Transcription of Calculator for CAN Bit Timing Parameters - TI.com
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Calculator for CAN Bit Timing Parameters - TI.com
1 SPRAC35 March2016 SubmitDocumentationFeedbackCopyright 2016,TexasInstrumentsIncorporatedCalcula torfor CANBit TimingParametersApplicationReportSPRAC35 March2016 CalculatorforCANBitTimingParametersAdamH aunABSTRACTC ontrollerAreaNetwork(CAN)nodesuse user-specifiedtimingparametersto samplethe asynchronousbitstreamand recoverthe typicallybasedon the frequencyof the severaloptionsavailablefor a givenfrequency,and someof themwillallowa creationof a bit timingcalculatorto maximizethe oscillatortolerancefor the CANmoduleson TI this applicationreportcanbe downloadedfromthe followingURL: a trademarkof othertrademarksare the propertyof the bit timingparametersrequiresat leastthreeinputs: The desiredbit rate,whichis commonacrossthe entirebus. An estimateof the propagationdelaybetweenthe mostdistantnodeson the bus The CANmoduleclockfrequency,whichis usedto derivethe bitstreamsamplingclockThe propagationdelaycomesfromtwo mainsources:the speedof electromagneticpropagationalongthebus wiringand extradelaydue to transceivers,isolation,or bit timingcalculatormustprovideat leastfive outputs: The baudrate prescaler(BRP),whichdeterminesthe singleperiodis referredto as a time quantum(Tq).
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