EVK-L4 - User Guide
UBX-17013792 - R01
Appendix
Page 21 of 23
D
Current consumption measurement
The current consumption of TOBY-L4 series modules can be measured on the EVK-L4 by removing the jumper
socket from the
Cellular VCC supply jumper
(J404 on the EVB), described in Figure 10.
Cellular VCC supply jumper socket (J404)
to be removed for
TOBY-L4 module
current consumption measurements
Figure 10: Jumper socket to be removed for TOBY-L4 series modules current consumption measurement
A suitable external digital multi-meter (as for example, the Agilent 34410A or 34411A) can be used for current
consumption measurements: in this case, the 3.8 V supply circuit on the EVB will supply the TOBY-L4 module
mounted on the adapter board, with the digital multi-meter placed in series as described in Figure 11.
TOBY-L4
adapter board
TOBY-L4
Cellular
module
42
-p
in
D
IL
B
2B
con
n
ect
o
rs
EVB-WL3
Step - Down
Main power switch
(SW400)
12 V
(J400)
3.8 V
VCC jumper
(J404)
VCC
Digital Multimeter
DCI
+ –
Figure 11: Block diagram of current consumption setup for TOBY-L4 series modules
Alternatively, a suitable external DC power supply with dynamic current measurement capabilities (as for
example, the Agilent 66319B/D) can be used for current consumption measurements, acting also as the 3.8 V
supply source for the TOBY-L4 module mounted on the adapter board.
