Product Overview: PCA9673D,118 by NXP Semiconductors

The PCA9673D,118 is a robust and versatile 16-bit I/O expander produced by NXP Semiconductors, a leader in the field of advanced semiconductor solutions. Designed to provide additional I/O capabilities to microcontrollers via the two-line bidirectional I²C-bus (Inter-Integrated Circuit), this device is particularly well-suited for applications where I/O pins are at a premium.

With its operating voltage ranging from 2.3V to 5.5V, the PCA9673D,118 is adaptable to both 3.3V and 5V logic levels, making it a perfect fit for a variety of digital systems. It is also tolerant to 5.5V inputs, which provides additional flexibility in interfacing with different types of logic levels without the need for external components.

Each I/O expander provides 16-bit of quasi-bidirectional input/output port, which can be configured as either an input or an output without the use of a data-direction register, simplifying the software control. This is particularly useful for expanding the number of I/Os in microcontroller-based systems, where pin count is limited.

The PCA9673D,118 features an interrupt output that can be connected to the interrupt logic of the host microcontroller. This interrupt output is activated when any input state differs from its corresponding input port register state and is used to indicate to the host microcontroller that an input state has changed.

Equipped with an internal power-on reset, the PCA9673D,118 ensures that the I/Os are initialized as inputs with a high-impedance state upon power-up, preventing unintended outputs during system startup. Additionally, no-glitch power-up allows outputs to remain stable when the device powers on, which is crucial for applications sensitive to unintended changes in output states.

Furthermore, the device comes in a space-saving TSSOP24 package, making it ideal for space-constrained applications. The PCA9673D,118 also supports the customization of I²C-bus addresses through three address pins, allowing up to eight devices to share the same I²C-bus, thereby expanding the I/Os to a total of 128 signals on a single bus.

In conclusion, the PCA9673D,118 from NXP Semiconductors is a powerful solution for system designers looking to expand the I/O capabilities of their microcontroller-based projects, without incurring significant space or power penalties.