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SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R13 System description Page 22 of 119
1.5.1.6 VCC current consumption in active mode (PSM / low power disabled)
The active mode is the state where the module is switched on and ready to communicate with an external device by
means of the application interfaces (as the USB or the UART serial interface). The module processor core is active, and
the 19.2 MHz reference clock frequency is used.
If power saving mode and/or low power mode configurations are disabled, as it is by default (see the SARA-R4/N4 series
AT Commands Manual [2], +CPSMS, +UPSV AT commands for details), the module remains in active mode. Otherwise, if
PSM mode and/or low power mode configurations are enabled, the module enters PSM mode and/or low power mode
whenever possible.
Figure 8 illustrates a typical example of the module current consumption profile when the module is in active mode. In
such case, the module is registered with the network and, while active mode is maintained, the receiver is periodically
activated to monitor the paging channel for paging block reception.
Detailed current consumption values can be found in the SARA-R4/N4 series Data Sheet [1].
ACTIVE MODE
Paging period
Time [s]
Current [mA]
Time [ms]
Current [mA]
RX
Enabled
0
100
0
100
Figure 8: VCC current consumption profile with power saving disabled and module registered with the network: active mode is always held and the
receiver is periodically activated to monitor the paging channel for paging block reception
1.5.2 Generic digital interfaces supply output (V_INT)
The V_INT output pin of the SARA-R4/N4 series modules is generated by the module internal power management
circuitry when the module is switched on and it is not in the deep sleep power saving mode.
The typical operating voltage is 1.8 V, whereas the current capability is specified in the SARA-R4/N4 series Data Sheet [1].
The V_INT voltage domain can be used in place of an external discrete regulator as a reference voltage rail for external
components.