4.4 Power Sources

The SAM E54 Xplained Pro kit can be powered by several power sources, as listed in the table below.

Table 4-4. Power Sources for SAM E54 Xplained Pro
Power SourceVoltage RequirementsCurrent RequirementsConnector Marking
External Power5V ±2% (±100mV) for USB host operation. 4.3V to 5.5V if a USB host operation is not required.

In USB host applications a minimum of 1A is recommended to supply the kit and the USB device.

Maximum recommended current is 2A. 		PWR
Embedded debugger USB4.4V to 5.25V (according to USB spec.)500 mA (according to USB spec.)DEBUG USB
Target USB4.4V to 5.25V (according to USB spec.)500 mA (according to USB spec.)TARGET USB

The kit automatically detects which power sources are available and chooses which one to use according to the following priority:

  1. External power.
  2. Embedded Debugger USB.
  3. Target USB.
Info: External power is required when 500mA from a USB connector is not enough to power the board with possible extension boards. A connected USB device in a USB host application might easily exceed this limit.