ON Semiconductor PCA9535ECD 16-bit I/O Expander

The PCA9535ECD from ON Semiconductor is a robust 16-bit I/O (Input/Output) expander designed to provide additional GPIO (General Purpose Input/Output) interfaces to a host controller via the I2C-bus interface. This versatile IC is perfect for applications where I/O pins on a microcontroller are limited and more are needed for interfacing with switches, sensors, LEDs, displays, and other peripherals.

With its 16-bit I/O ports configured as inputs or outputs, the PCA9535ECD offers great flexibility to designers. Each I/O port can be independently accessed and has its own configuration, input, output, and polarity inversion registers. This enables easy and direct interface with a wide range of components without the need for complex wiring or additional hardware.

The device operates at a supply voltage ranging from 2.3V to 5.5V, making it suitable for both 3.3V and 5V systems. Its low stand-by current makes it ideal for power-sensitive applications. Additionally, the PCA9535ECD is equipped with an interrupt output which can be connected to the interrupt logic of the host controller. This feature ensures that the host is immediately notified of any input state change without the need to continuously poll the expander, thus saving valuable processor time and reducing power consumption.

ON Semiconductor's PCA9535ECD also supports up to eight different I2C addresses, allowing multiple devices to be connected to the same I2C bus. This capability is particularly useful in complex systems requiring a large number of I/Os. The device's built-in power-on reset function ensures that the I/Os are initialized to a known state upon power-up.

Engineered for easy implementation and minimal external components, this I/O expander comes in a compact SSOP-24 package, making it a space-saving solution for expanding I/O capabilities in a variety of applications such as servers, industrial control, home automation, and consumer electronics.

In summary, the PCA9535ECD from ON Semiconductor is a highly adaptable, power-efficient solution for expanding I/O capabilities, ensuring seamless integration into a wide array of electronic systems.