PCA9539BSHP

I/o Expanders Overview

The PCA9539BSHP is a 24-pin CMOS device providing 16 bits of general-purpose parallel input/output expansion with interrupt and reset capabilities for I2C-bus/SMBus applications. It operates within an operating power supply voltage range of 2.3 V to 5.5 V, featuring 5 V tolerant I/Os. The device supports clock frequencies from 0 Hz to 400 kHz and includes polarity inversion registers, active LOW interrupt output, and active LOW reset input. It offers low standby current, noise filters on SCL/SDA inputs, and ESD protection exceeding 2000 V HBM. The component is housed in an HVQFN24 package (SOT616-1) and functions across a temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 16-bit I2C-bus GPIO expansion with dedicated interrupt and reset functionality
• Features polarity inversion registers and active LOW interrupt output for flexible logic handling
• Includes internal power-on reset and noise filters on SCL/SDA inputs to ensure stable operation

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button detection
• LED control systems
• Fan monitoring circuits

I/o Expanders Procurement Notes

Verify the specific ordering suffix HP against the manufacturer's official documentation to confirm packaging details and compliance standards. Ensure the HVQFN24 package thermal pad requirements are met during PCB design for proper heat conduction and electrical grounding. Cross-reference the AEC-Q100 qualification status if automotive application requirements apply.

I/o Expanders Selection Notes

Select this component when 16-bit I/O expansion via I2C is required alongside hardware interrupt signaling. Consider the PCA9539R variant if the reset function must preserve register states while only resetting the state machine. Verify that the 2.3 V to 5.5 V supply range aligns with the system's power architecture and that 5 V tolerance is sufficient for bus levels.

I/o Expanders Part Context

The PCA9539 series enhances NXP Semiconductors' family of I2C-bus I/O expanders by offering 16-bit GPIO expansion with interrupt and reset features. It differs from the PCA9555 by removing internal I/O pull-up resistors to reduce power consumption and replacing the A2 address pin with a RESET pin. This design allows for more flexible addressing and direct hardware reset control without de-powering the device.

I/o Expanders Replacement Considerations

PCA9539RBS: Identical HVQFN24 package with different reset behavior where the RESET pin only resets the state machine, preserving register contents.