Product Overview: NXP PCA9554D

The NXP PCA9554D is a sophisticated 8-bit I/O expander designed to provide general-purpose remote I/O expansion via the two-line bidirectional I²C-bus (Inter-Integrated Circuit). This integrated circuit is particularly suitable for applications where I/O pins on a microcontroller are limited, and additional inputs/outputs are necessary.

Key Features

• I²C Interface: Compatible with I²C-bus frequencies of 100 kHz, 400 kHz, and 1 MHz, the PCA9554D ensures seamless integration with most microcontrollers and allows for easy serial expansion.
• Eight I/O Pins: The device provides eight programmable I/O pins that can be used as either inputs or outputs. This flexibility allows designers to address a wide range of peripheral devices and sensors without using additional pins on the main processor.
• Interrupt Output: An interrupt output is available and can be configured to alert the host controller when input levels change, thereby reducing the need for the controller to continuously poll the expander.
• Power Supply: Operating from a supply voltage range of 2.3V to 5.5V, the PCA9554D is versatile and can be used in various applications, including battery-powered devices.
• Low Standby Current: It features a low standby current, making it ideal for power-sensitive applications.
• Polarity Inversion: Input port polarity can be inverted, which simplifies the interface to external components by allowing for direct connection without the need for additional inversion logic.

Applications

The PCA9554D is used in a variety of applications, including:

• Servers
• Personal Electronics
• Industrial Control
• Home Automation
• Medical Equipment

Package and Quality

The PCA9554D is available in a 16-pin SOIC package, which is suitable for surface-mount technology (SMT). The device is also compliant with the RoHS (Restriction of Hazardous Substances) directive, ensuring it meets current environmental standards for electronic components.

With its versatile features and wide range of applications, the NXP PCA9554D is a valuable component for designers looking to expand the I/O capabilities of their systems with minimal complexity and footprint.