The NXP PCA9539RPW is a robust 16-bit I/O expander designed to provide general-purpose remote I/O expansion for most microcontroller families via the I²C-bus interface. This versatile device offers a flexible solution for system designers looking to add more I/O ports to a microcontroller or to circumvent the limitations of the number of I/O pins available in a compact or complex system.

Key Features

• Interface: I²C-bus/SMBus compatible, operating up to 400 kHz.
• Ports: 16-bit I/O ports which can be configured as inputs or outputs.
• Interrupt Output: Configurable interrupt output which can be connected to the interrupt logic of the microcontroller.
• Power Supply: Operating voltage range from 2.3V to 5.5V, making it suitable for a wide variety of applications and logic levels.
• Polarity Inversion: Input port polarity inversion function to adapt to the polarity needs of different microcontrollers.
• Output Drive Capability: Open-drain or quasi-bidirectional output modes.
• Low Standby Current: Suitable for battery-powered applications due to its low standby current.
• Package: Available in TSSOP-24 (thin shrink small outline package) which is ideal for space-constrained applications.

Applications

The PCA9539RPW is suitable for a wide range of applications, including:

• Servers
• Personal computers
• Industrial control
• Battery management
• Medical equipment
• Home automation

Easy Integration

With its simple I²C-bus interface, the PCA9539RPW can be easily integrated into existing systems, offering a seamless way to expand the available I/O without the need for significant hardware changes or complex wiring. Its compatibility with various microcontroller logic levels ensures that it can be used in diverse environments without the need for additional level shifters.