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Expand Click

Expand Click

MPN: MIKROE-951
MikroElektronika
MCP23S17 GPIO Interface mikroBUS™ Click™ Platform Evaluation Expansion Board
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Overview

The Expand Click is a mikroBUS add-on board designed to provide additional GPIO pins via the Microchip MCP23S17 I/O expander. It offers 16 bits of general-purpose parallel I/O, allowing engineers to increase the pin count of a resource-constrained microcontroller using only a single SPI interface.

Why Choose This Part

The board features a high-speed SPI interface and includes configurable internal weak pull-up resistors for all pins, reducing the need for external components. It supports interrupt-on-change functionality, which allows the host microcontroller to remain in sleep mode until a logic change occurs on one of the 16 GPIO pins.

Applications

User Interface Expansion
Driving up to 16 LEDs or monitoring a matrix of tactile switches without consuming a high number of native MCU pins.
Legacy Peripheral Control
Interfacing with older parallel-bus hardware that requires many control lines for addressing and data.
System Logic Monitoring
Using the interrupt-on-change feature to monitor multiple digital alarm lines or logic state transitions in real-time.

Key Specifications

Type Interface
Contents Board(s)
Function GPIO
Platform mikroBUS Click
Utilized IC / Part MCP23S17

Getting Started

Plug the board into any mikroBUS compatible socket and initialize the SPI bus at 3.3V or 5V logic levels. Use the provided MikroElektronika libraries for mikroC, mikroBasic, or mikroPascal to quickly configure port directions and interrupt registers.

Also Consider

Expand 2 Click MikroElektronika - An I2C-based alternative using the MCP23017 for systems where SPI pins are already fully allocated.
MCP23S17-E/SP MCHPMicrochip Technology - The raw 28-DIP IC for migrating from the evaluation board to a custom breadboard or PCB design.