PCA6408ABSHP

I/o Expanders Overview

The PCA6408ABSHP is an 8-bit I/O expander from the PCA6408A series, manufactured by NXP Semiconductors. It provides remote I/O expansion for microcontrollers via the I2C-bus interface and supports SMBus communication. The device features bidirectional voltage-level translation between the I2C bus (VDD(I2C-bus)) and Port P (VDD(P)), with both supply rails operating within a range of 1.65 V to 5.5 V. It operates at a maximum clock frequency of 400 kHz and includes an open-drain interrupt output and an active-low reset input. The component is housed in an HVQFN16 package and functions within an ambient temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Bidirectional voltage-level translation capability between I2C bus and Port P supplies
• Open-drain interrupt output indicating input state changes
• Active-low hardware reset input for system initialization
• Programmable polarity inversion register for input signals

I/o Expanders Applications

• Battery-powered mobile applications requiring minimal interconnections
• Interfacing sensors, push buttons, or keypads to microcontrollers
• Connecting processors running at one voltage level to peripherals at a different voltage level

I/o Expanders Procurement Notes

Verify the specific ordering suffix HP corresponds to the HVQFN16 package and reel packing method as documented in the official NXP datasheet. Confirm that the part number matches the exact thermal enhanced very thin quad flat package specifications required for the design. Ensure compliance with the stated RoHS directives before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when mixed-signal environments require seamless communication between low-voltage microprocessors and higher-voltage peripherals. The dual power rail architecture allows independent voltage selection for the interface and port sides. Verify that the required I/O count does not exceed eight bits and that the application benefits from the integrated level shifting feature to simplify circuit design.

I/o Expanders Part Context

This component belongs to the PCA6408A family of low-voltage I/O expanders. It shares functional similarities with other NXP devices like the PCA9538ABSHP but distinguishes itself through its specific bidirectional level-shifting capabilities and dual-supply architecture. The ABSHP designation identifies the specific surface-mount packaging variant within the broader product line.

I/o Expanders Replacement Considerations

Direct substitutes include other parts from the PCA6408A family such as PCA6408APW or PCA6408AHK, provided the package type matches the PCB layout requirements. Cross-family replacements like the PCA9538ABSHP may be considered if voltage translation features are not strictly required.