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HT45F75 Datasheet(PDF) 158 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 158 Page - Holtek Semiconductor Inc |
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158 / 190 page  Rev. 1.10 158 De�e��e� 1�� �01� Rev. 1.10 159 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Low Voltage Detector – LVD ThedevicehasaLowVoltageDetectorfunction,alsoknownasLVD.Thisenabledthedeviceto monitorthepowersupplyvoltage,VDD,orLVDINpininputvoltage,andprovideawarningsignal shoulditfallbelowacertainlevel.Thisfunctionmaybeespeciallyusefulinbatteryapplications wherethesupplyvoltagewillgraduallyreduceasthebatteryages,asitallowsanearlywarning batterylowsignaltobegenerated.TheLowVoltageDetectoralsohasthecapabilityofgenerating aninterruptsignal. LVD Register TheLowVoltageDetectorfunctioniscontrolledusingasingleregisterwiththenameLVDC. Threebitsinthisregister,VLVD2~VLVD0,areusedtoselectLVDfunctionoperationcondition.A lowvoltageconditionisindicatedwhentheLVDObitisset.IftheLVDObitislow,thisindicates thattheVDDorLVDINpininputvoltageisabovethereferencevoltage.TheLVDENbitisused tocontroltheoverallon/offfunctionofthelowvoltagedetector.Settingthebithighwillenable thelowvoltagedetector.Clearingthebittozerowillswitchofftheinternallowvoltagedetector circuits.Asthelowvoltagedetectorwillconsumeacertainamountofpower,itmaybedesirableto switchoffthecircuitwhennotinuse,animportantconsiderationinpowersensitivebatterypowered applications. LVDC Register Bit 7 6 5 4 3 2 1 0 Na�e — — LVDO LVDEN — VLVD� VLVD1 VLVD0 R/W — — R R/W — R/W R/W R/W POR — — 0 0 — 0 0 0 Bit7~6 Unimplemented,readas“0” Bit5 LVDO:LVDOutputFlag 0:NoLowVoltageDetect 1:LowVoltageDetect Bit4 LVDEN:LowVoltageDetectorControl 0:Disable 1:Enable Bit3 Unimplemented,readas“0” Bit2~0 VLVD2~VLVD0:LVDfunctionoperationconditionselection 000:LVDINpin,VLVDIN≤1.04V 001:2.2V 010:2.4V 011:2.7V 100:3.0V 101:3.3V 110:3.6V 111:4.0V WhentheVLVDbitfieldissetto000B,theLVDfunctionwillbeimplementedby comparingtheLVDreferencevoltagewithavoltagevalueof1.04Vwhichisderived fromtheLVDINpin.Otherwise,theLVDfunctionwilloperatebycomparingtheLVD referencevoltagewithaspecificvoltagevaluewhichisgeneratedbytheinternalLVD circuitwhentheVLVDbitfieldissettoanyothervalueexcept000B. |
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