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In order to establish a SPI connection between the iC880A-SPI and the host system, the following pins have to be used as minimum wiring set:
The power pins (21, 22) have to be connected to a power source that is able to provide more than 700 mA.
Therefore it is recommended to choose a proper power supply that is able to supply the iC880A-SPI and the host system (e.g. Raspberry PI) at the same time.
It is recommended to connect the necessary signals using wires that are as short possible in order to prevent communication disorders.