4.
Hardware Users Guide
4.1
Power Distribution
SAMC21N Xplained Pro has two power sources.
illustrates a block diagram of the power
supply circuitry. The kit can be powered from the EDBG USB and an external 5.0V source. The kit will
automatically select which source to draw power from.
The EDBG controls an on-board power switch to the ATSAMC21N18A, the on-board peripherals, and
extension connectors. When the kit is powered up, the EDBG reads the ID chip information from all
connected Xplained Pro extension boards and checks that they are compatible with the voltage selected
by the power selection jumper. If the selected voltage is within the connected extensions ranges the
switch will open. If not, the EDBG power LED will blink rapidly and the switch will stay closed resulting in
no power provided to the ATSAMC21N18A, on-board peripherals, and connectors.
Caution:
As the SAMC21N Xplained Pro can be powered by 5.0V care must be taken not to
connect any Xplained Pro extensions that does not support this voltage, doing so may result in
permanent damage. Check the respective extension kit's user guide to see which voltages are
acceptable.
Info:
The EDBG only reads the ID information and controls the power switch when the kit is
powered up. This mechanism does not check hot-plugging of extension boards.
Figure 4-1. Power Supply Block Diagram
4.2
Connectors
The following sections describes the implementation of the relevant connectors and headers on
SAMC21N Xplained Pro and their connection to the ATSAMC21N18A. The tables of connections in the
sections also describes which signals are shared between the headers and on-board functionality.
shows all available connectors and jumpers on SAMC21N Xplained Pro.
SAMC21N Xplained Pro
©
2017 Microchip Technology Inc.
User Guide
DS70005318A-page 12
