OLIMEX DuinoMite, User Manual

Page: 11 / 32

The LiPo battery with
3.7V 1400mA
capacity and JST connector for DuinoMite-Mega is available
from Olimex. At maximum frequency with a VGA monitor connected the consumption is
125mA
which
will allow the DuinoMite-Mega to run about
10 hours
on battery.
As the external power supply utilises a DC/DC converter and not a linear voltage regulator the
DuinoMite-Mega power consumption when running at maximum frequency and with a VGA monitor
and keyboard attached is
100mA
when the input power supply is
12VDC
. (at
30VDC
the current will
drop to
40mA
and will rise to
130mA
at
9VDC ).
3.1.2. DuinoMite-Mini
The DuinoMite-Mini power supply is made with a linear voltage regulator to save cost (an LM1117 is
used). The power source could be USB connector or POWER JACK. The source is selected with a 3-
way jumper. The board has a protection ZENER diode (6.8V) on the input to protect the board from
over-voltage spikes on the power supply.
Note
The external power supply applied to the POWER JACK must be
5V REGULATED
. Note that applying
non-regulated or voltage above
5V
could
DESTROY
the DuinoMite-Mini .
Our recommendation is to use USB to power this board or the cheap `under $2' power supply adapters
for iPods, iPads, e-readers etc. which are with specification 5V/1A and are available on eBay.
3.1.3. DuinoMite
The DuinoMite has same sophisticated power supply like DuinoMite-Mega and allows power supply
9-30VDC
.