The information in this document is subject to change without notice
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Rev 1.0 Dec 2020
5.3.
Current Measurements
The AVT9152 evaluation kit power consumption can be measured at the J18 connector by inserting a
multimeter between J18:1-2 or J18:2-3 depending on whether the system power supply source is from the
ex3.6V battery or the ex5V DC power adaptor, respectively.
The system power is then delivered to the AVT9152 module and various sensor devices on board such as
3-axis linear accelerometer (LIS2DH12), 3-axis gyroscope (I3G4250D), absolute pressure sensor or
barometer (LPS22HB), AmbiMate sensor module (2314277-1), antenna RF switch (F2977) and also the
3.3V and 5V power rails on the Arduino Uno interface.
The power consumption of each of these sensor devices and also RF switch can be individually measured
at their respective power supply rail jumper connector with a multimeter listed in the table below. The power
consumption of the AVT9152 module can then be derived from the difference between the measured total
evaluation kit power consumption and all the individual sensor device’s and RF switch’s current
consumption combined when no Arduino daughter board or shield is installed. Please note that jumper
J19:1-2 is OFF if the Arduino daughter board or shield is not installed or the system power source is supplied
from the ex5V DC power adaptor.
Sensor Devices and RF Switch Power
Rail Jumper Setting
Sensor Device and RF Switch Power Supply or
Power Consumption Measurement
J2:1-2 ON
LIS2DH12 accelerometer is powered or connects
multimeter between J2:1-2 for power measurement.
J2:3-4 ON
I3G4250D gyroscope is powered or connects
multimeter between J2:3-4 for power measurement.
J2:5-6 ON
LPS22HB barometer is powered or connects
multimeter between J2:5-6 for power measurement.
J2:7-8 ON
Ambimate sensor module is powered or connects
multimeter between J2:7-8 for power measurement.
J22:1-2 ON
F2977 RF switch is powered or connects multimeter
between J22:1-2 for power measurement.
Table 5: Sensor Devices and RF Switch Power Rail Jumper
5.4.
Clock Source
The AVT9152 module embeds its own external 32 MHz and 32.768 kHz crystals on the nRF52840 BT5.0
device providing all the potential options for its clock source. Whereas the nRF9160 device has all its
necessary clock source embedded in the device itself.
