Product Overview: PCA9538PW/Q900,118 from NXP Semiconductors

The PCA9538PW/Q900,118 is a robust, low-voltage 8-bit I²C-bus and SMBus low power I/O expander designed and manufactured by NXP Semiconductors. This versatile component is engineered to provide general-purpose remote I/O expansion for most microcontroller families, which is especially useful when the number of available GPIOs (General Purpose Input/Output) on the microcontroller is limited.

The PCA9538PW/Q900,118 operates at an I²C-bus frequency of up to 400 kHz and provides an interface between a parallel bus and an I²C-bus. It consists of multiple 8-bit configuration, input, output, and polarity inversion registers. Each I/O can be used as an input or output without the use of a data-direction control signal. This provides a high level of flexibility and ease of use.

The device is housed in a TSSOP16 (Thin Shrink Small Outline Package) with a body width of 4.4 mm, making it suitable for space-constrained applications. It supports a wide operating voltage range from 2.3V to 5.5V, which allows for use in various system designs without the need for additional level shifters.

Features of the PCA9538PW/Q900,118 include an active LOW interrupt output which can be connected to the interrupt logic of the microcontroller. This feature signals the microcontroller that an input state has changed, thus eliminating the need for the microcontroller to continuously poll the input status. This results in a more efficient use of the microcontroller's processing bandwidth and power consumption.

Additionally, the PCA9538PW/Q900,118 offers built-in power-on reset, a noise filter on the SCL/SDA inputs, and an 8-bit serial input/output port expander with interrupt output. Its latch-up performance exceeds 100 mA per JESD 78, Class II, making it a reliable choice for various applications.

The PCA9538PW/Q900,118 is ideal for use in servers, personal electronics, and industrial control systems, where additional I/Os are needed. Its ease of use and integration, along with NXP's reputation for quality, make it a valuable component for designers looking to expand the capabilities of their microcontroller-based systems.