PCA9535CHF,118

I/o Expanders Overview

The PCA9535CHF,118 is a 24-pin CMOS device providing 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications. It operates within an operating power supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The device features 5 V tolerant I/Os, low standby current, and ESD protection exceeding 2000 V HBM. It includes an active LOW interrupt output, polarity inversion registers, and noise filters on SCL/SDA inputs. The component is offered in the HWQFN24 package with dimensions of 4 x 4 x 0.75 mm.

I/o Expanders Feature Summary

• Provides 16-bit GPIO expansion via I2C-bus/SMBus interface
• Features active LOW open-drain interrupt output triggered by input state changes
• Includes individual I/O configuration and polarity inversion capabilities
• Supports up to eight devices sharing the same bus using three hardware address pins

I/o Expanders Applications

• ACPI power switches
• Sensors
• Push buttons
• LEDs
• Fans

I/o Expanders Procurement Notes

Verify the specific ordering suffix ',118' corresponds to the HWQFN24 package and reel packing method as defined in the official NXP datasheet. Confirm that the 'PCA9535C' variant designation matches the requirement for high-impedance open-drain outputs rather than the standard PCA9535 totem pole outputs. Ensure the supplier documentation explicitly references the Rev 6 product data sheet for accurate technical specifications.

I/o Expanders Selection Notes

Select this component when 16-bit I/O expansion is required with minimal power consumption and 5 V tolerance. The PCA9535C variant is suitable for designs requiring open-drain outputs. Verify compatibility with existing I2C bus addresses and ensure the system master software accounts for register enhancements compared to legacy PCF8575 devices. Consider the HWQFN24 package constraints for PCB thermal design and soldering requirements.

I/o Expanders Part Context

The PCA9535CHF,118 belongs to the PCA9535 family of 16-bit I2C-bus and SMBus low power I/O ports with interrupt. This family was developed to enhance previous NXP Semiconductors I2C-bus I/O expanders by offering higher drive capability, lower supply current, and smaller packaging options. The device shares pin-to-pin and I2C-bus address compatibility with the PCF8575 but requires software adjustments due to architectural improvements.

I/o Expanders Replacement Considerations

The PCA9535CD,118 serves as a direct replacement if the SO24 package is preferred over HWQFN24. The PCA9535CPW,118 is an alternative if TSSOP24 packaging is required. Note that these variants maintain identical electrical characteristics but differ in physical package dimensions and mounting style.