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HT66F4530 数据表(PDF) 129 Page - Holtek Semiconductor Inc |
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HT66F4530 数据表(HTML) 129 Page - Holtek Semiconductor Inc |
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129 / 224 page  Rev. 1.00 1�8 De�e��e� �1� �01� Rev. 1.00 1�9 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers Programming Considerations DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal circuitrycanbeswitchedofftoreducepowerconsumption,byclearingbitADCENto0inthe SADC0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare usedasnormalI/Opins,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel, thenthismayleadtosomeincreaseinpowerconsumption. A/D Conversion Function Asthesedevicescontaina12-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 03H 02H 01H 0 1 2 3 4093 4094 4095 VREF 4096 Analog Input Voltage A/D Conversion Result 1.5 LSB 0.5 LSB Ideal A/D Transfer Function |
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