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3.4.2
Xplained Pro Power Header
The power header can be used to connect external power to the SAMDA1 Xplained Pro kit. The kit will
automatically detect and switch to the external power if supplied. The power header can also be used as a power
supply for external peripherals or extension boards. Care must be taken not to exceed the total current limitation
of the on-board regulator for the 3.3V regulated output (85mA). To locate the current measurement header, refer to
Figure 1-1, "SAMDA1 Xplained Pro Evaluation Kit Overview" on page 4
Pin number
Name
1
VEXT_P5V0
2
GND
3
VCC_P5V0
4
VCC_P3V3_CON
If the board is powered from a battery source it is recommended to use the PWR header. If there is a power source
Warning:
connected to EDBG USB, the EDBG is activated and it will consume more power.
Power Header PWR
Table 3-6.
Description
External 5V input
Ground
Unregulated 5V (output derived from one of the input sources: (1) Ext. 5V
input, (2) USB Target, (3) USB EDBG
Regulated 3.3V (output – used as main power for the kit)
Atmel SAMDA1 Xplained Pro [USERGUIDE]
10
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