PCAL9554CPWJ

I/o Expanders Overview

The PCAL9554CPWJ 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 supply voltage range of 1.65 V to 5.5 V and supports Fast-mode communication up to 400 kHz. It includes an open-drain active LOW interrupt output and internal power-on reset. The component is housed in a TSSOP16 package.

I/o Expanders Feature Summary

• Agile I/O functionality with programmable output drive strength and input latching
• Configurable internal pull-up and pull-down resistors for floating input management
• Open-drain interrupt output indicating input state changes without continuous polling
• Power-on reset ensures all I/Os initialize as inputs with interrupts masked

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button matrix control
• LED driving and status indication
• Fan control systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'J' corresponds to the required tape and reel packaging configuration. Confirm that the TSSOP16 package variant meets the thermal and mechanical constraints of the target printed circuit board design. Ensure compatibility with existing I2C bus address assignments on the system.

I/o Expanders Selection Notes

Select this model over the PCAL9554B variant due to its distinct fixed I2C-bus address base, which prevents address conflicts when deploying multiple devices on the same bus. Consider the Agile I/O features if programmable drive strength or input latching is required compared to standard PCA9554 equivalents.

I/o Expanders Part Context

This component belongs to the PCAL9554C series, serving as a pin-for-pin replacement for the PCA9554A. It enhances the legacy PCA9554 family by adding Agile I/O features while maintaining software backward compatibility. The 'C' designation specifically indicates the I2C address base used to maximize device density on shared buses.

I/o Expanders Replacement Considerations

PCAL9554BPW serves as a direct pin-compatible alternative utilizing a different I2C address base.