EVK-M8GZOE User Guide
UBX-16030132 - R04
Measuring current consumption (ZOE-M8G only)
Page 19 of 30
Early Production Information
5.2
Measurement with external current measuring power supply
For customers using their own current measurement setup, the current consumption of
VCC
and
V_BCKP
of ZOE-M8G can also be measured with an external current measuring power supply.
Figure 7: Measuring power consumption with external power supply
In Figure 7, 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 from 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 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 7) supplies directly
V_BCKP
of ZOE-M8G. The voltage level has to be
within 1.4 V to 3.6 V.
The J7 pin 4 (orange cable in Figure 7) supplies the LDO which makes the 1.8 V for
VCC
of ZOE-M8G.
The voltage level has to be within 2.5 V to 5.5 V.
