Integration Manual

SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 System description Page 17 of 119
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-R40 4M / SARA-R410 M / SARA-N410
Power
M anagement
Unit
M emory
Baseband
Processor
Transceiver
Power
Amplifier
53
VCC
52
VCC
51
VCC
SARA-R412M
Power
M anagement
Unit
M emory
Baseband
Processor
Transceiver
Power
Amplifier
Figure 3: Block diagram of SARA-R4/N4 series modules’ internal VCC supply routing