PCA9555BSHP

I/o Expanders Overview

The PCA9555BSHP is a 24-pin CMOS device providing 16-bit General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications. It operates within a 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 an active LOW open-drain interrupt output, polarity inversion registers, and internal power-on reset. It includes noise filters on SCL/SDA inputs and provides ESD protection exceeding 2000 V HBM. Packaged in HVQFN24, it defaults to 16 inputs at reset.

I/o Expanders Feature Summary

• Provides 16-bit GPIO expansion with individual input/output configuration capabilities
• Features an active LOW open-drain interrupt output triggered by input state changes
• Includes polarity inversion registers to adjust read register data polarity
• Offers 5 V tolerant I/Os with integrated noise filters on serial communication lines

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix HP against the manufacturer's current documentation to confirm package orientation and reel specifications. Ensure the component matches the required HVQFN24 thermal pad soldering requirements for proper ground connection and heat dissipation during assembly.

I/o Expanders Selection Notes

Select this component when 16-bit I/O expansion is required on an I2C bus with interrupt notification needs. Consider the 2.3 V to 5.5 V operating range and 5 V I/O tolerance for compatibility with various system voltages. Verify that the HVQFN24 package fits the PCB layout constraints and thermal design requirements.

I/o Expanders Part Context

The PCA9555 series enhances NXP Semiconductors' I2C-bus I/O expanders with higher drive capability and lower supply current. While pin-to-pin and address compatible with PCF8575, software changes are required due to enhancements. The BSHP variant specifically denotes the HVQFN24 package with standard marking in a reel pack format.

I/o Expanders Replacement Considerations

PCF8575 is pin-to-pin and address compatible but requires software changes due to functional enhancements in the PCA9555.