HT45F75 datasheet(160/190 Pages) HOLTEK

160 / 190 page

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Body Fat Measurement Function

Thebodyfatcircuitconsistsofasinewavegenerator,anamplifierandafilter.Thecircuithasbeen

designedformaximumflexibilityandhasahighdegreeoffunctionalintegrationtoimplementa

bodyfatmeasurementfunction.ThecircuitispoweredbytheLDO.

Sine Wave Generator

Thesinewavegeneratorconsistsofafrequencydivider,counter,RAM,10-bitDACandOP0.The

circuitcangenerateasinewaveoutputwithafrequencyrangeof5kHz~200kHzusinga32×9

bitRAMforthesinewavepatternsimulation.ThefrequencydividerwillmultiplybyDN/Mto

generateaclockforthecounter.Thefollowingpointsmustbenotedtounderstandhowthesine

waveisgenerated:

• Systemclock/M=sinewavefrequency

• Systemclock×(DN/M)=thecountrateofthecounter

• MmustbeamultipleofNand8

• M=N×DN

• DNR=DN/2

• DN:sinewavecycledatanumericalvalue(DN≤64)

• DNR:thedatanumericalvalueofthe1/2sinewavecyclestoredinRAM(DNR≤32)

Refertothefollowingtableandfigureformoredetails.

System Frequency

4.8MHz

9.6MHz

14.4MHz

The frequency of

sine wave(kHz)

200 100

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PDNR-1

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PDNR-3

HT45F75 Datasheet(PDF) 160 Page - Holtek Semiconductor Inc

HT45F75 Datasheet(HTML) 160 Page - Holtek Semiconductor Inc

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