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HT45R4U датащи(PDF) 68 Page - Holtek Semiconductor Inc

номер детали HT45R4U
подробное описание детали  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R4U датащи(HTML) 68 Page - Holtek Semiconductor Inc

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Rev. 1.10
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HT45R4U
TinyPowerTM A/D Type
e-Banking ASSP OTP MCU with LCD
ForapplicationsthatoperatewithinanenvironmentwheremorenoiseispresenttheResetCircuit
shownisrecommended.
RE S/ PE 1
0. 1~ 1 m F
10 k W ~
100k W
VD D
VSS
0. 01 m F* *
V DD
1N 4148 *
30 0 W *
Note:"*"ItisrecommendedthatthiscomponentisaddedforaddedESDprotection
"**"Itisrecommendedthatthiscomponentisaddedinenvironmentswherepowerlinenoiseis
significant.
External RES Circuit
RES Pin Reset
ThistypeofresetoccurswhenthemicrocontrollerisalreadyrunningandtheRESpinisforcefully
pulledlowbyexternalhardwaresuchasanexternalswitch.Inthiscaseasinthecaseofotherreset,
theProgramCounterwillresettozeroandprogramexecutioninitiatedfromthispoint.
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
Themicrocontrollercontainsalowvoltageresetcircuitinordertomonitorthesupplyvoltageofthe
device.TheLVRfunctionisalwaysenabledwithaspecificLVRvoltage,VLVR.Ifthesupplyvoltageof
thedevicedropstowithinarangeof0.9V~VLVRsuchasmightoccurwhenchangingthebattery,theLVR
willautomaticallyresetthedeviceinternallyandtheLVRFbitintheSMOD1registerwillalsobeset
to1.ForavalidLVRsignal,alowsupplyvoltage,i.e.,avoltageintherangebetween0.9V~VLVRmust
existforatimegreaterthanthatspecifiedbytLVRintheA.C.characteristics.Ifthelowsupplyvoltage
statedoesnotexceedthisvalue,theLVRwillignorethelowsupplyvoltageandwillnotperformareset
function.TheactualVLVRvalueisfixedbytheLVSbitsintheLVRCregister.IftheLVS7~LVS0bits
haveanyothervalue,whichmayperhapsoccurduetoadverseenvironmentalconditionssuchasnoise,
theLVRwillresetthedeviceafter2~3fLIRCclockcycles.Whenthishappens,theLRFbitintheSMOD1
registerwillbesetto1.Afterpowerontheregisterwillhavethevalueof01010101B.NotethattheLVR
functionwillbeautomaticallydisabledwhenthedeviceentersthepowerdownmode.
LV R
In te r nal R es et
t RS TD + t SST
Low Voltage Reset Timing Chart


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