NCA9535BYHP

I/o Expanders Overview

The NCA9535BYHP is a low-voltage 16-bit I²C and SMBus I/O expander manufactured by Nexperia, housed in an HWQFN24 package. It operates within a supply voltage range of 1.65 V to 5.5 V and supports Fast-mode clock frequencies up to 400 kHz. The device provides 16 configurable General Purpose Input/Output pins with open-drain interrupt output capability. It features Schmitt-trigger inputs for noise immunity and includes internal power-on reset functionality. The operating temperature range extends from -40 °C to +85 °C.

I/o Expanders Feature Summary

• I²C-bus to parallel port expansion with hardware-selectable slave addresses
• Open-drain active LOW interrupt output triggered by input state changes
• Schmitt-trigger action on SCL and SDA inputs for improved noise immunity
• Internal power-on reset ensuring glitch-free initialization at startup

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button matrix scanning
• LED control systems
• Fan speed control circuits

I/o Expanders Procurement Notes

Verify the specific ordering suffix BYHP corresponds to the HWQFN24 package variant during procurement. Confirm that the intended application environment remains within the specified -40 °C to +85 °C operating temperature range. Ensure pull-up resistors are correctly sized for the I²C bus lines and interrupt output to guarantee signal integrity.

I/o Expanders Selection Notes

Select this component when 16 GPIOs are required via a standard I²C interface. The HWQFN24 package is suitable for space-constrained designs requiring thermal efficiency. Consider the 5 V tolerant I/Os if interfacing with higher voltage logic levels while maintaining a lower core supply voltage.

I/o Expanders Part Context

This part belongs to the NCA9535 series of low-power I/O expanders. It shares functional similarities with other members like the NCA9535PW (TSSOP24) but differs in physical footprint. The series is designed to minimize interconnections in embedded systems requiring additional digital I/O capabilities over serial buses.

I/o Expanders Replacement Considerations

NCA9535PW serves as a pin-compatible alternative in a TSSOP24 package.