HT66F4530 datasheet(174/224 Pages) HOLTEK

174 / 224 page

Rev. 1.00

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Rev. 1.00

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HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

Offset Calibration Procedure

TooperateintheinputoffsetcalibrationmodefortheSDOperationalAmplifiernortheSD

Comparatorn,theSDAnOFMorSDCnOFMbitshouldfirstbesetto"1"followedbythereference

inputselectionbyconfiguringtheSDAnRSPorSDCnRSPbit.NotethatiftheSDOperational

AmplifiernortheSDComparatorninputsarepin-sharedwithI/Opins,theyshouldbeconfigured

astheSDOperationalAmplifierninputsortheSDComparatorninputsfirst.

Operational Amplifier Input Offset Calibration

Step1.SetSDAnOFM=1andSDAnRSP=1,theSDOperationalAmplifiernwilloperateinthe

operationalamplifierinputoffsetCalibrationmode,S0andS2onorS3andS5on.Tomake

sureVAnOSasminimizeaspossibleaftercalibration,theinputreferencevoltageincalibration

shouldbethesameasinputDCoperatingvoltageinnormaloperation.

Step2.SetSDAnOF[5:0]=000000andthenreadtheSDAnObit.

Step3.IncreasetheSDAnOF[5:0]valueby1andthenreadtheSDAnObit.

IftheSDAnObitstatehasnotchanged,thenrepeatStep3untiltheSDAnObitstatehas

changed.

IftheSDAnObitstatehaschanged,recordtheSDAnOF[5:0]valueasVAnOS1andthengoto

Step4.

Step4.SetSDAnOF[5:0]=111111andreadtheSDAnObit.

Step5.DecreasetheSDAnOF[5:0]valueby1andthenreadtheSDAnObit.

IftheSDAnObitstatehasnotchanged,thenrepeatStep5untiltheSDAnObitstatehas

changed.

IftheSDAnObitstatehaschanged,recordtheSDAnOF[5:0]valueasVAnOS2andthengotoStep6.

Step6.RestoretheSDOperationalAmplifierninputoffsetcalibrationvalueVAnOSintothe

SDAnOF[5:0]bitfield.TheoffsetCalibrationprocedureisnowfinished.

WhereVAnOS=(VAnOS1+VAnOS2)/2.If(VAnOS1+VAnOS2)/2isnotintegral,discardthedecimal.

Comparator Input Offset Calibration

Step1.SetSDCnOFM=1andSDCnRSP=1,theSDComparatornwillnowoperateinthe

comparatorinputoffsetcalibrationmode,S6andS8onorS9andS11on.Tomakesure

VCnOSasminimizeaspossibleaftercalibration,theinputreferencevoltageincalibration

shouldbethesameasinputDCoperatingvoltageinnormaloperation.

Step2.SetSDCnOF[4:0]=00000andreadtheSDCnOUTbit.

Step3.IncreasetheSDCnOF[4:0]valueby1andthenreadtheSDCnOUTbit.

IftheSDCnOUTbitstatehasnotchanged,thenrepeatStep3untiltheSDCnOUTbitstate

haschanged.

IftheSDCnOUTbitstatehaschanged,recordtheSDCnOF[4:0]valueasVCnOS1andthengo

toStep4.

Step4.SetSDCnOF[4:0]=11111andthenreadtheSDCnOUTbit.

Step5.DecreasetheSDCnOF[4:0]valueby1andthenreadtheSDCnOUTbit.

IftheSDCnOUTbitstatehasnotchanged,thenrepeatStep5untiltheSDCnOUTbitstate

haschanged.

IftheSDCnOUTbitstatehaschanged,recordtheSDCnOF[4:0]valueasVCnOS2andthengo

toStep6.

Step6.RestoretheSDComparatorninputoffsetcalibrationvalueVCnOSintotheSDCnOF[4:0]bit

field.TheoffsetCalibrationprocedureisnowfinished.

WhereVCnOS=(VCnOS1+VCnOS2)/2.If(VCnOS1+VCnOS2)/2isnotintegral,discardthedecimal.

HT66F4530 Datasheet(PDF) 174 Page - Holtek Semiconductor Inc

HT66F4530 Datasheet(HTML) 174 Page - Holtek Semiconductor Inc

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