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HT45F4MA bảng dữ liệu(PDF) 126 Page - Holtek Semiconductor Inc

tên linh kiện HT45F4MA
Giải thích chi tiết về linh kiện  Power Bank Flash MCU
PDF  145 Pages
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nhà sản xuất  HOLTEK [Holtek Semiconductor Inc]
Trang chủ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F4MA bảng dữ liệu(HTML) 126 Page - Holtek Semiconductor Inc

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Rev. 1.20
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Rev. 1.20
127
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HT45F4MA/HT45FH4MA/HT45FH4MA-1
Power Bank Flash MCU
HT45F4MA/HT45FH4MA/HT45FH4MA-1
Power Bank Flash MCU
LVD Operation
TheLowVoltageDetectorfunctionoperatesbycomparingthepowersupplyvoltage,VDD,witha
pre-specifiedvoltagelevelstoredintheLVDCregister.Thishasarangeofbetween2.7Vand4.0V.
Whenthepowersupplyvoltage,VDD,fallsbelowthispre-determinedvalue,theLVDObitwillbe
sethighindicatingalowpowersupplyvoltagecondition.TheLowVoltageDetectorfunctionis
suppliedbyareferencevoltagewhichwillbeautomaticallyenabled.Whenthedeviceispowered
downthelowvoltagedetectorwillremainactiveiftheLVDENbitishigh.AfterenablingtheLow
VoltageDetector,atimedelaytLVDSshouldbeallowedforthecircuitrytostabilisebeforereadingthe
LVDObit.NotealsothatastheVDDvoltagemayriseandfallratherslowly,atthevoltagenearsthat
ofVLVD,theremaybemultiplebitLVDOtransitions.
VD D
V LV D
LV DE N
LV DO
t LV DS
LVD Operation
TheLowVoltageDetectoralsohasitsowninterruptwhichiscontainedwithinoneoftheMulti-
functioninterrupts,providinganalternativemeansoflowvoltagedetection,inadditiontopollingthe
LVDObit.TheinterruptwillonlybegeneratedafteradelayoftLVDaftertheLVDObithasbeenset
highbyalowvoltagecondition.WhenthedeviceispowereddowntheLowVoltageDetectorwill
remainactiveiftheLVDENbitishigh.Inthiscase,theLVFinterruptrequestflagwillbeset,causing
aninterrupttobegeneratedifVDDfallsbelowthepresetLVDvoltage.Thiswillcausethedeviceto
wake-upfromtheSLEEPorIDLEMode,howeveriftheLowVoltageDetectorwakeupfunctionisnot
requiredthentheLVFflagshouldbefirstsethighbeforethedeviceenterstheSLEEPorIDLEMode.



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