R
Measuring Power Across Voltage Supply Jumpers
Measuring Power Across Voltage Supply Jumpers
All regulator output supplies have an associated series jumper, as indicated in Table 17-1
and shown in Figure 17-1 . This allows for simple and easy current monitoring using just a
multimeter.
For example, to measure the Suspend mode current on the FPGA’s V CCAUX or V CCINT
supplies, follow these steps.
Caution! The Suspend feature must first be enabled in the actual FPGA application. All the
example designs initially shipped with the board have the Suspend feature enabled.
?
?
Disconnect power to the board.
Remove the series jumper associated with the supply to be measured, shown in
Table 17-2 . Locate jumper indicated in Figure 17-1 .
Table 17-2:
FPGA Supply Rails and Associated Voltage Supply Jumper
Associated Voltage
FPGA Supply Rail
V CCINT
V CCAUX
Supply Jumper
J9
J11
Default Voltage
1.2V
3.3V
?
Connect a digital multimeter across the jumper, as highlighted in Figure 17-2 . If the
resulting current is negative, simply reverse the connections to the jumpers.
Measured Current
(mA)
Set Current Range
(200 mA DC)
VCCINT (1.2V)
(Jumper J9)
VCCAUX (3.3V)
(Jumper J11)
UG330_c17_02_032207
Figure 17-2:
Measuring Current (Power) Using a Multimeter
?
Set the meter to measure DC Amperes. Initially set the meter to the Ampere range. If
appropriate, switch to a lower range (for example, 200 mA) after initially measuring
current in the Ampere range.
Spartan-3A/3AN FPGA Starter Kit Board User Guide www.xilinx.com
UG334 (v1.1) June 19, 2008
137
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