标签: 逻辑供电

Embeddedapplicationsincreasinglywantmoreintegrationandpower,inlessspaceforlesscost.UsinglowpowerSerialEEPROMs(SEE)forapplicationfirmware,lookuptables,andmicrocodecoupledwithsmallfootprintsmakesforpermanentstorageatrespectablesavings.Oneadditionalmethodofsavingonthepowerbudgetisselectivelypoweringoffcomponentswhennotneeded,abasicforembeddedpowermanagement.Thelow-powerSEEsofferedbyMicrochipTechnologyInc.,offeranadditionalbenefit,poweringtheSEEfromamicrocontrollerport.ThisallowsthehostcontrollertonotonlymanipulatetheSerialEEPROMReadsandWrite,butalsotheperiodswhenitispoweredofforon.Satellitecommunicationsusethistechniquetosavepowerandtotaldoseaccumulation.WecallthistechniquePOWERPORT.ThemicrocontrollerportmusthavesufficientIoh(sourcecurrent)tosustainthevoltageandcurrentforallmemoryfunctions,READ,ERASE,andWRITE.Obviously,notallmemoryorperipheraldevicescouldbepoweredthusly,butMicrochip’sSEEdeviceswillfunctioninthisenvironment.AN535LogicPoweredSerialEEPROMsAuthore:RichardJ.FisherParameterConditionsMicrochipTechnologyInc.BruceNegleyICCSTANDBYNotinanactiveoperationwhileMicrochipTechnolgyInc.VCCissupplied.ICCREADThepartisinaREADoperation.EmbeddedapplicationsincreasinglywantmoreICCPEAKTheBYTE/PAGEWRITEandintegrationandpower,inlessspaceforlesscost.UsingWRITEERAS……