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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT67F488 датащи(PDF) 100 Page - Holtek Semiconductor Inc |
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HT67F488 датащи(HTML) 100 Page - Holtek Semiconductor Inc |
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100 / 171 page  Rev. 1.60 100 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM ADC �odule O� START EOCB ACS4~ACS0 off on off on tO��ST tADCS A/D sa�pling ti�e tADCS A/D sa�pling ti�e Reset A/D conve�sion Sta�t of A/D conve�sion tADC A/D conve�sion ti�e tADC A/D conve�sion ti�e 00011B 00010B 00000B 00001B ADOFF End of A/D conve�sion Reset A/D conve�sion End of A/D conve�sion Sta�t of A/D conve�sion Reset A/D conve�sion Powe�-on Reset 1. Define po�t configu�ation �. Select analog channel Sta�t of A/D conve�sion A/D Conversion Timing Programming Considerations DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighinthe ADCR0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare usedasnormalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,then thismayleadtosomeincreaseinpowerconsumption. 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. |
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