Actel IGLOO PLUS Starter Kit, User Manual, Page: 25 / 62

Battery
IGLOO PLUS Starter Kit User’s Guide 25
Battery
In addition to the power brick and USB, this board provides the option to power-up via battery. No battery casing is
provided on the board. Jumpers should be set correctly to select the option of either powering through a wall/USB or
through batteries hooked up externally. To provide a 3 V input source from battery, two AA Alkaline cells may be used.
A 2-pin jumper for VBAT and GND must be provided to the input of the main regulator to give the option of either
powering through a wall/USB or powering through batteries hooked up externally.
Figure 3-2 · Battery Header and Power Input Schematics
Potentiometer and Voltage-Sweep
A potentiometer is located on the left hand side of the board to provide the voltage-sweep function to sweep V
CC
( Figure 3-3 ). One primary function of the potentiometer is to show battery operation on the IGLOO PLUS device and
how the FPGA can operate successfully even if V
CC
experiences a drop in voltage. You can measure the lowest possible
V
CC
for battery operations. When using the potentiometer, you should also monitor the V
CC
via current measurement
headers ( Figure 3-4 on page 26 ) to make sure it does not go beyond the specified value.
Figure 3-3 · Current Measurement Headers
BAT
EXTERNAL
BATTERY
SOURCE
1
2
J7
BATTERY
1x2_100MIL
J7
BATTERY
1x2_100MIL
V CC I_0
V CC I_1
V CC I_2
V CC I_3
V
CC
V
J TA G
V
PUMP
3.3 V
C urrent
Measurement
I G LOO PLU S
2.5 V
V
CC I
- S weep
V
CC I
- S weep
V
CC I
- S weep
3.3 V
3.3 V
1.5 V
3.3 V
3.3 V
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