Atmel Xplained Evaluation Board AT32UC3L0-XPLD AT32UC3L0-XPLD Data Sheet

 

 

Atmel AVR32924: UC3-L0 XPLAINED Hardware User’s Guide [APPLICATION NOTE] 

32156C

−AVR−06/2013 

6

The kit is powered via the USB connector, which leaves two options to power it: Connect the kit either to a PC through a 
USB cable or to a 5V USB power supply (AC/DC adapter). 

The 5V is regulated down to 3.3V with an onboard LDO regulator, which provides power to the entire board. The 
AT32UC3L064 is powered by 3.3V, but if 1.8V operation is desired, some modifications to the board are needed. This 
includes replacing the regulator with one that delivers 1.8V output and rerouting the power to the device (see schematic 
for explanation). As some of the other ICs on the Atmel UC3-L0 Xplained require 3.3V to operate correctly, these 
devices have to be removed also. 

As part of an evaluation of the Atmel AT32UC3L064, 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 ampere meter, it is possible to determine the current 
consumption of the AT32UC3L064. To locate the power measurement header, refer to 

Do not power the board without having the jumper or an ampere meter mounted. Otherwise, the device may 
be damaged. 

The AT32UC3L064 can be programmed through the UART-to-USB gateway. This can be accomplished using the 
UART boot loader preprogrammed in the device. Press and hold the mechanical button switch while powering up the 
board to enter the boot loader, and use 32-bit AVR Studio

®

 to set up a programming connection to the device. 

Note: 

If the default board controller firmware is replaced, programming of the AT32UC3L064 may not be possible as the 

UART-to-USB functionality might be missing. 

Note: 

If any external programming tool is used on the AT32UC3L064, the boot loader might be erased, and it will not be 

possible to program the device through the UART-to-USB gateway. In this case the boot loader has to be restored 
with an external programming tool. 

The AT32UC3L064 UART is connected to a UART on the Atmel AT32UC3B1256. The AT32UC3B1256 UART is 
communicating at 57600 baud, using one start bit, eight data bits, one stop bit, and no parity. 

When the AT32UC3B1256 device is enumerated (connected to a PC), the data transmitted from the AT32UC3L064 is 
passed on to a (virtual) COM port. This means that it is possible to use a terminal program to receive the transmitted 
data on a PC. Similarly data transmitted from the PC COM port is passed on to the AT32UC3L064 UART through the 
gateway.