8
Positioning and Power Consumption Test
UC-08-C43 EN R1.0
4.2
Power Consumption Test
4.2.1
Power Consumption in Running Mode
To power the GNSS adapter, you can use an external voltage or the power from the
bottom board. See 4.2.1.1 and 4.2.1.2 for the procedures to test the power consumption
in the running mode with different power source.
4.2.1.1
Powered by Bottom Board
When the adapter is powered by the bottom board. Follow the procedures below to test
the power consumption in the running mode.
1.
Remove the VDDIO and DCDC_IN jumper caps before power on.
2.
Use two test wires, one end of which inserted to the VDDIO jumper, and the other
end connected to the multimeter (see Figure 4-2).
3.
Do step 2 again with another two wires and a multimeter but insert the wires to
DCDC_IN jumper.
4.
Turn the multimeters to current mode.
5.
Connect the EVK to the PC through the USB interface. Then the EVK is powered.
6.
Connect the signal source to the antenna SMA interface J4. Set the signal strength
to -130 dBm.
7.
Start the UPrecise and make sure that the positioning is successful.
8.
Read the current values of VDDIO
current
and DCDC_IN
current
.
9.
Compute the power consumption, which is equal to
3.3 V × (VDDIO
current
+ DCDC_IN
current
).
