Datasheet

Page 8 Page 9
1. Power supply
Figure 1-1:
AC/DC adapter power
supply connected
Figure 1-3:
USB connected
Figure 1-2:
laboratory power supply
connected to screw terminals
VCC
VCC
D6
MBRS140T3
L1
220uH
VCC-EXT
D2
1N4007
D4
1N4007
D3
1N4007
D5
1N4007
VCC
7-23V AC
9-32V DC
POWP
POWN
E5
330uF/6V
E4
330uF/35V
R10
0.22
R2
2K2
R7
3K
R8
1K
C9
220pF
LD1A
CN8
CN7
1
2
3
4
8
7
6
5
SWC
SWE
CT
GND
DRVC
IPK
VIN
CMPR
U4
MC34063A
POWER
Figure 1-4:
Schematics of external power supply
Ready for AVR board can be powered in two ways: over USB
connection, or using external power sources, such as adapters,
or laboratory power supplys. USB connection can provide up to
500mA of current, which is more than enough for evey on-board
module and for operation of the microcontroller. If you decide
to use external power supply, you can choose bewteen AC/DC
adapter connector or power screw terminals . Voltage and current
values must be within 7-23V AC or 9-32V DC ranges. Power LED
will indicate the presence of current. Use only one method for
powering the board.