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HT45F65 데이터시트(PDF) 62 Page - Holtek Semiconductor Inc

부품명 HT45F65
상세설명  Glucose Meter 8-Bit Flash MCU
PDF  231 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F65 데이터시트(HTML) 62 Page - Holtek Semiconductor Inc

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HT45F65/HT45F66/HT45F67
Glucose Meter 8-Bit Flash MCU
FormostapplicationsaresistorconnectedbetweenVDDandtheRESpinandacapacitorconnected
betweenVSSandtheRESpinwillprovideasuitableexternalresetcircuit.Anywiringconnectedto
theRESpinshouldbekeptasshortaspossibletominimiseanystraynoiseinterference.
ForapplicationsthatoperatewithinanenvironmentwheremorenoiseispresenttheEnhancedReset
Circuitshownisrecommended.
RE S
0. 1~ 1 m F
10k W ~
100k W
VD D
VS S
0. 01 m F* *
V DD
1N 4148*
300 W *
External RES Circuit
Note:*ItisrecommendedthatthiscomponentisaddedforaddedESDprotection.
**Itisrecommendedthatthiscomponentisaddedinenvironmentswherepowerlinenoiseis
significant.
MoreinformationregardingexternalresetcircuitsislocatedinApplicationNoteHA0075Eonthe
Holtekwebsite.
PullingtheRESPinlowusingexternalhardwarewillalsoexecuteadevicereset.Inthiscase,asin
thecaseofotherresets,theProgramCounterwillresettozeroandprogramexecutioninitiatedfrom
thispoint.
RE S
In te r nal R es et
0. 9 V DD
0. 4 V DD
t RS TD + t SST
RES Reset Timing Chart
Low Voltage Reset – LVR
Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageof
thedevice,whichisselectedviaaconfigurationoption.Ifthesupplyvoltageofthedevicedrops
towithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery,theLVRwill
automaticallyresetthedeviceinternally.TheLVRincludesthefollowingspecifications:Foravalid
LVRsignal,alowvoltage,i.e.,avoltageintherangebetween0.9V~VLVRmustexistforgreaterthan
thevaluetLVRspecifiedintheA.C.characteristics.IfthelowvoltagestatedoesnotexceedtLVR,the
LVRwillignoreitandwillnotperformaresetfunction.Oneofarangeofspecifiedvoltagevalues
forVLVRcanbeselectedusingconfigurationoptions.
LV R
In te r nal R es et
t RS TD + t SST
Low Voltage Reset Timing Chart



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