Microchip Technology's MCP23017-E/SP I/O Expander

The MCP23017-E/SP from Microchip Technology is a versatile 16-bit I/O expander with an SPI interface that provides an easy way to expand the available I/O on a microcontroller or microprocessor. This integrated circuit is perfect for applications where additional I/Os are necessary or where PCB space is at a premium, such as in automotive environments, industrial controls, and consumer electronics.

This robust component operates over a wide voltage range (2.7V to 5.5V), making it suitable for interfacing with both 3.3V and 5V systems. Its 16 individual I/O pins can be configured as either inputs or outputs, allowing for a flexible adaptation to specific needs. The MCP23017-E/SP features high drive outputs with 25 mA sink/source capability, which is ideal for directly driving LEDs or other low-power devices.

One of the key features of the MCP23017-E/SP is its built-in interrupt output which can be connected to the interrupt input of a microcontroller. This feature significantly reduces the microcontroller's workload by indicating when an input state has changed, thus avoiding the need for the microcontroller to continuously poll the I/O expander.

Furthermore, the device includes an internal weak pull-up resistor for each I/O pin, which can be configured through software, and a hardware address pin that allows multiple devices to share the same SPI bus, up to eight devices, offering the possibility to extend the I/O capability up to 128 additional pins.

For ease of use, the MCP23017-E/SP is available in a 28-pin SPDIP package, making it straightforward to integrate into a variety of design layouts. Its operational temperature range from -40°C to +125°C ensures reliability and performance in extreme conditions.

Overall, the MCP23017-E/SP is a powerful solution for system designers looking to increase the I/O capabilities of their projects without increasing the complexity or the cost significantly. Its mix of features and ease of integration make it an excellent choice for expanding the functionality of a wide range of electronic systems.