SWRU294
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6.12 Current Measurement Jumpers
SmartRF TrxEB has three current measurement jumpers, MCU_PWR, IO_PWR and RF_PWR,
as shown in Figure 16. By removing one of the jumpers, an ammeter can easily be connected to
the board and perform current consumption measurements on the different segments of the EB.
Similarly, a separate, regulated power supply for the EM can be connected. Table 11 shows an
overview of what onboard components are connected to which power segment.
Figure 16
– Current measurement jumpers
If the EM is powered by a different source than the rest of the board, the same voltage should be
used on the EM as on the EB. The digital signals between the EB and the EM are not isolated
from each other, and different voltage levels can cause excessive current consumption or
erroneous interaction between the EB and the EM.
Figure 17
– Current measurement setup
NOTE:
On SmartRF TrxEB revision 1.3.0, the “IO” and “RF” silk print is switched around. For
all revisions, IO and RF current should be measured on the jumpers indicated by the silk print
in Figure 16. See chapter 9 for details about EB revision 1.3.0.
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