PCA9555PW/DG,118

I/o Expanders Overview

The PCA9555PW/DG,118 is a 24-pin CMOS device providing 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus and SMBus applications. It operates within a power supply voltage range of 2.3 V to 5.5 V and features 5 V tolerant I/Os. The device includes an active LOW interrupt output, polarity inversion registers, and noise filters on SCL/SDA inputs. It supports clock frequencies from 0 Hz to 400 kHz and offers ESD protection exceeding 2000 V HBM. The package is TSSOP24.

I/o Expanders Feature Summary

• Provides 16-bit GPIO expansion with individual input/output configuration via configuration registers.
• Features an open-drain active LOW interrupt output that activates when input states change.
• Includes polarity inversion registers to allow active HIGH or active LOW operation.
• Supports up to eight devices sharing the same bus through three hardware address pins.

I/o Expanders Applications

• ACPI power switches
• Sensors and push buttons
• LED control and fans

I/o Expanders Procurement Notes

Verify the ordering suffix '118' corresponds to the specific reel packing method required for your assembly line. Confirm the package type matches the footprint design. Ensure the operating temperature range meets system requirements.

I/o Expanders Selection Notes

Select this component when additional I/O ports are needed for I2C-based systems. Consider the 5 V tolerance if interfacing with higher voltage logic. Verify pin compatibility if replacing older PCF8575 designs, as software changes may be necessary.

I/o Expanders Part Context

This part belongs to the NXP PCA9555 family of 16-bit I/O expanders. It enhances previous generations with higher drive capability and lower supply current. The device is designed to simplify system design by reducing pin count requirements on the main controller.

I/o Expanders Replacement Considerations

Direct pin-to-pin compatible replacements include other variants in the PCA9555 series such as PCA9555D or PCA9555DB. Note that while physically compatible with PCF8575, software modifications are required due to functional enhancements.