EVK-NINA-B4 - User guide
UBX-19054587 - R04
Setting up the evaluation board
Page 13 of 40
C1 - Public
Using an external power supply or power analyzer
Connect the terminals of the instrument to the EVK pins, as shown in Figure 5. An ampere meter can
also be added in series.
Since the external voltage of any connected instrument can never perfectly match the 3.3 V
generated by the EVK, some small current leakage is apparent whenever the signal from the NINA
module is connected to an EVK peripheral. The leakage is
typically in the order of 100’s of nano amps.
To reduce leakage current, use a second external power channel to supply the EVK peripherals. This
second channel must also be used to enable PC communication when using NINA supply voltages
other than 3.3 V.
Figure 5: Different options when
measuring the NINA module’s current consumption
J22
V
C
C
_IO
V
C
C
1
GND
5
A
J22
V
C
C
_IO
V
C
C
1
GND
5
A
6
4
R6
J22
V
C
C
_IO
V
C
C
3
1
V
J22
V
C
C
_IO
V
C
C
3
1
A
Ampere meter
Volt meter
One channel
Two channels
GND
GND
Onboard
3.3 V supply
DC/DC
External supply
1.7 - 3.6 V
-.-- V
