NCA9595PW-Q100J

I/o Expanders Overview

The NCA9595PW-Q100J is a low-voltage 16-bit I/O expander designed for I²C-bus and SMBus applications. It provides General Purpose Input/Output expansion with an interrupt output, configuration registers, and programmable pull-up resistors. The device operates within a wide voltage range of 1.65 V to 5.5 V and supports Fast-mode communication up to 400 kHz. It features Schmitt-trigger inputs, noise filters, and 5 V tolerant I/Os. Packaged in a TSSOP24 (SOT355-1) format, it is qualified to AEC-Q100 Grade 1 standards for automotive use across temperatures from -40 °C to +125 °C.

I/o Expanders Feature Summary

• Automotive qualification compliant with AEC-Q100 Grade 1 specifications
• Configurable internal pull-up resistors on all GPIO pins
• Open-drain active LOW interrupt output triggered by input state changes
• Hardware selectable slave addresses allowing up to eight devices on one bus

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Fan control systems

I/o Expanders Procurement Notes

Verify the component matches the specific Nexperia part number NCA9595PW-Q100J. Confirm the package type is TSSOP24 and that the device holds valid AEC-Q100 Grade 1 certification. Ensure the operating temperature range meets the required -40 °C to +125 °C specification for the intended application environment.

I/o Expanders Selection Notes

Select this component when expanding microcontroller I/O capacity via I²C or SMBus interfaces is required. It is suitable for designs needing configurable pull-ups and interrupt-driven input monitoring. Consider its 5 V tolerance if interfacing with higher voltage logic levels while maintaining a lower core supply voltage.

I/o Expanders Part Context

This device belongs to the Nexperia NCA9595-Q100 series of low-voltage I/O expanders. It is specifically engineered for automotive electronics, offering robust performance under varying thermal conditions. The product integrates multiple configuration registers to manage input/output directions and polarity inversion efficiently.

I/o Expanders Replacement Considerations

Direct substitutes include other Nexperia I/O expanders within the same family that share identical pinouts and register maps. Verify compatibility regarding the TSSOP24 package dimensions and the specific AEC-Q100 grade requirements before substitution.

I/o Expanders FAQ

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

At power-on reset, all I/O pins default to high-impedance input states. The internal pull-up resistors are enabled by default but can be disabled via the configuration pull-up registers.

What determines the I²C slave address?

The slave address is determined by three hardware address pins: A0, A1, and A2. These pins can be connected to VCC or GND to select one of eight possible addresses.

Can the interrupt output be used for output pin changes?

No. An interrupt is generated only by rising or falling edges of port inputs when they are configured in Input mode. Changing an I/O from output to input may cause false interrupts if the pin state does not match the input register.