NXP PCA9555D,112 - 16-bit I²C-bus and SMBus I/O Expander

The PCA9555D,112 is a robust 16-bit I/O expander from NXP Semiconductors designed to provide additional digital I/O interfaces to a microcontroller via the I²C-bus and SMBus. This versatile component is an ideal solution for applications that require expanded I/O capabilities, such as servers, industrial control, robotics, and more.

With its two 8-bit Configuration, Input, Output, and Polarity Inversion registers, the PCA9555D,112 allows each I/O to be configured as an input or output. This flexibility ensures that developers can customize the device to meet the specific needs of their applications. Additionally, the Polarity Inversion feature allows users to invert the polarity of the Input Port register data, providing further adaptability.

The device operates at supply voltages ranging from 2.3V to 5.5V, making it suitable for a wide array of applications and compatible with most microcontrollers. Furthermore, the PCA9555D,112 supports both the standard-mode (100 kHz) and the fast-mode (400 kHz) I²C protocols, providing a high-speed interface when necessary.

One of the key features of the PCA9555D,112 is its built-in oscillator, which eliminates the need for an external clock and reduces the overall component count in the system design. This integrated oscillator, along with the active LOW interrupt output, allows for immediate notification of input changes without the need to continuously poll the input registers, thus optimizing system efficiency and reducing the microcontroller's workload.

The PCA9555D,112 comes in a space-saving 24-pin TSSOP package, which is ideal for space-constrained applications. Moreover, NXP's commitment to quality and reliability ensures that this I/O expander performs consistently across various environmental conditions and throughout its operational lifespan.

Overall, the PCA9555D,112 from NXP is a high-performance, flexible solution for system designers looking to expand the I/O capabilities of their microcontroller-based systems without compromising on space or power efficiency.