PCA6416AHF,128

I/o Expanders Overview

The PCA6416AHF,128 is a 16-bit I/O expander providing remote expansion for microcontrollers via the I2C-bus interface. It features bidirectional voltage-level translation between VDD(I2C-bus) and VDD(P), supporting operating supply voltages from 1.65 V to 5.5 V. The device includes an active LOW reset input, an open-drain interrupt output, and Schmitt-trigger inputs for noise immunity. It supports Fast-mode I2C communication up to 400 kHz and offers latched outputs with 25 mA drive capability. The HWQFN24 package provides a compact solution for mixed-signal environments.

I/o Expanders Feature Summary

• Bidirectional voltage-level translation allows seamless communication between low-voltage microprocessors and higher-voltage peripherals.
• Integrated interrupt output signals state changes on input ports without continuous bus polling.
• Hardware address pin enables two devices to share the same I2C bus.
• Internal power-on reset ensures all channels initialize as high-impedance inputs.

I/o Expanders Applications

• Battery-powered mobile applications requiring minimal interconnections
• Interfacing sensors, push buttons, and keypads to microcontrollers
• Connecting processors running at one voltage level to I/O devices at different levels

I/o Expanders Procurement Notes

Verify the ordering suffix ',128' corresponds to the HWQFN24 package in reel pack format. Confirm the specific revision of the datasheet matches the production batch requirements. Ensure the supplier provides traceability documentation consistent with NXP Semiconductors standards for this component type.

I/o Expanders Selection Notes

Select this part when dual power rails are required for voltage translation between the I2C master and peripheral ports. The HWQFN24 package is suitable for space-constrained designs. Verify that the system voltage range falls within the 1.65 V to 5.5 V limits for both VDD(I2C-bus) and VDD(P).

I/o Expanders Part Context

This component belongs to the PCA6416A family of low-voltage translating I/O expanders. It serves as a hardware interface solution for expanding GPIO capabilities in embedded systems. The device simplifies system design by reducing the number of direct connections between the main processor and external peripherals.

I/o Expanders Replacement Considerations

The PCAL6416A is a pin-to-pin replacement offering Agile I/O features. Verify software compatibility if interrupts are utilized, as the PCAL6416A disables interrupts at power-up by default compared to the PCA6416A behavior.