TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R07
Advance Information
System description
Page 21 of 158
1.5
Supply interfaces
1.5.1
Module supply input (VCC or 3.3Vaux)
TOBY-L2 modules are supplied via the three
VCC
pins, and MPCI-L2 modules are supplied via the five
3.3Vaux
pins. All supply voltages used inside the modules are generated from the
VCC
or the
3.3Vaux
supply input by
integrated voltage regulators, including the
V_BCKP
RTC supply, the
V_INT
generic digital interface supply, and
the
VSIM
or
UIM_PWR
SIM interface supply.
The current drawn by the TOBY-L2 and MPCI-L2 series modules through the
VCC
or
3.3Vaux
pins can vary by
several orders of magnitude depending on radio access technology, operation mode and state. It is important
that the supply source is able to support both the high peak of current consumption during 2G transmission at
maximum RF power level (as described in the section 1.5.1.2) and the high average current consumption during
3G and LTE transmission at maximum RF power level (as described in the sections 1.5.1.3 and 1.5.1.4).
1.5.1.1
VCC or 3.3Vaux supply requirements
Table 7 summarizes the requirements for the
VCC
or
3.3Vaux
modules supply. See section 2.2.1 for suggestions
to properly design a
VCC
or
3.3Vaux
supply circuit compliant with the requirements listed in Table 7.
The supply circuit affects the RF compliance of the device integrating TOBY-L2 and MPCI-L2
series modules with applicable required certification schemes as well as antenna circuit design.
Compliance is guaranteed if the requirements summarized in the Table 7 are fulfilled.
Item
Requirement
Remark
VCC
or
3.3Vaux
nominal voltage
Within
VCC
or
3.3Vaux
normal operating range:
See “Supply/Power pins” section in the
TOBY-L2 Data
Sheet
[1] or in the
MPCI-L2 Data Sheet
The modules cannot be switched on if the supply voltage
is below the normal operating range minimum limit.
VCC
or
3.3Vaux
voltage during
normal operation
Within
VCC
or
3.3Vaux
extended operating range:
See “Supply/Power pins” section in the
TOBY-L2 Data
Sheet
[1] or in the
MPCI-L2 Data Sheet
The modules may switch off if the supply voltage drops
below the extended operating range minimum limit.
VCC
or
3.3Vaux
average current
Support with adequate margin the highest averaged
current consumption value in connected-mode
conditions specified for
VCC
in
TOBY-L2 Data Sheet
or specified for
3.3Vaux
in
MPCI-L2 Data Sheet
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
or
3.3Vaux
peak current
Support with margin the highest peak current
consumption value in 2G connected-mode conditions
specified for
VCC
in
TOBY-L2 Data Sheet
specified for
3.3Vaux
in
MPCI-L2 Data Sheet
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
or
3.3Vaux
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
or
3.3Vaux
voltage ripple during
RF transmission
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
or
3.3Vaux
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 7: Summary of VCC or 3.3Vaux modules supply requirements
