Atmel AVR XMEGA-A3BU, Примечание к применению

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Atmel AVR1923
8394B-AVR-02/12
3 General information
The Atmel AVR XMEGA-A3BU Xplained kit is intended to demonstrate the Atmel
AVR ATxmega256A3BU microcontroller.
Figure 3-1 shows the available feature on
the board.
Figure 3-1. Overview of the XMEGA A3BU Xplained kit.
3.1 Preprogrammed firmware
The ATxmega256A3BU on the XMEGA-A3BU Xplained is pre-programmed with a
boot loader and a default firmware. The detailed description of the software is
available in the XMEGA-A3BU Xplained Software User Guide
(
3.2 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 optional expansion boards this margin is recommended.
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 it is then possible to
connect expansion boards on top of the J3 header.
The 5V (USB supply voltage) is regulated down to 3.3V with an onboard LDO
regulator, which provides power to the entire board. Expansion top boards that
require 5V will get this from the header J3 pin 10.
3.3 Measuring the Atmel AVR XMEGA power consumption
As part of an evaluation of the ATxmega256A3BU, it can be of interest to measure its
power consumption. Because the XMEGA has a separate power plane
(VCC_MCU_P3V3) on this board it is possible to measure the current consumption