HT45F12 datasheet(73/104 Pages) HOLTEK

73 / 104 page

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HT45F12

8-Bit Flash MCU with Op Amps & Comparators

HT45F12

8-Bit Flash MCU with Op Amps & Comparators

Comparator Functions

ThesestwocomparatorscanoperatetogetherwiththeOPAsorstandaloneasshowninthemain

functionalblocksoftheOPAsandComparators.

Eachoftheinternalcomparatorsallowsforacommonmodeadjustmentmethodofitsinputoffset

voltage.

Thecalibrationstepsareasfollowing:

• SetC1OFM=1tosetuptheoffsetcancellationmode,hereS3Aisclosed.

• SetC1RStoselectwhichinputpinistobeusedasthereferencevoltage-S1AorS2Aisclosed.

• AdjustC1OF0~C1OF4untiltheoutputstatuschanges.

• SetC1OFM=0torestorethenormalcomparatormode.

• Repeatthesameprocedurefromsteps1to4forcomparator2.

C1 N

C1 OU TE N

C1 OU T

CM P1

CN P

Ti me r/ Ev ent C oun te r

C1 RS

C1 OF M

S1 A

OF F

S2 A

OF F

S3 A

OF F

"X ": don' t ca re

S2 A

S1 A

S3 A

Thefollowingdiagramandtableillustratethecomparatorsswitchcontrolsettingandthe

correspondingconnections.Notethatsomeswitchcontrolselectionswillforcesomeswitchestobe

controlledbyhardwareautomatically.

Forexample:

• WhentheCMP1incalibrationmode,i.e.C1OFM=1,thentheSW1,SW3willbeforcedto

close.TheCNPSELandC1NSELbitswillbeset“1”byhardware,andthesetwobitswillbe

readoutas“1”.Aftertheoffsetvoltagecalibration,theCNPSELandC1NSELwillbebacktoits

originalvalue.

• WhentheCMP2incalibrationmode,i.e.C2OFM=1,thentheSW1,SW2willbeforcedto

close.

• TheCNPSELandC2PSELbitswillbeset“1”byhardware,andthesetwobitswillbereadout

as“1”.Aftertheoffsetvoltagecalibration,theCNPSELandC2PSELwillbebacktoitsoriginal

value.

• IftheCNPSEL=1,theA1O2CINandA2O2CINwillbeforcedto“0”,i.e.IftheSWIisclosed,

andthatwillforceS7CandS10Dtoopen.

• IftheCNPSEL=0andtheA1O2CIN=1,theA2O2CINwillbeforcedto“0”,i.e.IftheS7Cis

closed,andthatwillforceS10Dtoopen.

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