Atmel Evaluation Board AT32UC3C-EK AT32UC3C-EK Data Sheet

 

32151A-AVR-09/10 

This section presents the hardware blocks of the Atmel AT32UC3C-EK hardware 
design. Each hardware block is described with: 

•  an overview of the hardware block, 
•  a location in the schematics document, 
• AT32UC3C-specific information (when relevant), 
•  all possible hardware configurations of the block and available test points. 
In each block description, the components reference and schematic can be found in 
The AT32UC3C-EK Schematics and Assembly bottom/ top view  

The power supply block of the AT32UC3C-EK is in charge of distributing power to all 
components of the board. 

Figure 4-1. AT32UC3C-EK Power Supply Logical View 

Auto-Switch

JACK

12V

to

5v

LED

(power)

usb user

usb vcp

5V to 3V

The AT32UC3C-EK can be powered from 4 different sources: 2x USB mini AB plug 
(5V input): labeled “USB USER” (J21) and “USB VCP” (J27) and 2x external power 
supply J1 jack connector or the J2 2-pins headers (DC 12V ±10%). 

The AT32UC3C-EK will automatically switch to the more accurate power source if it 
senses voltage on it (external power supply is defined as the more accurate power 
source, then VBUS from “USB VCP” and the less accurate power source is VBUS 
from “USB USER”). 

These inputs go through an external 3.3V switch mode regulator which delivers 
supplies to the rest of the board with a 3.3V voltage. 

The power indicator LED green D3, labeled “POWER”, indicates if the 3.3V from the 
external regulator is present.