NXP PCA9538BS,118 - 8-bit I²C and SMBus Low Power I/O Port with Interrupt

The PCA9538BS,118 is a highly versatile 8-bit I²C-bus and SMBus low power I/O port with interrupt functionality, designed and manufactured by NXP Semiconductors. This integrated circuit is part of a robust family of I/O expanders that provides a simple solution when additional I/Os are needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.

Equipped with an 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion registers, the PCA9538BS,118 allows each I/O to be configured as an input or output. This level of configuration flexibility enables the host controller to monitor the status of the inputs, including the detection of rising or falling edges, which can signal an interrupt via the interrupt output.

Operating over a power supply range of 2.3V to 5.5V, this device is optimized for low power consumption and is suitable for battery-powered applications. It can interface with 5V systems as well as 3.3V systems, making it extremely versatile for a wide range of applications. The PCA9538BS,118 supports both the standard mode (100 kHz) and the fast mode (400 kHz) of I²C communication, making it an excellent choice for systems that require a fast response time or operate at higher bus speeds.

The PCA9538BS,118 comes in a space-saving 16-pin TSSOP package, which is ideal for applications with limited PCB space. The device also includes an active LOW interrupt output which, when connected to the host controller, can signal an immediate response to an input change, thus reducing the need for the controller to continuously poll the inputs.

With its built-in power-on reset, the PCA9538BS,118 ensures that the I/Os are configured as inputs at power-up, preventing unintended outputs that could cause system issues. Its robust design includes built-in low current consumption and high noise immunity features, making it a reliable choice for complex electronic systems.

Overall, the NXP PCA9538BS,118 is a highly efficient solution for system expansion and is particularly useful for server management, industrial control, and automotive applications, where additional I/Os and interrupt-driven functionality are required.