PCA9538PW/Q900,118

I/o Expanders Overview

The PCA9538PW/Q900,118 is an automotive-grade 8-bit I/O expander compliant with AEC-Q100 standards. It provides General-Purpose parallel Input/Output expansion for I2C-bus and SMBus applications via a TSSOP16 package. The device operates within a supply voltage range of 3.0 V to 5.5 V and supports clock frequencies up to 400 kHz. It features an active LOW interrupt output and an active LOW reset input. All eight I/O pins default to inputs upon power-on reset. The component includes registers for configuration, input port data, output port data, and polarity inversion.

I/o Expanders Feature Summary

• AEC-Q100 qualified for automotive environments
• Active LOW hardware interrupt and reset capabilities
• Configurable polarity inversion for input ports
• Open-drain interrupt output

I/o Expanders Applications

• ACPI power switches
• Sensors
• Push-buttons
• LEDs
• Fans

I/o Expanders Procurement Notes

Verify the specific Q900 suffix confirms AEC-Q100 compliance and the extended temperature rating of -40 °C to +125 °C. Confirm the TSSOP16 package type matches the design requirements. Ensure the ordering part number aligns with the reel pack SMD method specified in the manufacturer documentation.

I/o Expanders Selection Notes

Select this variant when automotive reliability and high-temperature operation are required. The 3.0 V minimum operating voltage differs from standard versions. Verify that the system controller supports the fixed I2C address structure determined by hardware pins A0 and A1. Ensure the open-drain interrupt output is compatible with the microcontroller's interrupt input logic levels.

I/o Expanders Part Context

This component belongs to the NXP Semiconductors PCA9538 family of I2C-bus I/O expanders. It is specifically designed as an enhanced version for automotive applications. The Q900 designation indicates compliance with AEC-Q100 standards and an extended operating temperature range compared to standard commercial variants.

I/o Expanders Replacement Considerations

The PCA9538PW is functionally identical but lacks the Q900 automotive qualification and extended temperature rating. The PCAL9538A offers agile I/O features but requires verification of register compatibility and different default interrupt states.