u-blox SARA-R4 Series System Integration Manual

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SARA-R4 series - System Integration ManualUBX-16029218 - R06 System descriptionPage 18 of 1021.5.1.4 VCC current consumption in active mode (power saving disabled)The active mode is the state where the module is switched on and ready to communicate with an external deviceby means of the application interfaces (as the USB or the UART serial interface). The module processor core isactive, and the 19.2 MHz reference clock frequency is used.If power saving configuration is disabled, as it is by default (see SARA-R4 series AT Commands Manual [2],+CPSMS AT command for details), the module does not automatically enter the PSM low power deep sleepmode whenever possible: the module remains in active mode. Otherwise, if the power saving configuration isenabled, the module enters PSM low power deep sleep mode whenever possible (see section 1.13.9).Figure 4 illustrates a typical example of the module current consumption profile when the module is in activemode. In such case, the module is registered with the network and, while active-mode is maintained, thereceiver is periodically activated to monitor the paging channel for paging block reception.Detailed current consumption values can be found in SARA-R4 series Data Sheet [1].ACTIVE MODEPaging periodTime [s]Current [mA]Time [ms]Current [mA]RXEnabled01000100Figure 4: VCC current consumption profile with power saving disabled and module registered with the network: active-mode isalways held and the receiver is periodically activated to monitor the paging channel for paging block reception1.5.2 Generic digital interfaces supply output (V_INT)The V_INT output pin of the SARA-R4 series modules is generated by the module internal power managementcircuitry 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 series DataSheet [1]. The V_INT voltage domain can be used in place of an external discrete regulator as a referencevoltage rail for external components.