Zoe-M8B Vcc Current - u-blox EVK-M8BZOE User Manual

6.1.1 ZOE-M8B VCC current

To measure the acquisition and tracking power consumption with the EVK-M8BZOE, follow the below steps. A
picture of the setup can be seen in Figure 9.
1. Connect a voltmeter to J7 pin 1 and pin 2 to see the voltage over the 1 Ω current measurement shunt
resistor in the VCC supply.
2. Do a cold reset for the GNSS engine e.g. with u-center software.
3. Read the voltage (and average for a while if necessary) on the voltmeter and convert to current. 1 mV
equals 1 mA.
Average current consumption from power on to first fix will give you the Acquisition current
o
consumption as mentioned in the ZOE-M8B Data Sheet [1].
After the first fix, the receiver continues to operate in full-power mode. After some minutes when
o
it has acquired a sufficient number of satellites, it enters the Super-E power save mode. Average
current consumption in this state with a good signal level is less than 10 mA.
Figure 9: Setup to measure the VCC current consumption of ZOE-M8B on EVK-M8BZOE
See Figure 9 as an example where 0.0407 V in average is measured by multimeter over 1 Ω VCC shunt resistor.
This corresponds (1 mV equals 1 mA) to 40.7 mA average current typical in acquisition phase. In power-optimized
tracking state, the average current consumption can be of the order of 10 mA.
UBX-17053592 - R03 Early Production Information
EVK-M8BZOE User Guide
Measuring current consumption
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