SARA-R4 series - System Integration Manual
UBX-16029218 - R06
System description
Page 16 of 102
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
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
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
