Transcription of I2C Bus Pull-Up Resistor Calculation - Texas Instruments
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I2C Bus Pull-Up Resistor Calculation - Texas Instruments
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. Thepullupresistorspull the line high whenit is not drivenlow by the valueof thepullupresistoris an importantdesignconsiderationfor I2C systemsas an incorrectvaluecan lead this articlewe showthe simpleequationsfor the pullupresistorcalculationwhichthe systemdesignercan use to do quickcalculationsfor theirdesign.
pulled low. The response of an RC circuit to a voltage step of amplitude VCC, starting at time t = 0 is characterized by time constant RC. The voltage waveform can be written as: (2) For VIH = 0.7 × VCC: (3) For VIL = 0.3 × VCC: (4) The rise time for the I2C bus can be written as: (5) The maximum pullup resistance is a function of the maximum ...
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