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.
pullup resistors pull the line high when it is not driven low by the open-drain interface. The value of the pullup resistor is an important design consideration for I2C systems as an incorrect value can lead to signal loss. In this article we show the simple equations for the pullup resistor calculation which the system
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