Ublox TOBY-R2 Series, Руководство по системной интеграции

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TOBY-R2 series - System integration manual
UBX-16010572 - R10 System description Page 17 of 151
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 VCC supply circuit affects the RF compliance of the device integrating TOBY-R2 series
modules with applicable required certification schemes as well as antenna circuit design.
Compliance is met by fulfilling the requirements for the VCC supply summarized in
Table 6 .
Item Requirement Remark
VCC nominal voltage Within VCC normal operating range:
3.30 V min. / 4.40 V max
RF performance is guaranteed when VCC PA voltage is
inside the normal operating range limits.
RF performance may be affected when VCC PA 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. / 4.50 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
TOBY-R2 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.
Sections
1.5.1.2 , 1.5.1.3 and 1.5.1.4 describe current
consumption profiles in 2G, 3G and LTE connected-mode.
VCC peak current Support with margin the highest peak
VCC current consumption value in
connected-mode conditions specified in
TOBY-R2 data sheet
[1]
The specified maximum peak of current consumption
occurs during GSM single transmit slot in 850/900 MHz
connected-mode, in case of mismatched antenna.
Section
1.5.1.2 describes 2G Tx peak/pulse current.
VCC voltage drop
during 2G Tx slots Lower than 400 mV Supply voltage drop values greater than recommended
during 2G TDMA transmission slots directly affect the RF
compliance with applicable certification schemes.
Figure 5 describes supply voltage drop during 2G Tx slots.
VCC voltage ripple
during 2G/3G/LTE Tx Noise in the supply has to be minimized
High supply voltage ripple values during LTE/3G/2G RF
transmissions in connected-mode directly affect the RF
compliance with applicable certification schemes.
Figure 5 describes supply voltage ripple during RF Tx.
VCC under/over-shoot
at start/end of Tx slots Absent or at least minimized Supply voltage under-shoot or over-shoot at the start or
the end of 2G TDMA transmission slots directly affect the
RF compliance with applicable certification schemes.
Figure 5 describes supply voltage under/over-shoot
Table 6: Summary of VCC modules supply requirements