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Rev. 1.50 170 August 28, 2017 Rev. 1.50 171 August 28, 2017

HT66F0175/HT66F0185

A/D Flash MCU with EEPROM

HT66F0175/HT66F0185

A/D Flash MCU with EEPROM

LVD Operation

TheLowVoltageDetectorfunctionoperatesbycomparingthepowersupplyvoltage,V

,witha

pre-speciedvoltagelevelstoredintheLVDCregister.Thishasarangeofbetween2.0Vand4.0V.

Whenthepowersupplyvoltage,V

,fallsbelowthispre-determinedvalue,theLVDObitwillbe

sethighindicatingalowpowersupplyvoltagecondition.TheLowVoltageDetectorfunctionis

suppliedbyareferencevoltagewhichwillbeautomaticallyenabled.Whenthedeviceispowered

downthelowvoltagedetectorwillremainactiveiftheLVDENbitishigh.AfterenablingtheLow

VoltageDetector,atimedelayt

LVDS

shouldbeallowedforthecircuitrytostabilisebeforereadingthe

LVDObit.NotealsothatastheV

voltagemayriseandfallratherslowly,atthevoltagenearsthat

ofV

LVD

,theremaybemultiplebitLVDOtransitions.















LVD Operation

TheLowVoltageDetectoralsohasitsowninterruptwhichiscontainedwithinoneoftheMulti-

functioninterrupts,providinganalternativemeansoflowvoltagedetection,inadditiontopolling

theLVDObit.Theinterruptwillonlybegeneratedafteradelayoft

LVD

aftertheLVDObithasbeen

sethighbyalowvoltagecondition.WhenthedeviceispowereddowntheLowVoltageDetector

willremainactiveiftheLVDENbitishigh.Inthiscase,theLVFinterruptrequestagwillbeset,

causinganinterrupttobegeneratedifV

fallsbelowthepresetLVDvoltage.Thiswillcausethe

devicetowake-upfromtheSLEEPorIDLEMode,howeveriftheLowVoltageDetectorwakeup

functionisnotrequiredthentheLVFagshouldberstsethighbeforethedeviceenterstheSLEEP

orIDLEMode.

Holtek HT66F0175 User Manual

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