CC26x0/CC13x0 SimpleLink Wireless MCU Power ... - …

1 CC26x0,CC13x0 SimpleLink WirelessMCUP owerManagementSoftwareDevelopmentReferen ceGuideLiteratureNumber:SWRA486 AAugust2015 RevisedApril20172 SWRA486A August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedTableof ExternalInputInterruptsand August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedList of FiguresList of Figures1 Idle ,Part ,Part ,Part Sequence,Part Sequence,Part ()Functionin Enablingthe DC-DCConverterDuringActiveand VoltageThresholdFor TurningOff the DriverlibFunctionThatEnablesand Disablesthe DC-DCConverterat the Configurationin DisablingLF ExternalLF the of August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedPreface PrefaceSWRA486A August2015 RevisedApril2017CC26x0,CC13x0 SimpleLink WirelessMCUP owerManagementSoftwareDevelopmentThe CC26x0and CC13x0familyof devicesare part of the SimpleLink microcontroller(MCU)

2 Platform,whichconsistsof Wi-Fi , Bluetooth low energy,Sub-1 GHz,and host sharea common,easy-to-usedevelopmentenvironment with a singlecoresoftwaredevelopmentkit (SDK)and rich tool set. Aone-timeintegrationof the SimpleLinkplatformlets you add any combinationof devicesfromthe portfoliointo ultimategoal of the SimpleLinkplatformis to achieve100 moreinformation,visit the CC26x0and CC13x0 SimpleLinkultra-low-powerwirelessMCUplat formsisimplementedas part of the overviewof this implementationandwhatto considerwhenportingthis implementationto partsspecificto the CC26x0and CC13x0familyof devices,but doesnotcoverthe guidealso describestasksthat the softwaremustperformto safelyoperatethis in bold followedby a trademarkof a registeredtrademarkof a registeredtrademarkof a registeredtrademarkof August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedCC26x0, CC13x0 SimpleLink WirelessMCUP owerManagementSoftwareDevelopmentReferen ceGuideSWRA486A August2015 RevisedApril2017CC26x0.

3 CC13x0 SimpleLink WirelessMCUP owerManagementSoftwareDevelopment1 AbbreviationsADCA nalog-to-digitalconverterAONA lways-ondomainCCFGC ustomerconfigurationflashareaOSCO scillatorOSC_DIGD igitalpart of oscillatormodulePRCMP ower,reset,and clockmanagementRCOSC_HFHigh-frequencyRC oscillatorRCOSC_LFLow-frequencyRC oscillatorRTCReal-timeclockRTOSReal-time operatingsystemTDCTime-to-digitalconvert erTI-RTOSTI August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedCC26x0, CC13x0 SimpleLink WirelessMCUP owerManagementSoftwareDevelopment2 PowerManagementIntroductionIn the TI-RTOS implementationfor CC26x0and CC13x0devices,powermanagementimplementsw ithinthe this implementation,you can applicationrequiresno changeswhenupgradingto new versionsof the configuringthe systemto the lowestpowermodewhilesupportingthe requestedresourcesfromthe availableat the TI website.

4 This installationincludesthe sourcecodefor followingfour powermodes: Active Idle Standby ShutdownSection3 presentsthe modesin activeand idle mode,all resourceson the deviceare standbyand shutdownmodesare optimizedfor powerconsumptionand limitedresourcesareavailablein TI-RTOS,the applicationdoesnot selectwhichpowermodeto powermodebasedon the next wakeupand whichresourcesthe applicationrequests(suchas the radioor anotherperipherals).The applicationmustcall only shutdownmodebecausewakingup fromshutdownforcesa rebootof the TI-RTOS implementationis explainedin theTI-RTOSP owerManagementUser's Guide,C.

5 \ti\tirtos_cc13xx_cc26xx_#_##_##_##\docs is documentedwithinthe TI-RTOS implementationdocument,but focuseson how to configurethehardwarewhennot samplecodein this documentis fromthe TI-RTOS implementationand the August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedCC26x0, CC13x0 SimpleLink WirelessMCUP owerManagementSoftwareDevelopment3TI-RTO SP owerModesTable1 lists the four differentpowermodesTI-RTOS supports.(1)Whenan emulatoror debuggeris attachedto the device,the wake-uptime is approximately200 s shorterbecausethe systemwill not entertrue standby.(2) SoftwareConfigurablePowerModesModeSoftwa reConfigurablePowerModesResetPin HeldActiveIdleStandbyShutdownSystemCPUA ctiveOffOffOffOffSystemSRAMOnOnRetainedO ffOffRegisterRetention(1)FullFullPartial NoNoVIMS_PD(flash)OnAvailableOffOffOffRF CORE_PD(radio) ATimefromCPUactiveto readyfor Wakeup(2) TBDTBDTBD Wake-uptime toCPUactive(2) 25 s300 s(1)

