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HT45F5R Datasheet(PDF) 98 Page - Holtek Semiconductor Inc |
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HT45F5R Datasheet(HTML) 98 Page - Holtek Semiconductor Inc |
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98 / 138 page  Rev. 1.10 98 De�e��e� 1�� �01� Rev. 1.10 99 De�e��e� 1�� �01� HT45F5R Charger ASSP Flash MCU HT45F5R Charger ASSP Flash MCU Programming Considerations DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal circuitrycanbeswitchedofftoreducepowerconsumption,byclearingbitADCENto0inthe SADC0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare usedasnormalI/Opins,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel, thenthismayleadtosomeincreaseinpowerconsumption. A/D Conversion Function Asthedevicecontainsa12-bitA/Dconverter,itsfull-scaleconverteddigitisedvalueisequalto FFFH.Sincethefull-scaleanaloginputvalueisequaltotheactualA/Dconverterreferencevoltage, VREF,thisgivesasinglebitanaloginputvalueofVREFdividedby4096. 1LSB=VREF÷4096 TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation: A/Dinputvoltage=A/Doutputdigitalvalue×VREF÷4096 Thediagramshowstheidealtransferfunctionbetweentheanaloginputvalueandthedigitised outputvaluefortheA/Dconverter.Exceptforthedigitisedzerovalue,thesubsequentdigitised valueswillchangeatapoint0.5LSBbelowwheretheywouldchangewithouttheoffset,andthe lastfullscaledigitisedvaluewillchangeatapoint1.5LSBbelowtheVREFlevel.Notethatherethe VREFvoltageistheactualA/DconverterreferencevoltagedeterminedbytheSAVRSfield. FFFH FFEH FFDH 0�H 0�H 01H 0 1 � � 409� 4094 4095 409� VREF 409� Analog Input Voltage A/D Conversion Result 1.5 LSB 0.5 LSB Ideal A/D Transfer Function |
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