NXP PCA9556 8-bit I²C-bus and SMBus I/O Port with Interrupt

The NXP PCA9556 is an 8-bit General Purpose Input/Output (GPIO) expander designed for I²C-bus and SMBus applications. This versatile device enables a host controller to communicate with multiple I/Os via a two-wire serial interface, which greatly expands the available GPIO without the need for additional pins on the host processor.

Key Features

• I²C Interface: Supports 400 kHz I²C-bus and SMBus serial interface, allowing for easy integration into existing systems.
• 8-bit I/O Ports: Features eight programmable I/O pins that can be configured as either inputs or outputs, providing flexibility for a wide range of applications.
• Interrupt Output: Includes an interrupt output which can be configured to reflect the status of the input pins, thus enabling the host controller to respond to input changes without polling the device.
• Low Standby Current: Optimized for low power consumption, making it suitable for battery-powered devices.
• Address Pins: Three hardware address pins allow up to eight PCA9556 devices on the same bus, providing up to 64 additional I/Os.
• Software Reset: Features a software reset function, allowing the device to be reset through the I²C-bus.

Applications

The PCA9556 is ideal for a variety of applications where additional I/Os are required, such as:

• Servers
• Personal Computers
• Industrial Control
• Embedded Systems
• Consumer Electronics

With its easy-to-use interface and robust feature set, the NXP PCA9556 is a highly effective solution for expanding I/O capabilities in a wide range of electronic systems. Its small package size also makes it well-suited for space-constrained applications.