I2C Bus Pull-Up Resistor Calculation
1SLVA689 February2015SubmitDocumentationFeedbackC opyright 2015,TexasInstrumentsIncorporatedI2C Bus PullupResistorCalculationApplicationRepo rtSLVA689 February2015I2CBusPullupResistorCalculat ionRajanAroraABSTRACTPullupresistorcalcu lationfor I2C interfaceis a this applicationnoteweshowhow to use simpleequationsfor this of Figures1ApplicationExampleShowingI2C CommunicationBetweenthe DifferentIC's on a Systemand WithPullupResistorson I2C [RP(min)]vs PullupReferenceVoltage(VCC)............. .............................33MaximumPu llupResistance[RP(max)]vs Bus Capacitance(Cb)......................... ...........................3List of Tables1ParametricsfromI2C 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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