SPI Isolator 6 Click is a compact add-on board representing a digital isolator optimized for a serial peripheral interface. This board features the MAX22345, a fast, low-power 4-channel digital galvanic isolator from Analog Devices. This device comes with a maximum data rate of 200Mbps and transfers digital signals between circuits with different power domains featuring reinforced isolation for a withstand voltage rating of 3.75kVRMS for 60 seconds. This Click board™ is suitable for general SPI-bus isolation, industrial, process and building automation, programmable logic controllers, and many more.
SPI Isolator 6 Click as its foundation uses the MAX22345, a four-channel digital isolator with a maximum data rate of 200Mbps from Analog Devices. The MAX22345 provides galvanic isolation for digital signals transmitted between two ground domains and can withstand up to 784Vpeak of continuous isolation and up to 3.75kVRMS for up to 60 seconds. Besides, it also offers low-power operation, high electromagnetic interference (EMI) immunity, and stable temperature performance through Analog's proprietary process technology. Both power pins' wide supply voltage range allows the MAX22345 to be used for level translation and isolation.
Because this Click board™ represents an isolator for SPI communication, it logically communicates with the MCU precisely through that communication. As already mentioned, the MAX22345 has two power pins for the A and B isolation sides, where it is possible to supply its B side with external voltage in the range of 1.7 to 5.5V by applying it to the terminal marked with VCC_EXT. In addition to the external power supply terminal, this Click board ™ also possesses another two terminals to which the isolated SPI data communication lines are routed.
This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
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