PCA9554ABS,118

I/o Expanders Overview

The PCA9554ABS,118 is an 8-bit I2C-bus and SMBus I/O expander from NXP Semiconductors. It provides General Purpose parallel Input/Output (GPIO) expansion for I2C applications. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It features 8 I/O pins that default to inputs at reset, with individual configuration capabilities. The component utilizes an open-drain interrupt output to signal input state changes. It is housed in a 16-terminal HVQFN package measuring 4 x 4 x 0.85 mm.

I/o Expanders Feature Summary

• Provides 8-bit GPIO expansion via I2C/SMBus interface
• Features active LOW interrupt output for input state change notification
• Includes polarity inversion register for flexible logic operation
• Supports hardware-selectable addresses via A0, A1, and A2 pins

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button scanning
• LED control systems
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix

I/o Expanders Selection Notes

Select this variant when a compact 4x4 mm footprint is required. Ensure the system design accommodates the exposed thermal pad on the HVQFN package for proper heat dissipation and grounding. Confirm that the fixed I2C address associated with the 'A' series matches the bus allocation requirements.

I/o Expanders Part Context

This part belongs to the PCA9554 family, which enhances previous NXP I/O expanders with higher drive capability and lower supply current. It maintains pin-to-pin compatibility with the PCF8574 series but requires software adjustments due to enhanced features like the interrupt output and polarity inversion registers.

I/o Expanders Replacement Considerations

PCA9554BS,118 shares the same HVQFN16 package but uses a different fixed I2C address.