Using a UART to Implement a 1-Wire Bus Master

Abstract:Thisapplicationnoteexplainshowtouseamicroprocessor'sUARTtoimplementa1-Wire®busmaster.Itincludesanexplanationoftherequiredelectricalinterface,UARTconfiguration,andtimingrelationshipbetweenUARTand1-Wiresignals.TheflexibilityofferedinsettingupUARTbytetimingallowsstraightforwardimplementationof1-Wiretimeslotsaswellastheresetandpresencedetectpulses.WiththeinclusionofdeeptransmitandreceiveFIFOs,severalbytevaluescanbetransferredonthe1-Wirebuswithjustafewclockcyclesperbitrequiredfromthemainprocessor.Maxim>AppNotes>1-WireDevicesUARTsKeywords:UART,DS9097E,1-Wire,iButton,busmaster,1-Wiresignals,microprocessor,1wireSep10,2002APPLICATIONNOTE214UsingaUARTtoImplementa1-WireBusMasterAbstract:Thisapplicationnoteexplainshowtouseamicroprocessor'sUARTtoimplementa1-Wirebusmaster.Itincludesanexplanationoftherequiredelectricalinterface,UARTconfiguration,andtimingrelationshipbetweenUARTand1-Wiresignals.TheflexibilityofferedinsettingupUARTbytetimingallowsstraightforwardimplementationof1-Wiretimeslotsaswellastheresetandpresencedetectpulses.WiththeinclusionofdeeptransmitandreceiveFIFOs,severalbytevaluescanbetransferredonthe1-Wirebuswithjustafewclockcyclesperbitrequi