PCA9554CPWJ

I/o Expanders Overview

The PCA9554CPWJ is an NXP Semiconductors low-voltage 8-bit I2C-bus and SMBus GPIO expander with interrupt output and weak pull-up resistors. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting Fast-mode communication up to 400 kHz. The device features open-drain outputs with 25 mA sink capability for direct LED driving and includes Schmitt-trigger inputs for noise immunity. Packaged in TSSOP16 (SOT403-1), it provides eight configurable I/O pins controlled via four registers: Input, Output, Polarity Inversion, and Configuration. Hardware address pins A0-A2 allow up to eight devices on the bus.

I/o Expanders Feature Summary

• I2C-bus to parallel port expander with interrupt generation
• Wide operating power supply voltage range from 1.65 V to 5.5 V
• Open-drain active LOW interrupt output for input state changes
• Internal weak pull-up resistors eliminate external components

I/o Expanders Applications

• ACPI power switches
• Sensor interface circuits
• Push button scanning systems
• LED control applications
• Fan control modules

I/o Expanders Procurement Notes

Verify the ordering part number PCA9554CPWJ matches the required TSSOP16 package and temperature range (-40 C to +85 C). Confirm the suffix 'J' indicates reel packing. Ensure the specific variant corresponds to the PCA9554C fixed address family rather than the B series to prevent I2C bus conflicts in multi-device designs.

I/o Expanders Selection Notes

Select this component when interfacing with microprocessors requiring additional GPIOs while minimizing interconnections. The wide VDD range supports next-generation low-power controllers. Choose the PCA9554C variant specifically to utilize its distinct base I2C address compared to the PCA9554B, allowing double the device density on a single bus without address collisions.

I/o Expanders Part Context

The PCA9554CPWJ belongs to the PCA9554B/C family, which serves as a pin-to-pin replacement for legacy industry-standard parts. The PCA9554C specifically replaces the PCA9554A. More feature-rich variants like the PCAL9554B/C are available with Agile I/O capabilities. This device maintains compatibility with standard I2C/SMBus protocols while offering enhanced low-power operation.

I/o Expanders Replacement Considerations

The PCA9554BPW is a compatible alternative within the same family but utilizes a different fixed I2C address base. Designers must verify address allocation if substituting between the B and C series to avoid bus conflicts.