NCA9539PW-Q100J

I/o Expanders Overview

The NCA9539PW-Q100J is a low-voltage 16-bit I/O expander designed for automotive applications, qualified to AEC-Q100 Grade 1 standards. It provides General Purpose Input/Output expansion with interrupt and reset capabilities for I2C-bus/SMBus systems. The device operates within a supply voltage range of 1.65 V to 5.5 V and supports Fast-mode clock frequencies up to 400 kHz. It features Schmitt-trigger inputs for noise immunity and includes an open-drain active LOW interrupt output. The component is housed in a TSSOP24 package (SOT355-1) and functions across a temperature range from -40 °C to +125 °C.

I/o Expanders Feature Summary

• Automotive-grade qualification compliant with AEC-Q100 Grade 1 specifications
• Configurable polarity inversion registers for input signal manipulation
• Active LOW external reset pin for system state initialization without power cycling
• Hardware-selectable slave addresses allowing multiple devices on a single bus

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix 'J' against the manufacturer's current documentation to confirm tape and reel packaging details. Ensure the selected variant matches the required thermal performance and package dimensions for the target PCB layout. Cross-reference the revision number to validate functional compatibility with existing designs.

I/o Expanders Selection Notes

Select this component when designing systems requiring robust GPIO expansion under strict automotive environmental conditions. The wide operating voltage range facilitates integration with various microcontroller logic levels. Verify that the application requires the specific interrupt and reset functionalities provided by this integrated circuit architecture.

I/o Expanders Part Context

This part belongs to the Nexperia NCA9539-Q100 family of low-power I/O expanders. It serves as a specialized automotive version of standard I/O controllers, offering enhanced reliability and extended temperature ranges suitable for harsh vehicle environments while maintaining electrical compatibility with general-purpose interfaces.

I/o Expanders Replacement Considerations

The PCAL9539A offers similar functionality but lacks explicit automotive qualification data in the provided source material. Direct substitution requires verifying that the alternative meets the specific AEC-Q100 Grade 1 requirements and thermal limits mandated by the original design.

I/o Expanders FAQ

How are the I/O pins configured at power-up?

At power-up, all I/O pins default to high-impedance input states due to the internal power-on reset mechanism.

What is the function of the RESET pin?

The RESET pin allows the device to be returned to its default register values and initializes the state machine without requiring a full power cycle.

How does the interrupt output operate?

The INT pin is an open-drain active LOW output that activates when any GPIO input changes state relative to its corresponding input port register.