The NXP PCA9539APW is a robust, high-performance 16-bit I/O expander designed to provide additional GPIO capabilities to microcontroller systems via the I²C-bus and SMBus. This device is particularly useful in situations where the microcontroller needs to control more devices than the number of available pins it has.

Key Features

• 16-bit Input/Output port expander with interrupt output
• I²C-bus to parallel port expander
• Operating power supply voltage range of 2.3V to 5.5V
• 400 kHz I²C-bus interface (Fast-mode I²C)
• Active LOW interrupt output
• Low standby current
• Compatible with most microcontrollers
• 40-bit I²C-bus address for use with up to 64 devices on the same bus
• Available in TSSOP24 package

Applications

The PCA9539APW is versatile and can be used in a wide array of applications. These include, but are not limited to:

• Servers
• Personal computers
• Industrial control
• Medical equipment
• Mobile phones
• Consumer electronics

Product Description

The PCA9539APW by NXP is a 24-pin TSSOP (Thin Shrink Small Outline Package) device that offers a simple solution to expand the I/O capabilities of an I²C-bus. Each of the 16 I/O pins can be individually configured as an input or output, allowing for a flexible adaptation to specific needs. The device's interrupt output can be connected to the interrupt logic of the microcontroller, thereby ensuring that the microcontroller is notified of any input changes without the need for constant polling.

With its wide operating voltage range and low power consumption, the PCA9539APW is ideal for battery-operated devices. The I²C-bus interface supports standard and fast modes, making it suitable for a broad spectrum of speed requirements. Its robust design and ease of integration make it a preferred choice for engineers and designers looking to enhance their systems with additional I/Os without incurring significant costs or complexity.