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HT7044A-3 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT7044A-3 Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
7 / 15 page Rev. 1.00 7 April 18, 2013 HT70xxA-3 Functional Description TheHT70xxA-3seriesisasetofvoltagedetectors equippedwithahighstabilityvoltagereferencewhich isconnectedtothenegativeinputofacomparator denotedasVREFinthefollowingfigureforNMOS outputvoltagedetector. When the voltage drop to the positive input of thecomparator(i,e,VB)ishigherthanVREF,VOUT goeshigh,M1turnsoff,andVBisexpressedas VBH=VDD×(RB+RC)/(RA+RB+RC).IfVDDisdecreasedso thatVBfallstoavaluelessthanVREF,thecomparator outputinvertsfromhightolow,VOUTgoeslow,VCis high,M1turnson,RCisbypassed,andVBbecomes: VBL=VDD×RB/(RA+RB),whichislessthanVBH.Byso doing,thecomparatoroutputwillstaylowtoprevent thecircuitfromoscillatingwhenVB≈VREF. IfVDDfallsbelowtheminimumoperatingvoltage,the outputbecomesundefined.WhenVDDgoesfromlow toVDD×RB/(RA+RB)>VREF,thecomparatoroutputand VOUTgoeshigh. Thedetectablevoltageisdefinedas: VDET(−)=(RA+RB+RC)/(RB+RC)×VREF Thereleasevoltageisdefinedas: VDET(+)=(RA+RB)/RB×VREF Thehysteresiswidthis: VHYS=VDET(+)−VDET(−) V SS V DD R A R B R C M1 MN Co mp ar at or V OU T RL V RE F V B V C NMOS Output Voltage Detector ThefiguredemonstratestheNMOSoutputtypewith positiveoutputpolarity(VOUTisnormallyopen,active low).TheHT70xxA-3seriesalsosuppliesoptions for other output types with active high outputs. Applicationcircuitsshownareexamplesofpositive outputpolarity(normallyopen,activelow)unless otherwisespecified. |
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