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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F3W 데이터시트(PDF) 138 Page - Holtek Semiconductor Inc |
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HT45F3W 데이터시트(HTML) 138 Page - Holtek Semiconductor Inc |
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138 / 167 page  Rev. 1.50 138 De�e��e� 01� �01� Rev. 1.50 139 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU Sensor Constant Current Generator Circuit Thedeviceincludesaconstantcurrentgeneratorfordrivingthepressurebridgesensor.Thisis formedusingaprogrammablevoltagereferenceandoperationalamplifier. Constant Current Generator Operation TheconstantcurrentgeneratormustbefirstenabledbysettingtheCCVREFENbitinthe CCVREFCregisterhigh.Ifclearedtozerothenthecircuitswillbepowereddown,whichwillbe animportantconsiderationinbatterypoweredequipment.TheVCCREFcircuitoutputvoltagecan beselectedtobebetween0.2V~0.95V,inintervalsof0.05V,providing16selectionsusingbitsin theCCVREFCregister.ThisvoltageisavailableonpinCCVREFtowhichacapacitorshouldbe connectedforstabilisationpurposes.Thisvoltageisprovidedtothepositiveinputofaninternal operationalamplifier.Byconnectinganexternalresistortothenegativeoperationalamplifierinput, aconstantcurrentcanbesetup. CCVIN CCVIP MCU OPA + - VCCREF 0.�V~0.95V CCVREF Constant Current Generator Block Diagram |
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