SARA-N2 / N3 series - System integration manual
UBX-17005143 - R13
System description
Page 15 of 95
C1-Public
1.5
Supply interfaces
1.5.1
Module supply input (VCC)
The modules must be supplied via all the three
VCC
pins that represent the module power supply
input.
The
VCC
pins are internally connected to the RF power amplifier and to the integrated Power
Management Unit: all supply voltages needed by the module are generated from the
VCC
supply by
integrated voltage regulators, including
V_INT
(digital interfaces supply) and
VSIM
(SIM card supply).
During operation, the current drawn by the SARA-N2 / N3 series modules through the
VCC
pins can
vary by several orders of magnitude. This ranges from the high peak of current consumption during
data transmission at maximum power level in connected mode, to the low current consumption during
deep-sleep mode (as described in section
1.5.1.1
VCC supply requirements
summarizes the requirements for the
VCC
module supply. See section
suggestions to properly design a
VCC
supply circuit compliant to the requirements listed in
⚠
VCC supply circuit design may affect the RF compliance of the device integrating SARA-N2 / N3
series modules with applicable required certification schemes. Compliance is not guaranteed if
the VCC requirements summarized in the
Item
Requirement
Remark
VCC
nominal voltage Within
VCC
normal operating range:
•
SARA-N2: 3.1 V min. / 4.0 V max
•
SARA-N3: 3.2 V min. / 4.2 V max
The module cannot be switched on if
VCC
voltage
value is below the normal operating range minimum
limit.
Ensure that the input voltage at
VCC
pins is above
the minimum limit of the normal operating range for
at least more than 3 s after the module switch-on.
VCC
voltage during
normal operation
Within
VCC
extended operating range:
•
SARA-N2: 2.75 V min. / 4.2 V max
•
SARA-N3: 2.6 V min. / 4.2 V max
The module may switch off when
VCC
voltage drops
below the extended operating range minimum limit.
Operation above extended operating range limit is
not recommended and may affect device reliability.
When operating below the normal operating range
minimum limit, the internal PA may not be able to
transmit at the network-required power level.
VCC
average current Support with margin the highest averaged
VCC
current consumption value in connected mode
specified in the SARA-N2 data sheet
or in the
SARA-N3 data sheet
The maximum average current consumption can be
greater than the specified value according to the
actual antenna mismatching, temperature and
supply voltage.
VCC
voltage ripple
Noise in the supply has to be minimized
High supply voltage ripple values during RF
transmissions in connected-mode directly affect the
RF compliance with applicable certification schemes.
Table 5: Summary of VCC supply requirements
☞
For the additional specific requirements applicable to the integration of the SARA-N211 and the
SARA-N310 modules in devices intended for use in potentially explosive atmospheres, see the
guidelines reported in section
