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HT45F75 Datasheet(PDF) 99 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 99 Page - Holtek Semiconductor Inc |
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99 / 190 page  Rev. 1.10 98 De�e��e� 1�� �01� Rev. 1.10 99 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Internal Power Supply ThisdevicecontainstheLDOandVCMfortheregulatedpowersupply.Theaccompanying blockdiagramillustratesthebasicfunctionaloperation.TheinternalLDOcanprovidethefixed voltageforPGA,ADCortheexternalcomponents;aswelltheVCMcanbeusedasthereference voltageforADCmodule.TherearefourLDOvoltagelevels,2.4V,2.6V,2.9Vor3.3V,decidedby LDOVS1~LDOVS0bitsinthePWRCregister,aswelltheVCMhastwooutputvoltagelevels, 1.05Vor1.25V,selectedbytheVCMSbitinthePGAC1register.TheLDOandVCMfunctions canbecontrolledbytheENLDOandENVCMbitsrespectivelyandcanbepoweredofftoreduce thepowerconsumption.Inaddition,theLDObypassfunctioncanbeenabledordisabledbythe LDOBPSbitintheregister. Bypass ENLDO LDO VCM �.� �.� �.� 3.3 1.05 1.�5 LDOVS[1:0] Fo� PGA� ADC powe� PGA Analog �o��on �ode voltage 1.05V o� 1.�5V VCMS ENVCM VDD VOUT/AVDD Fo� senso� powe� VCM LDOBPS Internal Power Supply Block Diagram Registers Output Voltage ADOFF ENLDO ENVCM VOUT/AVDD VCM 1 0 x Disa�le Disa�le 1 1 x Ena�le Disa�le 0 0 0 Disa�le Disa�le 0 1 0 Ena�le Disa�le 0 0 1 Disa�le Disa�le 0 1 1 Ena�le Ena�le “x” �eans don’t �a�e Power Control Table |
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