PCA9554PW/Q900,118

I/o Expanders Overview

The PCA9554PW/Q900,118 is an 8-bit I2C-bus and SMBus I/O expander in a TSSOP16 package. 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 open-drain interrupt outputs and includes polarity inversion registers for flexible logic configuration. It provides 5 V tolerant I/Os and complies with AEC-Q100 automotive standards.

I/o Expanders Feature Summary

• Provides 8 bits of general-purpose parallel input/output expansion via I2C/SMBus interfaces
• Features active LOW interrupt output triggered by input state changes
• Includes polarity inversion register for configurable logic operation

I/o Expanders Applications

• ACPI power switches
• Sensors and push buttons
• LED control circuits
• Fan management systems

I/o Expanders Procurement Notes

Verify the Q900 suffix indicates AEC-Q100 compliance when sourcing automotive-grade units. Confirm the specific tape-and-reel packaging details match production requirements. Ensure the fixed I2C address aligns with system bus topology to prevent conflicts with other expanders.

I/o Expanders Selection Notes

Select this component when 8 additional GPIOs are required on an I2C bus. Use the PCA9554A variant if a different fixed address base is needed to support more devices on the same bus. Verify that the TSSOP16 package dimensions fit the available PCB footprint constraints.

I/o Expanders Part Context

This part belongs to the PCA9554 family of CMOS I/O expanders designed to enhance NXP's I2C portfolio. It offers higher drive capability and lower supply current compared to earlier generations. The Q900 designation specifically denotes the automotive-qualified version of the standard PCA9554PW.

I/o Expanders Replacement Considerations

PCA9554APW/Q900,118 (Different fixed I2C address)

I/o Expanders FAQ

How does the interrupt output function?

The open-drain interrupt output activates when any input state differs from its corresponding Input Port register state, signaling the system master.

What is the default I/O configuration at reset?

At power-on reset, all eight I/O pins are configured as inputs with high-impedance output drivers and weak pull-ups to VDD.

Can multiple devices share the same I2C bus?

Yes, three hardware pins (A0, A1, A2) allow varying the fixed I2C address, enabling up to eight devices on the same bus.