UC3L-EK

Overview

Figure 1. AT32UC3L-EK Power Supply Logical View


The AT32UC3L-EK can be powered from three different sources: the USB Mini-AB plug (5V input), an external power supply connected to the J2 header (DC 5V ± 10%), or a 1.2V NiMh battery (in the J3 socket on the bottom side of the board).

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

The power indicator LED, D4, labeled POWER, indicates if the 3.3V from the external regulator is present.

The pushbutton labeled SW2 is there to activate the use of the battery when one is installed in the J3 socket.

The AT32UC3L064 firmware may read the battery current voltage with an ADCIFB channel.

The "Power Off" signal from the AT32UC3L064 to the on-board power supply block can be used to lower the power consumption by software.

To customize the hardware configuration of this block, see Section Configurations and Test Points, for a description of the possible hardware configurations of the power supply block.

Figure 2. AT32UC3L-EK Top View Power Supply Location


Figure 3. AT32UC3L-EK Bottom View Power Supply Location