Atmel MCU Evaluation Kit AT32UC3L-EK AT32UC3L-EK Data Sheet

 

32149A-AVR-07/10 

The Atmel AT32UC3L-EK offers three interfaces to power the board; from the USB 
VCP interface, from a battery (J3 connector on the bottom side of the board) or from 
an external source connected to the J2 header. If more than one power source are 
applied at the same time, the following priorities are used to select the current valid 
power source: 

1. USB VCP 
2.  External power supply (header J2) 
3. Battery (connector J3) 
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. 

To power the board from the USB VCP connector, use the “Mini-B plug to std-A plug 
1.5m USB2.0” cable that is included in the kit and connect it between the host and the 
board USB VCP connector. 

To power the board from the battery (included in the kit): 

•  insert the battery in the J3 connector (on the bottom side), making sure the side of 

the battery with the + sign sticker is in contact with the + sign of the J3 connector 
(see Figure 2-2), 

•  press the SW2 switch to activate the use of the battery. 
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.