NCA9555PW-Q100J

I/o Expanders Overview

The NCA9555PW-Q100J is a low-voltage 16-bit I/O expander designed for I²C-bus and SMBus applications. It provides General Purpose Input/Output (GPIO) expansion with an operating power supply voltage range of 1.65 V to 5.5 V. The device features 16 I/O pins that default to inputs at power-up, configurable via internal registers. It supports Fast-mode I²C communication up to 400 kHz and includes an open-drain active LOW interrupt output. Qualified to AEC-Q100 Grade 1 standards, it operates within a temperature range of -40 °C to +125 °C. The component is housed in a TSSOP24 package (SOT355-1).

I/o Expanders Feature Summary

• Automotive qualification compliant with AEC-Q100 Grade 1 specifications.
• Wide operating voltage range from 1.65 V to 5.5 V with 5 V tolerant I/Os.
• Configurable 16-bit GPIO with individual input/output direction settings.
• Open-drain interrupt output activated by input state changes.

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button controls
• LED driving circuits
• Fan control systems

I/o Expanders Procurement Notes

Verify the specific ordering suffix J against the manufacturer's current documentation to confirm packaging details such as reel or cut tape configuration. Ensure the requested part matches the TSSOP24 package type and AEC-Q100 automotive grade requirements specified in the datasheet before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when expanding I/O capabilities for microcontrollers using I²C or SMBus interfaces in automotive environments. Consider the 1.65 V to 5.5 V supply range and the requirement for 5 V tolerant inputs if interfacing with higher voltage logic levels. Verify that the TSSOP24 package fits the available PCB space and thermal constraints.

I/o Expanders Part Context

The NCA9555 series serves as a general-purpose I/O expander for I²C/SMBus systems. The NCA9555 variant specifically targets automotive applications, meeting rigorous reliability standards. It offers 16 bits of expandable I/O with configurable polarity and interrupt capabilities, providing a flexible solution for adding peripheral control without increasing MCU pin counts.

I/o Expanders Replacement Considerations

The PCA9555 is functionally similar but lacks AEC-Q100 qualification. Software adjustments may be required due to differences in drive capability and register behavior. Verify compatibility with existing I²C addresses and interrupt handling logic before substitution.