Dallas点滴式充电计时芯片的应用(英文).pdf

Dallas点滴式充电计时芯片的应用(英文).pdf

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1、APPLICATIONNOTE82ApplicationNote82UsingtheDallasTricklechargeTimekeeperDESCRIPTIONtion.OnlythreewiresarerequiredtocommunicatewithTheDallasSemiconductorDS1302TrickleChargetheclock/RAM:(1)RST(Reset),(2)I/O(DataLine),andTimeKeepingChipisaprogrammable3–wir

2、eserial(3)SCLK(SerialClock).Datacanbetransferredtoandinterfaceclockwithatricklechargecircuitforusingbothfromtheclock/RAMonebyteatatimeorinaburstofuprechargeableandnon–rechargeablebackupsupplies.to31bytes.TheDS1302isdesignedtooperateonveryTherealtimeclo

3、ck/calendarprovidesseconds,min-lowpowerandretaindataandclockinformationonlessutes,hours,day,date,month,yearinformation.Thethan1microwatt.TheDS1302isdesignedtobecom-endofthemonthdateisautomaticallyadjustedforpletelycompatiblewithdesignsthatarecurrentlyu

4、singmonthswithlessthan31days,includingcorrectionsfortheDS1202.ThiscompatibilityallowstheDS1302tobeleapyear.Theclockoperatesineitherthe24–hourordroppeddirectlyintoaDS1202socket.Thenthe12–hourformatwithanAM/PMindicator.TheDS1302optionaltricklechargecircu

5、itontheDS1302canbealsoprovides31bytesofnonvolatileSRAMfordatausedtobackupthesystemtimeanddatawithasuperstorage.InterfacingtheDS1302withamicroprocessorcaporarechargeablebattery.issimplifiedbyusingasynchronousserialcommunica-DS1302PROGRAMMABLETRICKLECHAR

6、GERFigure1R1VCC2R2VCC1PIN1PIN8R31OF16SELECT1OF21OF3(NOTE:ONLY1010CODEENABLESCHARGER)SELECTSELECTTCS=TRICKLECHARGESELECTDS=DIODESELECTRS=RESISTORSELECTTCSTCSTCSTCSDSDSRSRSBIT7BIT6BIT5BIT4BIT3BIT2BIT1BIT0Copyright1995byDallasSemiconductorCorporation.090

7、7941/6AllRightsReserved.Forimportantinformationregardingpatentsandotherintellectualpropertyrights,pleaserefertoDallasSemiconductordatabooks.APPLICATIONNOTE82TRICKLECHARGERcanbecalculatedasillustratedinthefollowingexample.Thetricklechargecircuitisshowni

8、nFigure1alongwithAssumethatasystempowersupplyof5Visappliedtothetricklechargeregister.ToenablethetricklechargerVCC2andasupercapisconnectedtoVCC1.Also,thedesiredpaththroughthecircuitmustbeselectedassumethatthetricklechargerhasbeenenabledw

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