4.1.3 Current Measurement Header

An angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge of the SAM R21 Xplained Pro. All power to the ATSAMR21G18A is routed through this header. To measure the power consumption of the device remove the jumper and replace it with an ammeter.

CAUTION: Removing the jumper from the pin-header while the kit is powered may cause the ATSAMR21G18A to be powered through its I/O pins. This may cause permanent damage to the device.