EVK-M8GZOE User Guide
UBX-16030132 - R04
Measuring current consumption (ZOE-M8G only)
Page 18 of 30
Early Production Information
ZOE-M8G V_BCKP current
To measure the backup current consumption for
V_BCKP
of ZOE-M8G follow the below steps, a
picture of the setup can be seen at Figure 6:
1.
Connect a voltmeter to J6 pin 1 and pin 2 to see the voltage over the 100
Ω
current measurement
shunt resistor in the
V_BCKP
supply.
2.
Disconnect the main supply.
3.
Read the voltage on the voltmeter and convert to current. 1 mV equals 10 uA.
Figure 6: Setup to measure the V_BCKP current consumption of ZOE-M8G on EVK-M8GZOE
See Figure 6 for an example where 0.0016V is measured by multimeter over 100
Ω
V_BCKP shunt
resistor. This corresponds (1mV equals 10uA) to 16uA backup current.
ZOE-M8G optional Flash and logic current
If the firmware runs on the optional Flash (not the case by default), the current consumption of that
can be measured using J4. See schematic in section 8.
