HT45F4M datasheet(94/138 Pages) HOLTEK

94 / 138 page

Rev. 1.10

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HT45F4M

Lithium Battery Backup Power ASSP MCU

HT45F4M

Lithium Battery Backup Power ASSP MCU

t AD C

A/ D c onv er si on ti me

00011 B

00010 B

ST AR T

EO CB

AC S4 ~A CS 0

Po we r- on

Re se t

En d of A /D

co nv er si on

1: D ef i ne por t c on fi gu ra ti on

2: S el ec t a na lo g ch annel

St ar t of A /D

co nv er si on

Re se t A /D

co nv er te r

A/ D sa mp li ng ti me

t AD S

00000 B

St ar t o f A /D

co nv er si on

Re se t A/ D

co nv er te r

00001 B

St ar t o f A /D

co nv er si on

Re se t A/ D

co nv er te r

En d of A /D

co nv er si on

A/ D sa mp li ng ti me

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

A DC Mo du le

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-scaleanaloginputvalueisequaltotheVDDorVREFvoltage,thisgivesasingle

bitanaloginputvalueofVDDorVREFdividedby4096.

1LSB=(VDDorVREF)/4096

TheA/DConverterinputvoltagevaluecanbecalculatedusingthefollowingequation:

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

Thediagramshowstheidealtransferfunctionbetweentheanaloginputvalueandthedigitised

outputvaluefortheA/Dconverter.Exceptforthedigitisedzerovalue,thesubsequentdigitised

valueswillchangeatapoint0.5LSBbelowwheretheywouldchangewithouttheoffset,andthe

lastfullscaledigitisedvaluewillchangeatapoint1.5LSBbelowtheVDDorVREFlevel.

FF EH

(

)

A/ D Co nv er si on

Re su lt

FFFH

FF DH

03 H

02 H

01 H

0. 5 LS B

409 3 409 44 09 54 09 6

An al og I npu t V ol t age

1. 5 LS B

V DD or V RE F

409 6

Ideal A/D Transfer Function

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