2
AVR32907
32137A-AVR-10/10
2 Getting started
2.1 Powering up the board
The Atmel AT32UC3C-EK offers four interfaces to power the board: from the USB
virtual COM port (USB VCP) interface, from the USB USER interface, or from an
external source connected to either the J1 or J2 header. If two power sources are
applied at the same time, the following priorities are used to select the current valid
power source:
1. USB VCP (J27)
2. USB USER (J21)
3. External power supply jack (header J1)
4. External power supply two-pin header (header J2)
This means that if the board is connected to a USB host, it has the highest priority
and will, therefore, serve as the current power supply. Other power supplies that are
connected to the board at the same time will be ignored.
The input range on the external power supply header is from 3.3V to 5V for J2 and
from 9V to 12V for J1.
To power the board from the USB VCP or from the USB USER connector, use the
Mini-B plug to std-A plug 1.5m USB 2.0 cable that is included in the kit, and connect it
between the host and the board USB VCP connector.
When the board is powered, the green LED (marked POWER) will light up and the
default board firmware will start to run.
More information about the different power inputs is available in the hardware user’s
guide.
