Measurement With An External Current Measuring Power Supply - u-blox EVK-M8BZOE User Manual

EVK-M8BZOE User Guide

6.2 Measurement with an external current measuring power supply

If customers have their own current measurement setup, they can also measure the current consumption of VCC
and V_BCKP of ZOE-M8B with an external current measuring power supply.
Figure 11: Measuring power consumption with external power supply
In Figure 11 the VCC and V_BCKP power supply circuitry have been disconnected from the main power supply
and Gold Capacitor (J6 and J7 removed). The LDOs are supplied by separate external power supplies. The jumpers
for normal shunt resistor use have been disconnected and the power is supplied to the LDO connection pins. For
the jumpers J12, J13, and J11, the leftmost pin is connected to the main supply and the rightmost pin is connected
to the corresponding LDO. The J14 GND pins can be used to provide the ground for these external power supplies.
J6 pin 4 (red cable in Figure 11) directly supplies V_BCKP of ZOE-M8B. The voltage level must be within 1.4 V to
3.6 V.
The J7 pin 4 (orange cable in Figure 11) supplies the LDO which makes the 1.8 V for VCC of ZOE-M8B. The voltage
level must be within 2.5 V to 5.5 V.
UBX-17053592 - R03 Early Production Information Measuring current consumption
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