PCAL9722HN/Q900HP

I/o Expanders Overview

The PCAL9722HN/Q900HP is a 22-bit general-purpose I/O expander featuring an SPI interface and Agile I/O capabilities. It supports bidirectional voltage translation between the SPI bus (1.1 V to 5.5 V) and Port P (1.8 V, 2.5 V, 3.3 V, or 5.5 V). The device operates at SCLK speeds up to 5 MHz with low standby current of 2.0 μA typical at 3.3 V. It includes Schmitt trigger inputs, noise filters, and an active LOW reset input. The interrupt output is open-drain and active LOW. ESD protection exceeds JESD 22 standards, and latch-up performance exceeds 100 mA per JESD 78 Class II.

I/o Expanders Feature Summary

• Agile I/O features including programmable drive strength, input latching, and configurable pull-up/pull-down resistors
• Bidirectional voltage-level translation allowing direct connection to microcontrollers operating down to 1.1 V
• Interrupt functionality with edge specification, individual clear capability, and switch debounce hardware

I/o Expanders Applications

• Battery-powered mobile applications for interfacing to sensors and push buttons
• Mixed power supply systems requiring communication between incompatible I/O voltages
• Remote I/O expansion for microcontroller families via SPI interface

I/o Expanders Procurement Notes

Verify the specific suffix HP against official NXP documentation to confirm availability and exact automotive qualification status. Ensure the ordering information matches the required temperature range and package type. Confirm compliance with AEC-Q100 Grade 1 requirements if intended for automotive use. Contact NXP support for PPAP documentation when necessary.

I/o Expanders Selection Notes

Select this component when 22 GPIOs are needed with SPI connectivity and mixed-voltage operation. Consider the Agile I/O features for reducing external components like discrete pull-ups. Verify that the host microcontroller supports SPI communication and can handle the address configuration via the ADDR pin. Check voltage levels on both the SPI bus and Port P to ensure compatibility.

I/o Expanders Part Context

The PCAL9722HN/Q900HP belongs to the PCAL9722 series of ultra-low-voltage translating I/O expanders. It is designed by NXP Semiconductors to provide remote I/O expansion with minimal interconnections. The device simplifies system design by integrating level shifting and configurable I/O features into a single HVQFN32 package.

I/o Expanders Replacement Considerations

PCAL9722HN: Standard commercial grade version without automotive qualification.