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Expand Click is an accessory board in mikroBus form factor. It includes the MCP23S17 16-bit I/O expander, which features an SPI interface and clock speeds up to 10 MHz for higher throughput applications. Three HARDWARE ADDRESS SEL jumpers allow you to configure the board address and connect up to eight devices on the same bus. An interrupt-on-change feature is also supported, as well as optional weak pull-ups on each input. The board is set to use the 3.3V mikroBus power supply by default, however soldering the PWR SEL SMD jumper to the 5V position will allow it to be used with 5V mikroBus systems.
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