u-blox SARA-R4 Series System Integration Manual

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SARA-R4 series - System Integration ManualUBX-16029218 - R06 System descriptionPage 14 of 1021.4 Operating modesSARA-R4 series modules have several operating modes. The operating modes are defined in Table 4 anddescribed in detail in Table 5, providing general guidelines for operation.General Status Operating Mode DefinitionPower-down Not-Powered Mode VCC supply not present or below operating range: module is switched off.Power-Off Mode VCC supply within operating range and module is switched off.Normal Operation Deep-Sleep Mode RTC runs with 32 kHz reference internally generated.Active Mode Module processor core runs with 19.2 MHz reference generated by the internal oscillatorConnected Mode RF Tx/Rx data connection enabled and processor core runs with 19.2 MHz reference.Table 4: SARA-R4 series modules operating modes definitionMode Description Transition between operating modesNot-Powered Module is switched off.Application interfaces are not accessible.When VCC supply is removed, the modules enter not-powered mode.When in not-powered mode, the module can enter power-off modeapplying VCC supply (see 1.6.1).Power-Off Module is switched off: normal shutdown by anappropriate power-off event (see 1.6.2).Application interfaces are not accessible.The modules enter power-off mode from active mode when the hostprocessor implements a proper switch-off procedure, by sending theAT+CPWROFF command or by using the PWR_ON pin (see 1.6.2).When in power-off mode, the modules can be switched on by the hostprocessor using the PWR_ON input pin (see 1.6.1).When in power-off mode, the modules enter not-powered mode byremoving VCC supply.Deep-Sleep Only the internal 32 kHz reference is active.The RF section and the application interfaces aretemporarily disabled and switched off: themodule is temporarily not ready to communicatewith an external device by means of theapplication interfaces as configured to reducethe current consumption.The module enters the low power deep sleepmode (entering the Power Saving Mode definedin 3GPP Rel.13) whenever possible, if powersaving configuration is enabled by AT+CPSMScommand (see SARA-R4 series AT CommandsManual [2]), reducing current consumption (see1.13.9).Power saving configuration is not enabled bydefault; it can be enabled by AT+CPSMS (seethe SARA-R4 series AT Commands Manual [2]).The modules automatically switch from the active mode to low powerdeep sleep mode whenever possible, upon expiration of “ActiveTimer”, entering in the Power Saving Mode defined in 3GPP Rel.13, ifpower saving configuration is enabled (see 1.13.9 and the SARA-R4series AT Commands Manual [2], AT+CPSMS command).When in low power deep sleep mode, the module switches on to theactive mode upon expiration of “Periodic Update Timer” according tothe Power Saving Mode defined in 3GPP Rel.13 (see 1.13.9 and theSARA-R4 series AT Commands Manual [2], AT+CPSMS command), or itcan be switched on to the active mode by the host processor using thePWR_ON input pin (see section 1.6.1).Active Module is switched on with applicationinterfaces enabled or not suspended: themodule is ready to communicate with anexternal device by means of the applicationinterfaces unless power saving configuration isenabled by AT+CPSMS (see SARA-R4 series ATCommands Manual [2]).The modules enter active mode from power-off mode when the hostprocessor implements a proper switch-on procedure by using thePWR_ON pin (see 1.6.1).The modules enter active mode from low power deep sleep modeupon expiration of “Periodic Update Timer” (see 1.13.9), or when thehost processor implements a proper switch-on procedure by using thePWR_ON pin (see 1.6.1).The modules enter power-off mode from active mode when the hostprocessor implements a proper switch-off procedure (see 1.6.2).The modules automatically switch from active to low power deep sleepmode whenever possible, if power saving is enabled (see 1.13.9).The module switches from active to connected-mode when a RF Tx/Rxdata connection is initiated or when RF Tx/Rx activity is required due toa connection previously initiated.The module switches from connected to active mode when a RF Tx/Rxdata connection is terminated or suspended.