User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R18 Advance Information System description
Page 22 of 206
1.5.1.1 VCC supply requirements
Table 6 summarizes the requirements for the VCC module supply. See section 2.2.1 for all the suggestions to
properly design a VCC supply circuit compliant to the requirements listed in Table 6.
VCC supply circuit affects the RF compliance of the device integrating SARA-G3 and SARA-U2
series modules with applicable required certification schemes as well as antenna circuit design.
Compliance is guaranteed if the VCC requirements summarized in the Table 6 are fulfilled.
For the additional specific requirements for SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX and
SARA-U270 ATEX modules integration in potentially explosive atmospheres applications, see section 2.14.
Item Requirement Remark
VCC nominal voltage
Within VCC normal operating range:
3.35 V min. / 4.50 V max for SARA-G3 series
3.30 V min. / 4.40 V max for SARA-U2 series
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:
3.00 V min. / 4.50 V max for SARA-G3 series
3.10 V min. / 4.50 V max for SARA-U2 series
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.
VCC average current
Support with adequate margin the highest averaged
VCC current consumption value in connected-
mode
conditions specified in SARA-G3 series Data Sheet
[1]
and in SARA-U2 series Data Sheet [2].
The highest averaged VCC current consumption can be
greater than the specified value according to the actual
antenna mismatching, temperature and VCC voltage.
See 1.5.1.2, 1.5.1.3 for connected-mode current profiles.
VCC peak current
Support with margin the highest peak VCC current
consumption value specified in SARA-G3
series Data
Sheet [1] and in SARA-U2 series Data Sheet [2].
The specified highest peak of VCC current consumption
occurs during GSM single transmit slot
in 850/900 MHz
connected-mode, in case of mismatched antenna.
See 1.5.1.2 for 2G connected-mode current profiles.
VCC voltage drop
during 2G Tx slots
Lower than 400 mV
VCC voltage drop directly affects the RF compliance with
applicable certification schemes.
Figure 10 describes VCC voltage drop during Tx slots.
VCC voltage ripple
during 2G/3G Tx
Lower than 50 mVpp if f
ripple
≤ 200 kHz
Lower than 10 mVpp if 200 kHz < f
ripple
≤ 400 kHz
Lower than 2 mVpp if f
ripple
> 400 kHz
VCC voltage ripple directly affects the RF compliance with
applicable certification schemes.
Figure 10 describes VCC voltage ripple during Tx slots.
VCC under/over-shoot
at start/end of Tx slots
Absent or at least minimized
VCC under/over-shoot directly affects the RF compliance
with applicable certification schemes.
Figure 10 describes VCC voltage under/over-shoot.
Table 6: Summary of VCC supply requirements