HT45F4M datasheet(98/138 Pages) HOLTEK

98 / 138 page

Rev. 1.10

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Rev. 1.10

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HT45F4M

Lithium Battery Backup Power ASSP MCU

HT45F4M

Lithium Battery Backup Power ASSP MCU

CPR Register

Bit

Name

—

DTPSC1 DTPSC0

DT�

DT1

DT0

R/W

—

R/W

POR

—

Bit7~5

Unimplemented,readas0

Bit4~3

DTPSC1~DTPSC0:deadtimeprescalerdivisionratioselect

00:fD=fH/1

01:fD=fH/2

10:fD=fH/4

11:fD=fH/8

Bit2~0

DT2~DT0:deadtimeselect

000:deadtimeis[(1/fD)-(1/fH)]~(1/fD)

001:deadtimeis[(2/fD)-(1/fH)]~(2/fD)

010:deadtimeis[(3/fD)-(1/fH)]~(3/fD)

011:deadtimeis[(4/fD)-(1/fH)]~(4/fD)

100:deadtimeis[(5/fD)-(1/fH)]~(5/fD)

101:deadtimeis[(6/fD)-(1/fH)]~(6/fD)

110:deadtimeis[(7/fD)-(1/fH)]~(7/fD)

111:deadtimeis[(8/fD)-(1/fH)]~(8/fD)

Over Current and Voltage Protection

Thedeviceincludesanovervoltageandovercurrentprotectionfunctionwhichprovidesa

protectionmechanismforthebatterychargeanddischargeapplications.

• OVPprotection

Topreventtheoutputvoltagefromexceeding5.4V,theOVPinputvoltageiscomparedwitha

referencevoltagegeneratedbya6-bitD/Aconverter.The6-bitD/Aconverterpowerissupplied

bytheexternalpowerpinnamedDAPWR.OncetheOVPinputvoltageisgreaterthanthe

referencevoltage,itwillforcetheOUTHandOUTLsignalsinactive,i.e.,theOUTHsignalwill

beforcedintoahighstateandtheOUTLsignalwillbeforcedintoalowstatebeforethepolarity

control,toturntheexternalMOSoffforovervoltageprotection.

• OCPprotection

Topreventthepossibilityoflargebatterycurrents,theOCPinputvoltagefromthebatterysense

resistoriscomparedwithareferencevoltagegeneratedbyan8-bitD/Aconverter.The8-bitD/

AconverterpowerissuppliedbytheexternalpowerpinnamedDAPWR.OncetheOCPinput

voltageisgreaterthanthereferencevoltage,itwillforcetheOUTHandOUTLsignalsinactive,

i.e.,theOUTHsignalwillbeforcedintoahighstateandtheOUTLsignalwillbeforcedintoa

lowstatebeforethepolaritycontrol,toturntheexternalMOSoffforovercurrentprotection.

TheOUTHandOUTLsignalscanbeforcedtoaninactivestatewheneitheranovervoltageoran

overcurrenteventoccurs.Ifanovervoltageoranovercurrenteventoccurs,thecorresponding

interruptwillbegenerated.Oncetheovervoltageorovercurrentconditionhasdisappeared,the

OUTHandOUTLsignalswillrecovertodrivethePWMoutput.

Theoperationalamplifierintheovercurrentprotectioncircuitrycanbeconfiguredinaninvertingor

non-invertingOPAconfigurationtosensethebatterycurrentwhenthebatteryisundergoingacharge

ordischargeoperation.ItisrecommendedthattheOPAshouldbeinanon-invertingmodeduringa

chargeoperationandinaninvertingmodeduringadischargeoperation.

MoreinformationfortheOUTHandOUTLsignalpolarityandoutputcontrolisdescribedinthe

TMPCregister.

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