PCA9554APW,112

I/o Expanders Overview

The PCA9554APW,112 is an 8-bit I/O expander designed for I2C-bus and SMBus applications. 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 five hardware address pins (A0, A1, A2) that allow multiple units on the same bus. It includes an open-drain interrupt output, polarity inversion registers, and internal power-on reset logic. The component is housed in a TSSOP16 package and functions as a general-purpose parallel input/output expansion solution.

I/o Expanders Feature Summary

• Provides 8 bits of general-purpose parallel input/output expansion for I2C-bus and SMBus systems
• Features an active LOW open-drain interrupt output to signal input state changes
• Includes individual I/O configuration registers allowing each pin to be set as input or output
• Supports hardware-selectable addressing via three address pins to accommodate multiple devices

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button matrix scanning
• LED control circuits
• Fan speed monitoring and control

I/o Expanders Procurement Notes

Verify the specific ordering suffix matches the required packaging format. Confirm the fixed I2C slave address corresponds to the PCA9554 variant rather than the PCA9554A variant to ensure correct bus addressing. Check RoHS compliance status and verify the operating temperature range requirements against the datasheet specifications before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when an 8-bit GPIO expansion is required with interrupt capabilities. Ensure the system controller supports I2C or SMBus protocols. Verify that the 5 V tolerant I/Os match the target subsystem voltage levels. Consider the TSSOP16 package dimensions for PCB layout constraints and confirm the maximum current limits per pin are not exceeded during operation.

I/o Expanders Part Context

This part belongs to the PCA9554 family of CMOS I/O expanders developed by NXP Semiconductors. It serves as an enhancement over earlier PCF8574 series devices, offering higher drive capability and lower supply current. The PCA9554APW,112 specifically denotes the standard marking version in a TSSOP16 package, distinct from the PCA9554A which utilizes a different fixed I2C address.

I/o Expanders Replacement Considerations

Direct pin-to-pin replacements require software modifications due to register differences. The PCF8574 series is compatible but lacks enhanced features. Verify that any substitute maintains the 400 kHz clock frequency and interrupt functionality.