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A proper power supply circuit for SARA-N2 series modules must be able to withstand the current
values present during the data transmission at maximum power, even though NB-IoT systems should
be designed to keep the module in deep-sleep mode for most of the time, with an extremely low
current consumption in the range of few microamps.
Registration and
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25
context activation
data
0
20
0
150
100
50
0
0
5
10
15
Figure 3: Example of module current consumption from the switch-on event up to deep-sleep mode
1.5.2 Generic digital interfaces supply output (V_INT)
The same 1.8 V voltage domain used internally to supply the generic digital interfaces (GDI) of
SARA-N2 series modules is also available on the V_INT supply output pin, as described in
The internal regulator that generates the V_INT supply is a low drop out (LDO) converter that is
directly supplied from the VCC main supply input of the module.
The V_INT supply output provides internal short circuit protection to limit start-up current and
protect the load to short circuits.
The V_INT voltage regulator output is disabled (i.e. 0 V) when the module is switched off, while it can
be used to monitor the operating mode when the module is switched on:
When the radio is off, the voltage level is kept low (i.e. 0 V)
When the radio is on, the voltage level is maintained high (i.e. 1.8 V)
☞
Provide a test point connected to the V_INT pin for diagnostic purpose.
SARA-N2 series
Power
Management
VCC
51
VCC
52
LDO
VCC
53
V_INT
4
Figure 4: SARA-N2 series interfaces supply output (V_INT) simplified block diagram
UBX-17005143 - R06
RRC connection release
Cyclic paging reception
(signaling operations)
20
25
30
35
40
Baseband
Processor
Digital I/O
Interfaces
System description
SARA-N2 series - System Integration Manual
45
50
55
60
65
Deep Sleep
70
75
80
85
90
95
100
Time [s]
Figure
4.
Page 13 of 82
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