UBX-21008123 - R02
Setting up the evaluation board
Page 14 of 42
C1-Public
Using an external power supply or power analyzer
To measure the power consumption of the ANNA modules, connect the instrument terminals to the
J22 pins, as shown in Figure 4.
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 ANNA
module is connected to an EVK peripheral. The leakage is typically in the order of one to several
hundred 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 any ANNA supply
voltages other than 3.3 V.
Figure 4: Different options when measuring current consumption of ANNA modules
J22
V
C
C_
IO
VC
C
1
GND
5
A
J22
V
C
C_
IO
VC
C
1
GND
5
A
6
4
R6
J22
V
C
C_
IO
VC
C
3
1
V
J22
V
C
C_
IO
VC
C
3
1
A
Amperemeter
Voltmeter
One channel
Two channels
GND
GND
Onboard
3.3 V supply
DC/DC
External supply
1.7 - 3.6 V
-.-- V
Содержание EVK-ANNA-B4
Страница 34: ...UBX 21008123 R02 Appendix Page 34 of 42 C1 Public Appendix A Schematics...
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Страница 39: ...UBX 21008123 R02 Appendix Page 39 of 42 C1 Public Figure 23 ANNA B4 assembly drawing bottom view...
