Atmel AVR32918: UC3-A3 Xplained Hardware User’s Guide [APPLICATION NOTE]
32159C
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AVR
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07/2012
4
Figure 2-2. Functional overview of the Atmel UC3-A3 Xplained kit.
2.1
Preprogrammed firmware
The Atmel AT32UC3A3256 on the Atmel UC3-A3 Xplained kit is preprogrammed with a USB bootloader and a default
firmware. The preprogrammed firmware in the AT32UC3A3256 is a simple demonstration of the QTouch button and
QTouch slider.
2.2
Power supply
The kit needs an external power supply that can deliver 5V and up to 500mA. The actual current requirement for the
board is much less than 500mA but in order to be able to power possible expansion boards this margin is needed.
The power can be applied to the board either via the USB connector or on pin 10 on the header J3. The USB connector
is the preferred input because then it is possible to connect expansion boards on top of the J3 header.
The 5V is regulated down to 3.3V with an on board LDO regulator, which provides power to the entire board. Expansion
top boards that require 5V will get this from the header J3 pin 10.
2.3
Measuring the AT32UC3A3256 power consumption
As part of an evaluation of the AT32UC3A3256, it can be of interest to measure its power consumption. The two-pin
header with a jumper mounted on it is the only connection between the common power plane VCC_P3V3 and the
VCC_MCU_P3V3 power plane. By replacing the jumper with an amperemeter it is possible to determine the current
consumption of the Atmel AT32UC3A3256. To locate the power measurement header, please refer to
Warning:
Do not power the board without having the jumper or an amperemeter mounted. Otherwise, the device may be
damaged.
