HT45F56 datasheet(65/90 Pages) HOLTEK

65 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

Comparators

Thedevicecontainsananalogcomparatorwhichoperateswiththe6-bitR-2RD/Aconverterand

operationalamplifierinapplications.Thesefunctionsofferflexibilityviathecorrespondingregisters

controlledfeaturessuchaspower-down,hysteresis,etc.InsharingtheirpinswithnormalI/Opins

thecomparatordoesnotwastepreciousI/Opinsiftheirfunctionsareotherwiseunused.

AD1

AD2

−

CMPEN

CMPOP

Debounce

Circuit

Debounce Interrupt

CMPHY[1:0]

Pin-shared

select

6-bit

D/A

DA[5:0]

CNSEL[1:0]

CPSEL[1:0]

SEN

OPA

GAS[3:0]

OPAEN

DSTAG[2:0]

Comparator Interrupt

Comparator Block Diagram

Comparator Operation

Thecomparatorfunctionsareusedtocomparetwoanalogvoltagesandprovideanoutputbasedon

theirinputdifference.Anypull-highresistorsconnectedtothesharedcomparatorinputpinswillbe

automaticallydisconnectedwhenthecorrespondingcomparatorfunctionalpinsareselected.Asthe

comparatorinputsapproachtheirswitchinglevel,somespuriousoutputsignalsmaybegenerated

onthecomparatoroutputduetotheslowrisingorfallingnatureoftheinputsignals.Thiscanbe

minimisedbythehysteresisfunction.Ideallythecomparatorshouldswitchatthepointwherethe

positiveandnegativeinputssignalsareatthesamevoltagelevel.However,unavoidableinput

offsetsintroducesomeuncertaintieshere.Thehysteresisfunction,ifenabled,willalsoincreasethe

switchingoffsetvalue.Thehysteresiswindowwillbechangedfordifferentselections.

Aninterruptwillbegeneratedwhenthecomparatoroutputchangesstatefromlowtohigh.Another

interruptwillbegeneratedwhenthecomparatoroutputrisingedgetransitionoccursandkeepsmore

thanacertaindebouncetimedeterminedbytheDSTAG2~DSTAG0bits.Ifthecomparatoroutput

risingedgetransitionoccursbutdoesnotkeepmorethanthespecificdebouncetime,thedebounce

circuitinterruptwillnotbegenerated.

Comparator Registers

Fullcontrolovertheinternalcomparatorisprovidedviathecontrolregisters,CMPC,MUXCand

DEBC.Thecomparatoroutputisrecordedviaabitintherespectivecontrolregister.Thecomparator

powerdowncontrolbit,CMPEN,isusedtocontroltheoverallcomparatorfunction.

Name

Bit

CMPC

CMPOP

—

CMPHY1 CMPHY0

—

CMPEN

MUXC

—

CNSEL1 CNSEL0

—

CPSEL1 CPSEL0

DEBC

—

DSTAG2 DSTAG1 DSTAG0

Comparator Registers List

HT45F56 Datasheet(PDF) 65 Page - Holtek Semiconductor Inc

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