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HT45F5Q-2 Datasheet(PDF) 77 Page - Holtek Semiconductor Inc |
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HT45F5Q-2 Datasheet(HTML) 77 Page - Holtek Semiconductor Inc |
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77 / 117 page  Rev. 1.00 �� ���� 0�� �01� Rev. 1.00 �� ���� 0�� �01� HT45F5Q-2 Charger Flash MCU HT45F5Q-2 Charger Flash MCU Operational Amplifiers ThebatterychargemodulecontainsthreeoperationalAmplifierfunctions.TheregisterOPVOSis usedtocontroltheOPA2relatedfunctions. OPVOS Register Bit 7 6 5 4 3 2 1 0 Name OOFM — OOF5 OOF4 OOF3 OOF� OOF1 OOF0 R/W R/W — R/W R/W R/W R/W R/W R/W POR 0 — 1 0 0 0 0 0 Bit7 OOFM:OPA2normaloperationorinputoffsetvoltagecancellationmodeselectionbit 0:Normaloperation 1:Offsetcalibrationmode TheinputreferencevoltagecomesfromOPA2positiveinputpinatoffsetvoltage cancellationmode. Bit6 Unimplemented,readas"0" Bit5~0 OOF5~OOF0:OPA2inputoffsetvoltagecalibrationcontrolbits Operational Amplifiers Operation ThisisanOPA2withinputoffsetcalibrationfunction.ThecalibrateddataisstoredintheOOFbit field.TheOOFMbitisusedtocontrolcancellationmodeselection.Theinputreferencevoltagecan comefromOPA2Ppinincalibrationmode.TheOPA2PistheOPA2positiveinputand10xA2P signalisOPA2analogoutputvoltage.TheOPA2digitaloutputflagisOPO,whichisusedforOPA2 calibrationmode.Finally,theOP2ENbitisusedtoenabletheOPA2function. Offset calibration procedure IftheOPA2functionisused,itshouldbeconfiguredastheOPA2functionbythePAS0register. Step1:SetOOFM=1,theOPA2isnowunderoffsetcalibrationmode.Tomakesuretheinput offsetvoltageVOSasminimizeaspossibleaftercalibration,theinputreferencevoltage incalibrationmodeshouldbethesameasinputDCoperatingvoltageinnormalmode operation. Step2:SetOOF[5:0]=000000thenreadOPOflag Step3:LetOOF=OOF+1thenreadOPOflag,iftheOPOflagstateischanged,recordthedataas VOS1 Step4:SetOOF[5:0]=111111thenreadOPOflag. Step5:LetOOF=OOF-1thenreadOPOflag,iftheOPOflagstateischanged;recordthedataas VOS2 Step6:restoreVOS=(VOS1+VOS2)/2toOOFbits,thecalibrationisfinished. If(VOS1+VOS2)/2isnotintegral,discardthedecimal. ResidueVOS=VOUT-VIN |
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