Introducing the PCA9673D 16-bit I/O Expander from NXP

The PCA9673D is a robust 16-bit I/O (Input/Output) expander produced by NXP Semiconductors, designed to provide additional I/O capabilities to microcontrollers via the I²C-bus interface. This versatile component is ideal for use in applications where I/O pins on a microcontroller are limited and need to be expanded efficiently and cost-effectively.

Key Features

• Interface: The PCA9673D operates via an I²C-bus/SMBus interface, which supports up to 400 kHz (Fast-mode) or 1000 kHz (Hs-mode) clock frequencies, making it compatible with a wide range of microcontrollers and systems.
• Ports: It offers 16-bit quasi-bidirectional I/O ports, which can be independently assigned as inputs or outputs, providing flexibility for a variety of design needs.
• Voltage Range: The device can work over a wide supply voltage range from 2.3 V to 5.5 V, accommodating various logic levels and allowing it to be used in both 3.3 V and 5 V systems.
• Output Drive Capability: The PCA9673D has high current sink capabilities for directly driving LEDs while also providing high-impedance outputs.
• Power Management: An active LOW reset input allows the PCA9673D to be reset by external hardware, ensuring reliable operation and easy integration into system power-on sequences.
• Interrupt Output: An interrupt output is available, which can be configured to reflect the status of the input ports, thereby providing a mechanism for the host controller to detect input changes without the need for constant polling.
• Addressing: Up to eight PCA9673D devices can be connected to the same I²C-bus/SMBus, allowing for the expansion of up to 128 I/Os, thanks to its three hardware address pins.
• Package: The device is available in a 24-pin TSSOP package, ensuring a compact footprint for space-constrained applications.

Applications

The PCA9673D is suitable for a wide range of applications, including:

• Servers
• Industrial control
• Medical equipment
• Gaming machines
• Home automation systems
• Personal electronics

With its extensive feature set and versatile I/O expansion capabilities, the NXP PCA9673D is an excellent choice for designers looking to enhance the functionality of their systems without increasing the complexity or cost of their microcontroller unit.