EVK-NORA-W1 - User guide
UBX-22002764 - R01
Hardware description
Page 13 of 22
C1-Public
3.7
Current sensing headers
The evaluation board provides two current sensing headers:
•
J7 allows for power consumption measurement of the NORA-W10 module VDD supply.
•
J8 allows for power consumption measurement of the NORA-W10 module VDD-IO supply.
Each of the 2.54 mm pitch 3-pin header have two pins connected across a 1
Ω
current-sense resistor
and the third pin connected to
GND
. Module VDD supply and module VDD-IO supply is sourced via
these resistors. To measure current consumption, use a multimeter or other precision voltage
measurement device to measure voltage drop across pins 2 and 3. Current can also be measured
directly by opening
JRMOD
, or
JRIO
to remove the current-sense resistor from the circuit. Use an amp
meter in series with the two voltage pins.
⚠
Pin 1 of J7, J8 is connected to GND.
Any current sense resistor can be bypassed by soldering the respective jumper:
JMOD
, or
JIO
.
The default hardware configuration does not require any modification of the current sense headers
for the EVK-NORA-W10 to perform properly.
Figure 12: Current sensing header layout
