HT45F12 datasheet(67/104 Pages) HOLTEK

67 / 104 page

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HT45F12

8-Bit Flash MCU with Op Amps & Comparators

HT45F12

8-Bit Flash MCU with Op Amps & Comparators

Operational Amplifier Operation

Theadvantagesofmultipleswitchesandinputpathoptions,variousreferencevoltageselection,up

to8kindsofinternalsoftwaregaincontrol,offsetreferencevoltagecalibrationfunctionandpower

downcontrolforlowpowerconsumptionenhancetheflexibilityofthesetwoOPAstosuitawide

rangeofapplicationpossibilities.

ThefollowingblockdiagramillustratesthemainfunctionalblocksoftheOPAsandComparatorin

thisdevice.

A�

A�N

A�E

A1N

A1P

MUX

10K

5�0kΩ

A1N�

A1O�N

A�O�N

R�

A1P�EL[1:0]

A1OP

C�

A1P�

A1OEN

A�OP

A�OEN

A1E

A1O�A�N

A1O�A�P

A�P

A�N�

PGAEN

A�P�

A1O�CIN

A�O�CIN

C�OUTEN

C1OUTEN

CINTO

C1INTEN

C�INTEN

C1N�EL

C�P�EL

C1OUT

C�OUT

C1N

C�P

CNP

CNP�EL

CMP1OP

CMP�OP

Edge

�elect

CMPE�[1:0]

CMPINT

CINTO

MUX

A�P�EL[1:0]

Operational Amplifier Functions

TheOPAsareconnectedtogetherinternallyinaspecificwayandtheoutputofOPAscanalsobe

connectedtotheinternalcomparatorsasshownintheblockdiagram.EachoftheOPAshasitsowncontrol

enable/disablefunction,thecalibrationprocedureandtheprogrammablegainfunctionofOPA2.

EachoftheinternalOPAsallowsforacommonmodeadjustmentmethodofitsinputoffsetvoltage.

Thecalibrationstepsareasfollowing:

• SetA1OFM=1tosetuptheoffsetcancellationmode,hereS3Cisclosed.

• SetA1RStoselectwhichinputpinistobeusedasthereferencevoltage-S1CorS2Cisclosed

• AdjustA1OF0~A1OF4untiltheoutputstatuschanges

• SetA1OFM=0torestorethenormalOPAmode

• Repeatthesameprocedurefromsteps1to4forOPA2

A1 OP

A1 P

A1 OF 0~ A1 OF 4

A1 EN

S1 C

S2 C

S3 C

A1 N

A1 E

A1 RS

A1 OF M

S1 C

OF F

S2 C

OF F

S3 C

OF F

"X ": don' t c ar e

A1 OE N

HT45F12 bảng dữ liệu(PDF) 67 Page - Holtek Semiconductor Inc

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