SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 System description Page 21 of 157
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.
Voltage must be stable, because during operation, the current drawn by the SARA-R4/N4 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, 1.5.1.4 and 1.5.1.6).
It is important that the supply source is able to withstand both the maximum pulse current occurring during
a transmit burst at maximum power level and the average current consumption occurring during Tx / Rx
call at maximum RF power level (see the SARA-R4 Data Sheet [1]).
SARA-R412M modules provide separate supply inputs over the three VCC pins:
VCC pins #52 and #53 represent the supply input for the internal RF power amplifier, demanding most
of the total current drawn of the module when RF transmission is enabled during a call
VCC pin #51 represents the supply input for the internal baseband Power Management Unit, demanding
minor part of the total current drawn of the module when RF transmission is enabled during a call
The 3 VCC pins of SARA-R404M, SARA-R410M, SARA-N410 modules are internally connected each other
to both the internal RF Power Amplifier and the internal baseband Power Management Unit.
Figure 3 provides a simplified block diagram of SARA-R4/N4 series modules’ internal VCC supply routing.
53
VCC
52
VCC
51
VCC
SARA-R404M / SARA-R410M / SARA-N410
Power
Management
Unit
Memory
Baseband
Processor
Transceiver
Power
Amplifier
53
VCC
52
VCC
51
VCC
SARA-R412M
Power
Management
Unit
Memory
Baseband
Processor
Transceiver
Power
Amplifier
Figure 3: Block diagram of SARA-R4/N4 series modules’ internal VCC supply routing
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