6 MsHigh-speedclockXOSC_HForRCOSC_HFXOSC_H ForRCOSC_HFOffOffOffLow-speedclockXOSC_L ForRCOSC_LFXOSC_LForRCOSC_LFXOSC_LForRCO SC_LFOffOffWakeupon RTCA vailableAvailableAvailableOffOffWakeupon pinedgeAvailableAvailableAvailableAvaila bleOffWakeuponresetpinAvailableAvailable AvailableAvailableAvailableThis sectiondescribeshow thesepowermodesare implementedin TI-RTOSand how to port activemode,the Cortex -M3 eitherexecutescodeor waitsthrougha WFI instructionfor availablein CPUpowerdomain,peripherals,and radiomay resourceson CC26x0and CC13x0devicesare availableto the applicationin thismode,the currentconsumptiondependson whichmodulesare the Cortex-M3executeda WFI instruction,it can wakeup fromany idle mode( ) is that in activemodethe CPUpowerdomainremainson, ensuringa quickwakeup.

7 The wake-uptime fromidle modeis longerbecausethe CPUpowerdomainmustbe turnedon August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedCC26x0, CC13x0 SimpleLink ModeIn idle mode,the Cortex-M3is in deep-sleepafterexecutingthe WFI Cortex-M3waitsforinterruptsto wakeup. The CPUpowerdomainis off to reducethe CPUpowerdomainincreasesthe wake-uptime of approximately25 s. Considerthis increaseif the CPUpowerdomainis off, it retainsits fromidlemode,the Cortex-M3resumesexecutingcodeat the pointit left off beforeenteringidle. The stateandregistercontentsof the idle mode,the applicationprogramcan use systemresources,includingthe high-speedcrystaloscillator,the radio,and the Cortex-M3can wakeup fromany detailson enteringidle mode,see codefor enteringidle modeis fromthe at the followingpath:C:\ti\tirtos_cc13xx_cc26xx _#_##_##_##\products\tidrivers_cc13xx_cc 26xx_#_##_##_##\packages\ti\drivers\powe r\ Idle remainon in IDLEor not The flashcan remainon to supportDMAtransactionsfromflashor if the RF coremustaccessthe the applicationrequiresthe flashto remainavailablewhilein idle, set the PRCM.

8 PDCTL1bit (seeCC13x0,CC26x0 TechnicalReferenceManual)beforeenteringi dle. If the applicationdoesnot requireflashaccesswhilein idle, clearthis bit for in idle Alwaysenablethe cacheretentionto ensurefasterstart-uptime and currentconsumptioncausedby retainingthe cacheinidle is negligiblecomparedto the total idle the CPUpowerdomain Ensurethe CPUpowerdomainis off whenthe CPUpowerdomainis turnedoff afterthe Cortex-M3executesthe WFI instruction(withthe NVICSLEEP_DEEPbit set) and August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedCC26x0, CC13x0 SimpleLink possibleoutstandingAONwritesare completed If the AONdomainhas anyoutstandingwrites,the drivermustensurethey completebeforeenteringidle.

9 This functioncall stallsthe Cortex-M3executionfor up to one SCLK_LFperiodbecausethe AONdomainrunson Put the Cortex-M3in deep-sleepthroughthe WFI instructionto enteridle. If the wake-upsourceis the RTC,the softwaremustperformAONsynchronization(in Step4) beforereadingfromtheRTCmoduleto ensurethe RTCvaluesare standbymode,the Cortex-M3waitsin deep-sleepfor interruptsto wakeup afterexecutingthe ,powerdownsystemresources,includingthe high-frequencyoscillator,radio,periphera ls,and standbyincludingthe Cortex-M3(seetheCC13x0,CC26x0 TechnicalReferenceManualfor details).Afterwakingup fromstandby,the Cortex-M3resumesexecutingprogramsat the CC13x0devicesrun on a low-powerLDOin standby,mostsystemresourcesareunavailabl ein the RTC,whichrunsin standby,to wakeup the Cortex-M3can wakeup on any interrupt-enabled, applicationmustconsiderthe latencyassociatedwith enteringand the next wakeupis in less than1 ms, the TI-RTOS implementationdoesnot theapplicationrequiresexacttiming,consid erthe latencyassociatedwith enteringand wakingup TI-RTOS implementationhandlesthis latencyby insertingwake-upeventfour RTCedges(64 s)

10 Earlierthanthe eventto ensurethe systempowerson in time to servicethe wake-upeventscheduledby the TI-RTOS standbyimplementationallowsa variationwherethe cachecontentsare ,the systemdrawsapproximately2 A morethanit doeswithoutretainingthe mainsystemRAMshouldalwaysbe retainedin mainsystemRAMretentionis also the defaultconfigurationwhenthe followingcodefor enteringand exitingstandbyis fromthe :C:\ti\tirtos_cc13xx_cc26xx_#_##_##_##\p roducts\tidrivers_cc13xx_cc26xx_#_##_##_ ##\packages\ti\drivers\ Power \ , Figure3, and Figure4 showthe codesequencefor takingthe deviceinto briefexplanationof eachstep is also StandbyEnterSequence, August2015 RevisedApril2017 SubmitDocumentationFeedbackCopyright 2015 2017,TexasInstrumentsIncorporatedCC26x0, CC13x0 SimpleLink