Transcription of I2C Bus Pull-Up Resistor Calculation
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1 SLVA689 February2015 SubmitDocumentationFeedbackCopyright 2015,TexasInstrumentsIncorporatedI2C Bus PullupResistorCalculationApplicationRepo rtSLVA689 February2015I2 CBusPullupResistorCalculationRajanAroraA BSTRACTP ullupresistorcalculationfor I2C interfaceis a this applicationnoteweshowhow to use simpleequationsfor this of Figures1 ApplicationExampleShowingI2C CommunicationBetweenthe DifferentIC's on a Systemand WithPullupResistorson I2C [RP(min)]vs PullupReferenceVoltage(VCC)..33 MaximumPullupResistance[RP(max)]vs Bus Capacitance(Cb)..3 List of Tables1 ParametricsfromI2C communicationstandardis the mostlywidelyusedinter-chipcommunications tandardin today is an open-drain/open-collectorcommunicationst andardwhichimpliesintegratedcircuits(IC s) with differentvoltagesupplyrails can be connectedfor be connectedfromthe I2C linesto the supplyto enablecommunicationas shownin Figure1.
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