HT45F5Q datasheet(79/114 Pages) HOLTEK

79 / 114 page

Rev. 1.10

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Rev. 1.10

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HT45F5Q

Charger Flash MCU

HT45F5Q

Charger Flash MCU

Programming Considerations

DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal

circuitrycanbeswitchedofftoreducepowerconsumption,byclearingtheENADCbitinthe

SADC0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower

irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare

usedasnormalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,then

thismayleadtosomeincreaseinpowerconsumption.

A/D Transfer Function

Asthedevicecontainsa12-bitA/Dconverter,itsfull-scaleconverteddigitisedvalueisequalto

FFFH.Sincethefull-scaleanaloginputvalueisequaltotheVDDorVREFvoltage,thisgivesasingle

bitanaloginputvalueofVDDorVREFdividedby4096.

1LSB=(VDDorVREF)/4096

TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation:

A/Dinputvoltage=A/Doutputdigitalvalue×(VDDorVREF)/4096

Thediagramshowstheidealtransferfunctionbetweentheanaloginputvalueandthedigitised

outputvaluefortheA/Dconverter.Exceptforthedigitisedzerovalue,thesubsequentdigitised

valueswillchangeatapoint0.5LSBbelowwheretheywouldchangewithouttheoffset,andthe

lastfullscaledigitisedvaluewillchangeatapoint1.5LSBbelowtheVDDorVREFlevel.

FF EH

(

)

A/ D Co nv er si on

Re su lt

FFFH

FF DH

03 H

02 H

01 H

0. 5 LS B

409 3 409 44 09 54 09 6

An al og I nputV ol t age

1. 5 LS B

V DD or V RE F

409 6

Ideal A/D Transfer Function

HT45F5Q 데이터시트(PDF) 79 Page - Holtek Semiconductor Inc

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