ETIC 2230 Podręcznik Użytkownika Pobierz pdf (Strona 90)

Rev. 1.10 90 November 14, 2014 Rev. 1.10 91 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

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A/D Conversion Timing

Programming Considerations

DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal

circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighinthe

ADCR0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower

irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare

usedasnormalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,then

thismayleadtosomeincreaseinpowerconsumption.

A/D Transfer Function

Asthedevicecontainsa12-bitA/Dconverter,itsfull-scaleconverteddigitisedvalueisequalto

FFFH.Sincethefull-scaleanaloginputvalueisequaltotheV

orV

REF

voltage,thisgivesasingle

bitanaloginputvalueofV

DD

orV

REF

dividedby4096.

1LSB=(V

orV

REF

)/4096

TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation:

A/Dinputvoltage=A/Doutputdigitalvalue×(V

orV

REF

)/4096

Thediagramshowstheidealtransferfunctionbetweentheanaloginputvalueandthedigitised

outputvaluefortheA/Dconverter.Exceptforthedigitisedzerovalue,thesubsequentdigitised

valueswillchangeatapoint0.5LSBbelowwheretheywouldchangewithouttheoffset,andthe

lastfullscaledigitisedvaluewillchangeatapoint1.5LSBbelowtheV

orV

REF

level.

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   

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Ideal A/D Transfer Function

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