HT66F005 datasheet(78/109 Pages) HOLTEK

78 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

t AD C

A/ D c onv er si on ti me

011B

010B

ST AR T

EO CB

AC S4 , AC S1 ,

AC S0

Po we r- on

Re se t

E nd of A /D

c onv er si on

1: D ef i ne por t c on fi gur at io n

2: S el ec t anal og ch a nnel

St ar t of A /D

c onv er si on

Re se t A/ D

c onv er te r

A/ D sa mp li ng t im e

t AD S

000B

St ar t o f A /D

c onv er si on

Re se t A/ D

c onv er te r

001B

St ar t o f A /D

c onv er si on

Re se t A/ D

c onv er te r

E nd of A /D

c onv er si on

A/ D sa mp li ng t im e

t AD S

of f

t ON 2S T

t AD C

A/ D c onv er si on ti me

of f

AD OF F

AD C M odul e

A/D Conversion Timing

Programming Considerations

DuringmicrocontrolleroperateswheretheA/Dconverterisnotbeingused,theA/Dinternal

circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighinthe

ADCR0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower

irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare

usedasnormalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,then

thismayleadtosomeincreaseinpowerconsumption.

Thepower-onresetconditionoftheA/Dconvertercontrolregisterswillensurethattheshared

functionpinsaresetupasA/Dconverterinputs.IfanyoftheA/Dconverterinputpinsaretobeused

forotherfunctions,thentheA/Dconvertercontrolregisterbitsmustbeproperlysetuptodisablethe

A/Dinputconfiguration.

A/D Transfer Function

Asthedevicescontaina12-bitA/Dconverter,itsfull-scaleconverteddigitisedvalueisequalto

FFFH.Sincethefull-scaleanaloginputvalueisequaltotheVDDorVREFvoltage,thisgivesasingle

bitanaloginputvalueofVDDorVREFdividedby4096.

1LSB=(VDDorVREF)÷4096

TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation:

A/Dinputvoltage=A/Doutputdigitalvalue×(VDDorVREF)÷4096

Thediagramshowstheidealtransferfunctionbetweentheanaloginputvalueandthedigitised

outputvaluefortheA/Dconverter.Exceptforthedigitisedzerovalue,thesubsequentdigitised

valueswillchangeatapoint0.5LSBbelowwheretheywouldchangewithouttheoffset,andthe

lastfullscaledigitisedvaluewillchangeatapoint1.5LSBbelowtheVDDorVREFlevel.

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