IGLOO2 FPGA Evaluation Kit User Guide
13
3 – Key Components Description and
Operation
This chapter describes the key component interfaces. For device datasheets, refer to:
http://www.microsemi.com/document-portal/doc_download/132042-igloo2-fpga-datasheet
.
Powering Up the Board
The board can be powered through either of two 12 V sources that are, external +12 V/2 A DC jack or PCIe
connector as shown in
Figure 4.
Protection mechanism enables the external DC jack supply, if both the sources are
available, simultaneously.
When both the power sources are ON, board takes the power from external DC jack as Diode D3 becomes reverse
biased and path will be open for 12P0_PCIE. When the external DC voltage is not present, the board can be powered
up using the PCIe connector.
12P0V_IN
12P0V
PCIe
CON1
+12 V
DC
Jack
ENABLE_FT4232
2
5
1
3
4
6
SW7
J3
J6
Figure 4.
Powering Up the Board
Current Measurement
1.2 V Current Sensing for Normal Operation
For applications which require current measurement high precision Operational Amplifier circuitry (U31 with gain 100)
is placed on the board to measure the output voltage at TP14 test point with reference to the ground.
Core power can be measured by following these steps:
1. Measure the output voltage (VOUT) at TP14.
2. I = (VOUT/5)
3. Core Power consumed P= (1.2 V)*I
For example, when the voltage measured across TP14 as 0.5 V, then the consumed core power is 0.12 W.