Atmel SAM C21 Xplained Pro User Manual

4. Hardware Users Guide
4.1. Power Distribution
SAM C21 Xplained Pro has two power sources as described in Power Sources on page 8. Figure 4-1
Power Supply Block Diagram on page 11 shows 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 ATSAMC21J18A, 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 ATSAMC21J18A, on-board peripherals, and connectors.
Caution: As the SAM C21 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
V
C
C
_P5
V
0
External 5V input
EDBG
SAMC21J18
Regulator 3.3V
Power Select
(Jumper)
EDBG USB
Auto mux
VCC_P3V3
Peripherals
VCC_TARGET VCC_MCU
Power Switch Jumper
O
N
/
O
F
F
Regulator 3.3V
Power source
Power switch
Power converter
Power consumer
V
CC_
E
D
B
G
Atmel SAM C21 Xplained Pro [USER GUIDE]
Atmel-42460C-SAM C21 Xplained Pro_User Guide-10/2015
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Atmel SAM C21 Xplained Pro Specifications

General

Brand	Atmel
Model	SAM C21 Xplained Pro
Category	Motherboard
Language	English