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HT45F77 Datasheet(PDF) 112 Page - Holtek Semiconductor Inc |
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HT45F77 Datasheet(HTML) 112 Page - Holtek Semiconductor Inc |
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112 / 203 page  Rev. 1.20 112 De�e��e� 1�� 201� Rev. 1.20 113 De�e��e� 1�� 201� HT45F77 Body Fat Scale Flash MCU HT45F77 Body Fat Scale Flash MCU Programming Considerations DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighinthe ADCR0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower irrespectiveofwhatanalogvoltageisappliedtotheirinputlines. A/D Transfer Function Thisdevicecontainsa20-bitΔΣA/Dconverter,itsfull-scaleconverteddigitisedvalueisfrom 524287to-524288indecimalvalue.Theconverteddataformatisformedbyatwo’scomplement binaryvalue.TheMSBoftheconverteddataisthesignedbit.Sincethefull-scaleanaloginput valueisequaltotheVCMorΔVREFvoltage,selectedbytheVREFSbitinADCR0register,thisgives asinglebitanaloginputvalueofVCMorΔVREFdividedby524288. 1LSB=(VCMorΔVREF)/524288 TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation: ΔSI_I=(PGAGN×ADGN×ΔDI±)+(DCSET×ΔVR_I) ΔVR_I=VREGN×ΔVR± ADC_Conversion_Data=(ΔSI_I÷ΔVR_I)×K WhereKisequalto219 Note:ThePGAGN,ADGN,VREGNvaluesaredecidedbyPGS,AGS,VGScontrolbits. ΔSI_I:DifferentialInputSignalafterprocess PGAGN:ProgrammableGainAmplifiergain ADGN:ADCgain ΔDI±:DifferentialInputsignal DCSET:Offsetvoltage ΔVR±:DifferentialReferencevoltage ΔVR_I:DifferentialReferenceinputvoltageafterprocess VREGN:Referencevoltagegain DuetothedigitalsystemdesignoftheΔΣADC,themaximumnumberoftheADCconvertedvalue is524287andtheminimumvalueis-524288,therefore,wecanhavethemiddlenumber0.The ADC_Conversion_Dataequationillustratesthisrangeofconverteddatavariation. A/D conversion data (2’s compliment, Hexadecimal) Decimal Value 0x7FFFF 52�287 0x80000 -52�288 TheaboveADCconversiondatatableillustratestherangeofADCconversiondata. ThefollowingdiagramshowstherelationshipbetweentheDCinputvalueandtheADCconverted datawhichispresentedbytheTwo’sComplement. |
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