The Opto 2 Click Board™ is an optical isolator used to provide optical galvanic isolation of sensitive lines. The used optoisolation elements require a very low input current to be driven, down to 1.3mA (min). The speed of the internal optocoupler elements of the Opto 2 Click Board™ allows it to work with the signals up to 20MHz.
The Opto 2 Click Board™ can be used to provide galvanic isolation of the MCU pins, allowing driving by external components, while protecting it from surges up to 5kV on the driver side.