If the VTARGET jumper is removed, the VTG must be supplied from an external source. Connect the external source to one of the VTG pins on any of the PORT headers. Always connect common ground (GND) when using an external VTG voltage.
When using an external source, the user must ensure that the VTG is higher than any of the AREF voltages.
The kit must always be powered when using an external VTARGET supply. If the VTG voltage is supplied from an external source while the main power switch is in the OFF position the kit may become damaged.