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HT45R2K-C データシート(PDF) 65 Page - Holtek Semiconductor Inc |
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HT45R2K-C データシート(HTML) 65 Page - Holtek Semiconductor Inc |
65 / 105 page Rev. 1.40 64 �a��� 1�� �01� Rev. 1.40 6� �a��� 1�� �01� HT45R2K-C/-B/-A Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale HT45R2K-C/-B/-A Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale REGEN CHPEN Charge Pump VOCHP Pin Regulator VOREG Pin OPA, ADC Body Fat Circuit Description 0 × OFF VDD OFF Hi- Impedan�e Disable W�ole module is disabled� OPA/ ADC/body fat �i��uit will lose powe� 1 0 OFF VDD ON 3.3V A�tive Used w�en VDD is g�eate� t�an 3.6V (VDD> 3.6V) 1 1 ON �×VDD ON 3.3V A�tive Use w�en VDD is less t�an 3.6V (VDD= �.�V - 3.6V) Thesuggestedchargepumpclockfrequencyis20kHz.Theapplicationneedstosetthecorrectvalue togetthedesiredclockfrequency.Fora4MHzapplication,theCHPCKDbitsshouldbesettothe value11,andfora2MHzapplication,thebitsshouldbesetto5. TheREGENbitintheCHPRCregisteristheRegulator/Charge-pumpmoduleenable/disablecontrol bit.Ifthisbitisdisabled,thentheregulatorwillbedisabledandthechargepumpwillbealsobe disabledtosavepower.WhenREGEN=0,themodulewillenterthepowerdownmodeignoringthe CHPENsetting.TheA/DConverterandOPAwillalsobedisabledtoreducepower. IfREGENissetto“1”,theregulatorwillbeenabled.IfCHPENisenabled,thechargepumpwillbe activeandwilluseVDDasitsinputtogeneratethedoublevoltageoutput.Thisdoublevoltagewill beusedastheinputvoltagefortheregulator.IfCHPENissetto“0”,thechargepumpisdisabled andthechargepumpoutputwillbeequaltothechargepumpinputVDD. ItisnecessarytotakecareoftheVDDvoltage.Ifthevoltageislessthan3.6V,thenCHPENshould besetto1toenablethechargepump,otherwiseCHPENshouldbesettozero.IftheChargepump isdisabledandVDDislessthan3.6Vthentheoutputvoltageoftheregulatorwillnotbeguaranteed. Dual Slope A/D Converter ADualSlopeA/Dconverterisimplementedinthedevice.Thedualslopemoduleincludesan InstrumentationAmplifier,aProgrammableGainAmplifier,fortheamplificationofdifferential signals,anIntegratorandacomparatorforthemaindualslopeADconvertor. TherearetwospecialfunctionregistersrelatedtothisfunctionknownasADCRandADCD.The ADCRregisteristheA/Dcontrolregister,whichcontrolstheADCblockpoweron/off,thechopper clockon/off,thecharge/dischargecontrolandisalsousedtoreadoutthecomparatoroutputstatus. TheADCDregisteristheA/DChopperclockdividerregister,whichdefinesthechopperclockto theADCmodule. TheADPWRENbit,definedinADCRregister,isusedtocontroltheADCmoduleon/offfunction. TheADCCKENbit,definedintheADCRregister,isusedtocontrolthechopperclockon/off function.WhenADCCKENissetto“1”itwillenabletheChopperclock,withtheclockfrequency definedbytheADCDregister.TheADCmoduleincludestheOPA,PGA,integratorandcomparator. However,theBandgapvoltagegeneratorisindependentofthismodule.Itwillbeautomatically enabledwhentheregulatorisenabled,andalsobedisabledwhentheregulatorisdisabled.The applicationprogramshouldenabletherelatedpowertopermitthemtofunctionanddisable themwhenenteringthepowerdownmodetoconservepower.Thecharge/dischargecontrolbits, ADDISCH1andADDISCH0,areusedtocontroltheDualslopecircuitcharginganddischarging behavior.TheADCMPObitisreadonlyforthecomparatoroutput,whiletheADINTMbitscanset theADCMPOtriggermodeforinterruptgeneration.TheADCPGAinputsignalcancomefrom theDCHOPorTH/LBpinselectedbytheADISselectionbitinADCDregister.ThePGAgaincan beeither2or4determinedbythePGAGgainselectionbitintheADCDregister.Thereference voltagesoftheADCintegratorandcomparatornamedVINTandVCMPshownintheDualSlope ADCstructurediagramcanbeselectedbytheADRR0selectionbit. |
同様の部品番号 - HT45R2K-C_15 |
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同様の説明 - HT45R2K-C_15 |
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