HT45F75 datasheet(110/190 Pages) HOLTEK

110 / 190 page

Rev. 1.10

110

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Rev. 1.10

111

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

�0 Digital output

Two's �o�ple�ent

DC input value

0111 1111 1111 1111 1111

1000 0000 0000 0000 0000

VREGN

DCSET

VREFN

VREFP

AIN

AIP

VREGN

ADGN

PGAGN







A/D Converted Data

TheADCconverteddataisrelatedtotheinputvoltageandthePGAselections.Theformatofthe

ADCoutputisatwo’scomplementbinarycode.Thelengthofthisoutputcodeis20bitsandthe

MSBisasignedbit.WhentheMSBis“0”,whichrepresentstheinputis“positive”,ontheother

hand,astheMSBis“1”,itrepresentstheinputis“negative”.Themaximumvalueis524287and

theminimumvalueis-524288.Iftheinputsignalisoverthemaximumvalue,theconverteddatais

limitedbythe524287,andiftheinputsignalislessthantheminimumvalue,theconverteddatais

limitedby-524288.

A/D Converted Data to Voltage

Thedesignercanrecovertheconverteddatabythefollowingequations:

IfMSB=0(PositiveConverteddata):

InputVoltage=(Converteddata-0)×(LSB/PGA)

IftheMSB=1(NegativeConverteddata):

Inputvoltage=(Two’scomplementofconverteddata-0)×(LSB/PGA)

Note:Two’scomplement=One’scomplement+1

HT45F75 Datasheet(PDF) 110 Page - Holtek Semiconductor Inc

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