PCA9538PWG4

I/o Expanders Overview

The PCA9538PWG4 is an 8-bit I/O expander from Texas Instruments, packaged in a TSSOP-16 surface-mount housing. It operates on a supply voltage range of 2.3 V to 5.5 V and supports I2C and SMBus interfaces with a maximum clock frequency of 400 kHz. The device provides eight general-purpose parallel inputs or outputs, featuring an open-drain interrupt output and a dedicated reset pin. It functions within a temperature range of -40°C to +85°C and includes configuration registers for input/output selection and polarity inversion.

I/o Expanders Feature Summary

• Provides 8-bit GPIO expansion with interrupt and reset capabilities for I2C-bus/SMBus applications
• Features an open-drain interrupt output activated when input states differ from the Input Port register
• Includes hardware pins to vary the fixed I2C-bus address, allowing up to four devices on the same bus

I/o Expanders Applications

• ACPI power switch control
• Sensor interface expansion
• Push-button and LED monitoring systems

I/o Expanders Procurement Notes

Verify the specific suffix 'G4' indicates lead-free compliance and RoHS adherence as per manufacturer documentation. Confirm the package type matches the required TSSOP-16 footprint for PCB layout compatibility. Ensure the operating voltage requirements align with the system's 2.3 V to 5.5 V range before integration.

I/o Expanders Selection Notes

Select this component when 8-bit I/O expansion is required with low power consumption. It serves as a direct alternative to the PCA9554 but lacks internal I/O pull-up resistors. Consider the availability of the TSSOP-16 package and the necessity for a hardware reset pin in the design constraints.

I/o Expanders Part Context

This part belongs to the PCA9538 series of CMOS I/O expanders developed by Texas Instruments. It enhances the family of I2C-bus I/O expanders by offering a simple solution for adding GPIOs without complex protocol handling. The device is designed to integrate seamlessly into existing I2C or SMBus architectures.

I/o Expanders Replacement Considerations

The PCA9554 is functionally similar but includes internal I/O pull-up resistors. Verify if the absence of pull-ups in the PCA9538 affects the specific application circuitry. Other variants like PCA9538DB or PCA9538DGVR offer different packaging options.