capability on its outputs and includes Schmitt-trigger action for improved noise immunity. The component is housed in an HVQFN16 package and functions as a pin-to-pin replacement for the standard PCA9538.

I/o Expanders Feature Summary

• Provides flexible GPIO expansion via I2C interface
• Includes hardware interrupt and reset functionality
• Supports wide operating voltage range from 1.65 V to 5.5 V
• Features latched outputs with high drive capability

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push-button scanning
• LED control circuits
• Fan control systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix HP indicates reel packaging when sourcing this component. Confirm that the HVQFN16 package dimensions align with your PCB footprint requirements. Ensure the selected variant matches the required temperature range of -40°C to +85°C for your application environment.

I/o Expanders Selection Notes

Select this device when additional digital I/O lines are needed without increasing microcontroller pin count. It is suitable for designs requiring low standby current consumption and compatibility with both 3.3 V and 5 V logic levels. Consider the interrupt feature if real-time input state monitoring is necessary without continuous polling.

I/o Expanders Part Context

This component belongs to the PCA9538A family of I2C bus I/O expanders developed by NXP Semiconductors. It serves as a direct pin-to-pin replacement for the original PCA9538 device while offering optimized low-power characteristics. The series is designed to simplify system interconnections by providing parallel port expansion over serial buses.

I/o Expanders Replacement Considerations

The PCAL9538A is available as a more fully functional alternative with Agile I/O features. Designers should consult the respective data sheets to evaluate functional differences before substituting components.