EVK-M8BZOE User Guide
UBX-17053592 - R03
Early Production Information
Measuring current consumption
Page 23 of 33
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.
