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HT45R4U датащи(PDF) 55 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 55 Page - Holtek Semiconductor Inc |
55 / 105 page Rev. 1.10 �4 �a��� 1�� �01� Rev. 1.10 �� �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD A/D Transfer Function Asthedevicescontaina12-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 01 23 409 3 409 44 09 54 09 6 An al og I npu t V ol t age 1. 5 LS B V DD or V RE F 409 6 Ideal A/D Transfer Function Programming Considerations DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighinthe ADCR0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare usedasnormalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,then thismayleadtosomeincreaseinpowerconsumption. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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