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HT67F5652 bảng dữ liệu(PDF) 192 Page - Holtek Semiconductor Inc

tên linh kiện HT67F5652
Giải thích chi tiết về linh kiện  24-Bit Delta Sigma A/D LCD Flash MCU
PDF  224 Pages
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nhà sản xuất  HOLTEK [Holtek Semiconductor Inc]
Trang chủ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT67F5652 bảng dữ liệu(HTML) 192 Page - Holtek Semiconductor Inc

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HT67F5652
24-Bit Delta Sigma A/D + LCD Flash MCU
HT67F5652
24-Bit Delta Sigma A/D + LCD Flash MCU
LCD Driver Output
ThenumberofCOMandSEGoutputssuppliedbytheLCDdriver,aswellasitsbiasingandwave
typeselections,aredependentuponhowtheLCDcontrolbitsareprogrammed.TheBiasType,
whetherCorRtypeisalsoselectedbyasoftwarecontrolbit.
ThenatureofLiquidCrystalDisplaysrequirethatonlyACvoltagescanbeappliedtotheirpixels
astheapplicationofDCvoltagestoLCDpixelsmaycausepermanentdamage.Forthisreasonthe
relativecontrastofanLCDdisplayiscontrolledbytheactualRMSvoltageappliedtoeachpixel,
whichisequaltotheRMSvalueofthevoltageontheCOMpinminusthevoltageappliedtothe
SEGpin.ThisdifferentialRMSvoltagemustbegreaterthantheLCDsaturationvoltageforthe
pixeltobeonandlessthanthethresholdvoltageforthepixeltobeoff.
TherequirementtolimittheDCvoltagetozeroandtocontrolasmanypixelsaspossiblewith
aminimumnumberofconnectionsrequiresthatbothatimeandamplitudesignalisgenerated
andappliedtotheapplicationLCD.Thesetimeandamplitudevaryingsignalsareautomatically
generatedbytheLCDdrivercircuitsinthemicrocontroller.Whatisknownasthedutydetermines
thenumberofcommonlinesused,whicharealsoknownasbackplanesorCOMs.Thedutyis1/4
andequatestoaCOMnumberof4,thereforedefinesthenumberoftimedivisionswithineach
LCDsignalframe.Twotypesofsignalgenerationarealsoprovided,knownasTypeAandTypeB,
therequiredtypeisselectedviatheTYPEbitintheLCDCregister.TypeBofferslowerfrequency
signals,howeverlowerfrequenciesmayintroduceflickeringandinfluencedisplayclarity.



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