NXP PCA9675PW/S911 Remote 16-bit I/O Expander

The PCA9675PW/S911 from NXP Semiconductors is a sophisticated 16-bit I/O (Input/Output) expander designed to provide additional I/O capabilities to microcontrollers over a two-wire bidirectional I²C-bus. This highly integrated component is an ideal solution for expanding the available I/O ports in a system, particularly in applications where PCB space is at a premium and in complex multi-device environments.

With its compact TSSOP28 (Thin Shrink Small Outline Package) footprint, the PCA9675PW/S911 is engineered for space-constrained applications, offering a seamless and cost-effective method to increase the I/O without the need for additional microcontrollers. The device operates within a supply voltage range of 2.3V to 5.5V, making it suitable for interfacing with both 3.3V and 5V systems and ensuring compatibility with a wide range of microcontrollers and digital systems.

Key features of the PCA9675PW/S911 include:

• 16-bit I/O ports that can be used as either inputs or outputs, configurable via software.
• High-current drive capability per I/O, allowing direct driving of LEDs or other high-drain devices.
• Polarity inversion register for input port data inversion, enabling easy adaptation to different logic levels.
• Low standby current, which is particularly beneficial for battery-powered applications where power conservation is crucial.
• Interrupt output which can be connected to the interrupt logic of the microcontroller, signaling a change in the input port status without the need for continuous polling.
• Internal power-on reset, which puts the registers in their default state, simplifying initialization routines.

The PCA9675PW/S911 is also characterized by its robustness, featuring built-in ESD protection and latch-up testing to 100 mA in accordance with JESD78, ensuring reliable operation even in harsh electrical environments.

Whether you're developing industrial control systems, servers, or any application that requires additional I/O ports with minimal design changes, the PCA9675PW/S911 offers a versatile and reliable solution that can help streamline your design process and enhance overall system capabilities.