5.2.5 VBAT Backup Select

There is a 1x3, 100mil pin-header on the kit that can be used to select a power source for the VBAT pin (PB03) marked "VBAT Select". The power source can either be the onboard 3.3V that supplies the other peripherals on the board, or the onboard super capacitor. To select the source for the VBAT pin, move the jumper to the desired voltage by placing the jumper between pin 1-2 for the super capacitor, or between pin 2-3 for the targets MCU voltage. If power to the VBAT pin is not needed, the jumper can be removed and PB03 at the center pin can be used as a GPIO.