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HT45R2K-C データシート(PDF) 65 Page - Holtek Semiconductor Inc

部品番号 HT45R2K-C
部品情報  Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R2K-C データシート(HTML) 65 Page - Holtek Semiconductor Inc

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Rev. 1.40
64
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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.


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