HT45F65 datasheet(146/231 Pages) HOLTEK

146 / 231 page

Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

t AD C

A/ D c onv er si on ti me

00011B

00010B

ST AR T

EO CB

AC S2 ~A CS 0

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 ti me

t AD CS

00000B

St ar t o f A /D

c onv er si on

Re se t A/ D

c onv er te r

00001B

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 CS

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

DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal

circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighinthe

ADCR0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower

irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare

usedasnormalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,then

thismayleadtosomeincreaseinpowerconsumption.

A/D Transfer Function

Asthedevicecontainsa12-bitA/Dconverter,itsfull-scaleconverteddigitisedvalueisequalto

FFFH.Sincethefull-scaleanaloginputvalueisequaltotheVDDvoltage,thisgivesasinglebit

analoginputvalueofVDDdividedby4096.

1LSB=VDD÷4096

TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation:

A/Dinputvoltage=A/Doutputdigitalvalue×VDD÷4096

Thediagramshowstheidealtransferfunctionbetweentheanaloginputvalueandthedigitised

outputvaluefortheA/Dconverter.Exceptforthedigitisedzerovalue,thesubsequentdigitised

valueswillchangeatapoint0.5LSBbelowwheretheywouldchangewithouttheoffset,andthe

lastfullscaledigitisedvaluewillchangeatapoint1.5LSBbelowtheVDDlevel.

HT45F65 Datasheet(PDF) 146 Page - Holtek Semiconductor Inc

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