Ublox SARA-G300, System Integration Manual

Page: 25 / 217

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 System description
Page 25 of 217
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 Table 6 are fulfilled.
For the additional specific requirements for SARA-G340 ATEX, SARA-G350 ATEX, SARA-U201 ATEX and
SARA-U270 ATEX modules integrated in potentially explosive atmospheres, 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 the 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 seconds 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 the
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 the SARA-G3 series Data
Sheet [1] and in the 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 the SARA-G3 series
Data Sheet [1] and in the 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 the event of a 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