NXP PCA9535CD,118 - 16-bit I²C-bus and SMBus I/O Expander

The PCA9535CD,118 is a robust 16-bit I/O expander from NXP Semiconductors designed to provide additional I/O capabilities to a microcontroller via the I²C-bus or SMBus interface. This versatile component is particularly useful in applications where pins on the microcontroller are limited and additional inputs or outputs are necessary.

With its two 8-bit Configuration, Input, Output and Polarity Inversion registers, the PCA9535CD,118 allows each I/O to be configured as an input or output, making it highly flexible for various use cases. This makes it an ideal solution for expanding the I/O capabilities in a wide range of applications, including sensors, power switches, LEDs, push buttons, and any other peripherals that require digital control.

The device operates over a wide voltage range from 2.3V to 5.5V, allowing it to support both 3.3V and 5V logic levels, and ensuring compatibility with a variety of microcontrollers and systems. This feature is particularly important for battery-operated and power-sensitive applications where maintaining a lower voltage is crucial.

Furthermore, the PCA9535CD,118 features an interrupt output which can be connected to the interrupt logic of the microcontroller. This interrupt output is activated when any input state changes, which is valuable for prompt response to external events without the need for the microcontroller to continuously poll the inputs.

Designed for easy and reliable communication, the device supports standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode plus (1 MHz) I²C-bus protocols. Its address pins allow up to eight devices on the same bus, enabling a single microcontroller to interface with up to 128 I/Os. This scalability is essential for complex systems that require numerous inputs and outputs.

The PCA9535CD,118 comes in a TSSOP24 package, providing a compact footprint that is beneficial for space-constrained applications. It is also specified over the -40°C to +85°C industrial temperature range, ensuring reliable operation in harsh environments.

In summary, the NXP PCA9535CD,118 is a highly adaptable, power-efficient I/O expander that significantly enhances the I/O capabilities of microcontroller-based systems, making it an excellent choice for designers looking to maximize functionality while minimizing space and power consumption.