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HT45F75 Datasheet(PDF) 61 Page - Holtek Semiconductor Inc |
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HT45F75 Datasheet(HTML) 61 Page - Holtek Semiconductor Inc |
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61 / 190 page  Rev. 1.10 �0 De�e��e� 1�� �01� Rev. 1.10 �1 De�e��e� 1�� �01� HT45F75 Body Fat Scale Flash MCU HT45F75 Body Fat Scale Flash MCU Low Voltage Reset – LVR Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageofthe device.TheLVRfunctionisalwaysenabledwithaspecificLVRvoltageVLVR.Ifthesupplyvoltage ofthedevicedropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery, theLVRwillautomaticallyresetthedeviceinternallyandtheLVRFbitintheCTRLregisterwill alsobesethigh.ForavalidLVRsignal,alowsupplyvoltage,i.e.,avoltageintherangebetween 0.9V~VLVRmustexistforatimegreaterthanthatspecifiedbytLVRintheA.C.characteristics.Ifthe lowsupplyvoltagestatedoesnotexceedthisvalue,theLVRwillignorethelowsupplyvoltageand willnotperformaresetfunction.TheactualVLVRvaluecanbeselectedbytheLVS7~LVS0bitsin theLVRCregister.IftheLVS7~LVS0bitsarechangedtosomecertainvaluesbytheenvironmental noiseorsoftwaresetting,theLVRwillresetthedeviceafter2~3fSUBclockcycles.Whenthis happens,theLRFbitintheCTRLregisterwillbesethigh.Afterpowerontheregisterwillhavethe valueof01010101B.NotethattheLVRfunctionwillbeautomaticallydisabledwhenthedevice entersthepowerdownmode. LV R In te r nal R es et t RS TD + t SST Note:tRSTDispower-ondelay,typicaltime=16.7ms Low Voltage Reset Timing Chart • LVRC Register Bit 7 6 5 4 3 2 1 0 Na�e LVS7 LVS� LVS5 LVS� LVS3 LVS� LVS1 LVS0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 1 0 1 0 1 0 1 Bit7~0 LVS7~LVS0:LVRvoltageselect 01010101:2.1V 00110011:2.55V 10011001:3.15V 10101010:3.8V Othervalues:MCUreset(registerisresettoPORvalue). Whenanactuallowvoltageconditionoccurs,asspecifiedbyoneofthefourdefined LVRvoltagevaluesabove,anMCUresetwillbegenerated.Theresetoperationwill beactivatedafter2~3fSUBclockcycles.Inthissituationtheregistercontentswill remainthesameaftersucharesetoccurs. Anyregistervalue,otherthanthefourdefinedLVRvaluesabove,willalsoresultin thegenerationofanMCUreset.Theresetoperationwillbeactivatedafter2~3fSUB clockcycles.HoweverinthissituationtheregistercontentswillberesettothePOR value. |
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