This driver uses SPI to initialise and enable switches. It sets the over-current thresholds to
minimal value. It activates the logical AND mode for the output, so both SPI_INx field in OCR
register and direct control input pin INx has to be set high to close the switch. The SPI_INx field
is therefore used for enabling a switch.
The FS pin can be used to trigger interrupts on falling edges via External Interrupt registers in
SIUL. This will allow getting an instant fault-treatment (not implemented in the example). In this
example the fault status is displayed only when the user asks for it.
CSNS can be used to get the output current value at one of the high side switches. (not
implemented in the example).
FSI is grounded to avoid refreshing the watchdog.
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