PCA9538APWJ

I/o Expanders Overview

The PCA9538APWJ is a low-voltage 8-bit I2C-bus/SMBus GPIO expander with interrupt and reset capabilities, manufactured by NXP Semiconductors. It operates within a supply voltage range of 1.65 V to 5.5 V and supports 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 includes four 8-bit registers for configuration, input, output, and polarity inversion. The component is housed in a TSSOP16 package and functions as a pin-to-pin replacement for the standard PCA9538.

I/o Expanders Feature Summary

• Provides flexible General Purpose Input/Output expansion via I2C interface
• Includes dedicated hardware pins for address selection allowing multiple devices on one bus
• Features internal power-on reset and external active LOW reset input

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Fan control systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'J' corresponds to the reel pack SMD packaging method when sourcing components. Confirm that the TSSOP16 package variant matches the required board layout dimensions. Ensure the operating temperature range aligns with the specified -40 °C to +85 °C ambient conditions for the application environment.

I/o Expanders Selection Notes

Select this component when a wide supply voltage range from 1.65 V to 5.5 V is required for interfacing with various microcontrollers. Consider the TSSOP16 package if surface mount assembly with a body width of 4.4 mm is preferred over the HVQFN16 option. Verify that the 25 mA sink capability meets the drive requirements for connected peripherals like LEDs.

I/o Expanders Part Context

This part belongs to the PCA9538A series, which serves as a low-voltage I/O port solution. It is designed as a direct pin-to-pin replacement for the original PCA9538 and other industry-standard devices. The series focuses on minimizing interconnections while providing essential GPIO expansion through the I2C bus protocol.

I/o Expanders Replacement Considerations

The PCAL9538A is available as a more fully functional alternative featuring Agile I/O capabilities. Designers should consult the respective data sheets to evaluate if the additional features justify any potential design changes during substitution.