Transcription of Choosing an Appropriate Pull-up/Pull-down …
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Choosing an Appropriate Pull-up/Pull-down …
ApplicationReportSLVA485 October2011 ChoosinganAppropriatePull- :opendrain(opencollectorforbipolaroutput s)orpush- pull (alsoknownastotempole). , ,opendrainoutputsprovidemoreflexibilityt oadesignerastheycanbepulled-uptoanyvolta gefoundinthesystem,whichcanbeusefulwhent heyserveasinputstoa processorwhichmightrequirea (PG)andLowBattery(LBO)onswitchingregulat ors,resetandPowerFail(PFO)onsupplyvoltag esupervisors(SVS),andLowBattery,PowerFai l, pull -uporpull-downresistor,thefactorstha tshouldbeconsideredwhenselectinga pull -uporpull-downresistor,andhowtocalcu latea (PGFloatingHigh)..22 TypicalPGOutputEquivalentCircuit(PGLow). .33 ResetOutputEquivalentCircuit(ResetFloati ngLow)..54 ResetOutputEquivalentCircuit(ResetHigh). . October2011 ChoosinganAppropriatePull-up/ pull -downRe sistorforOpenDrainOutputsSubmitDocumenta tionFeedbackCopyright 2011,TexasInstrumentsIncorporated_+Compa ratorILKGQ1 (OFF)PGVPGIPull-upRPull-upENIENVOUTI nside the criticalvoltagewithina systemandoutputsa resetsignalif theopendrainoutputin needofa somevoltagein powerconverter,a PGoutputis routinelyusedtodrivetheenableinputofa PGoutputis lowif thechip s outputvoltageis belowa theLBIpinvoltagedropsbelowa whethera pull -upora pull -downresistoris ,theTPS62067step-downconverterhasa PGoutputthatit driveslowif thechip s outputvoltageis notin ,PGneedsapull-upresistorthatpullsthePGpi nhighwhenthec
Comparator IOL Q1 (ON) PG V PG IPull-up R Pull-up EN IEN V OUT Inside the IC www.ti.com Calculating the Pull-upResistor Range than Vout.For the calculation of the maximum value of RPull-up, the maximum value of ILKG is used because it would result in the largest voltage drop across RPull-up.Also, assuming that the PG output feeds …
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