User's Manual

SARA-R4 series - System Integration Manual
UBX-16029218 - R03 System description
Page 14 of 94
1.5 Supply interfaces
1.5.1 Module supply input (VCC)
The modules must be supplied via the three VCC pins that represent the module power supply input.
During operation, the current drawn by the SARA-R4 series modules through the VCC pins can vary by several
orders of magnitude, depending on the operating mode and state (as described in sections 1.5.1.2, 1.5.1.3 and
1.5.1.4).
It is important that the supply source is able to support the average current consumption occurring during a LTE
transmission at maximum RF power level.
1.5.1.1 VCC supply requirements
Table 6 summarizes the requirements for the VCC modules supply. See section 2.2.1 for suggestions to properly
design a VCC supply circuit compliant with the requirements listed in Table 6.
The supply circuit affects the RF compliance of the device integrating SARA-R4 series modules
with applicable required certification schemes as well as antenna circuit design. Compliance is
guaranteed if the requirements summarized in the Table 6 are fulfilled.
Item
Requirement
Remark
VCC nominal voltage
Within VCC normal operating range:
3.20 V min. / 4.20 V max
RF performance is guaranteed when VCC voltage is inside
the normal operating range limits.
RF performance may be affected when VCC voltage is
outside the normal operating range limits, though the
module is still fully functional until the VCC voltage is
inside the extended operating range limits.
VCC voltage during
normal operation
Within VCC extended operating range:
3.00 V min. / 4.30 V max
VCC voltage must be above the extended operating range
minimum limit to switch-on the module.
The module may switch-off when the VCC voltage drops
below the extended operating range minimum limit.
Operation above VCC extended operating range is not
recommended and may affect device reliability.
VCC average current
Support with adequate margin the highest averaged
VCC current consumption value in connected-mode
conditions specified in SARA-R4 Data Sheet [1]
The maximum average current consumption can be
greater than the specified value according to the actual
antenna mismatching, temperature and supply voltage.
Section 1.5.1.2 describes current consumption profiles in
connected-mode.
VCC peak current
Support with adequate margin the highest peak VCC
current consumption value in Tx connected-mode
conditions specified in SARA-R4 Data Sheet [1]
The maximum peak Tx current consumption can be
greater than the specified value according to the actual
antenna mismatching, temperature and supply voltage.
Section 1.5.1.2 describes current consumption profiles in
connected-mode.
VCC voltage ripple
during LTE Tx
Noise in the supply pins has to be minimized
High supply voltage ripple values during RF transmissions
in connected-mode directly affect the RF compliance with
the applicable certification schemes.
Table 6: Summary of VCC modules supply requirements