PCAL9554BBSHP

I/o Expanders Overview

The PCAL9554BBSHP is an NXP Semiconductors low-voltage 8-bit General Purpose Input/Output (GPIO) expander designed for I2C-bus and SMBus applications. It features Agile I/O capabilities, including programmable output drive strength, latchable inputs, and configurable pull-up/pull-down resistors. The device operates within a wide supply voltage range of 1.65 V to 5.5 V and supports Fast-mode I2C communication at up to 400 kHz. It includes an open-drain active LOW interrupt output (INT) that activates when input states change. The part is housed in a 16-terminal HVQFN package with dimensions of 3 x 3 x 0.85 mm.

I/o Expanders Feature Summary

• Agile I/O functionality providing programmable output drive strength, input latching, and selectable internal pull-up or pull-down resistors.
• Open-drain interrupt output (INT) that signals the system master upon any input state change, supporting event-driven designs.
• Wide operating power supply voltage range from 1.65 V to 5.5 V, enabling compatibility with various microprocessor and microcontroller supply levels.
• Internal power-on reset ensures registers initialize to default values without glitches on power-up.

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button matrix control
• LED driver expansion
• Fan control systems

I/o Expanders Procurement Notes

Verify the ordering suffix HP indicates reel packing in 13-inch Q2/T3 format. Confirm the specific B variant address base matches your I2C bus topology requirements against existing devices. Ensure the HVQFN16 thermal pad soldering process is defined for proper heat dissipation and electrical grounding.

I/o Expanders Selection Notes

Select the PCAL9554B variant over the C variant based on the fixed I2C-bus address bits required to avoid conflicts with other slaves on the bus. Consider the Agile I/O features if programmable drive strength or input latching is necessary compared to standard PCA9554 devices. Verify the 1.65 V minimum supply voltage meets the lowest system rail availability.

I/o Expanders Part Context

The PCAL9554BBSHP belongs to the PCAL9554 family, which serves as a pin-for-pin replacement for the PCA9554 series while adding Agile I/O enhancements. The 'BS' designation identifies the HVQFN16 plastic thermal enhanced very thin quad flat package. This component extends the I/O capabilities of microcontrollers via the I2C interface, reducing board interconnections.

I/o Expanders Replacement Considerations

The PCAL9554B is a direct pin-for-pin replacement for the PCA9554. Software backward compatibility exists with PCA9554 and PCA9554A families, though Agile I/O registers require additional configuration. Note that the PCAL9554B powers up with all interrupts masked by default.