Low-powerapplicationsrepresentasignificantportion
ofthefuturemarketforembeddedsystems.Every
year,moredesignersarerequiredtomakedesigns
portable,wirelessandenergyefficient.Thisdocument
seekstosimplifythetransitiontolow-powerapplica-
tionsbyprovidingasinglelocationforthefoundations
oflow-powerdesignforembeddedsystems.The
examplesdiscussedinthisdocumentwillfocuson
powerconsumptionfromtheviewpointofthemicrocon-
troller(MCU).Asthebrainoftheapplication,theMCU
typicallyconsumesthemostpowerandhasthemost
controloverthesystempowerconsumption.
Aswithalldesigns,itisimportantforthedesignerofa
low-powerembeddedsystemtoconsidertrade-offs
betweenpowerconsumption,andotherfactors,suchas
cost,sizeandcomplexity.Whilesomelow-powertech-
niquescanbeusedwithnocosttothesystem,others
mayrequiretrade-offs.Thisguidewillgiveexamplesof
thesetrade-offswhereapplicable.However,itisnot
feasibletodiscussallpossibletrade-offs,soanembed-
deddesignershouldkeepinmindthepossiblesystem
levelimpactsofpower-savingtechniques.
ThisdesignguidewillrefertoLow-Powermodes
availableonPIC
®
MCUs,butwillnotgointodetail
aboutthesefeatures.Forinformationaboutthe
Low-PowermodesavailableonPICMCUdevices,
refertoAN1267,“nanoWattandnanoWattXLP™
Technologies:AnIntroductiontoMicrochip’s
Low-PowerDevices”(DS01267).AN1416Low-PowerDesignGuideAuthors:BrantIveyMainSourcesofPowerConsumptionMicrochipTechnologyInc.InCMOSdevices,suchasmicrocontrollers,thetotalpowerconsumptioncanbebrokendownintotwobroadINTRODUCTIONcategories:dynamicpowerandstaticpower.DynamicpoweristhepowerconsumedwhenthemicrocontrollerLow-powerapplicationsrepresentasignificantportionisrunningandperformingitsprogrammed
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