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HT46R0042 Scheda tecnica(PDF) 53 Page - Holtek Semiconductor Inc

Il numero della parte HT46R0042
Spiegazioni elettronici  Cost-Effective A/D 8-Bit OTP MCU
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Produttore elettronici  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
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HT46R0042 Scheda tecnica(HTML) 53 Page - Holtek Semiconductor Inc

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HT46R0042
Cost-Effective A/D 8-Bit OTP MCU
HT46R0042
Cost-Effective A/D 8-Bit OTP MCU
Programming Considerations
Whenprogramming,thespecialattentionmustbegiventothePCR[7:0]bitsintheregister.Ifthese
bitsareallclearedtozero,noexternalpinswillbeselectedforuseasA/Dinputpinsallowingthe
pinstobeusedasnormalI/Opins.Whenthishappens,theinternalA/Dcircuitrywillbepower
down.SettingtheADONBbithighhastheabilitytopowerdowntheinternalA/Dcircuitry,which
maybeanimportantconsiderationinpowersensitiveapplications.
A/D Transfer Function
Asthedevicecontainsa12-bitA/Dconverter,itsfull-scaleconverteddigitisedvalueisequalto
FFFH.Sincethefull-scaleanaloginputvalueisequaltotheVDDvoltage,thisgivesasinglebit
analoginputvalueofVDDdividedby4096.Thediagramshowstheidealtransferfunctionbetween
theanaloginputvalueandthedigitisedoutputvaluefortheA/Dconverter.
Notethattoreducethequantisationerror,a0.5LSBoffsetisaddedtotheA/DConverterinput.
Exceptforthedigitisedzerovalue,thesubsequentdigitisedvalueswillchangeatapoint0.5LSB
belowwheretheywouldchangewithouttheoffset,andthelastfullscaledigitizedvaluewillchange
atapoint1.5LSBbelowtheVDDlevel.
FF EH
(
)
A/ D C onv er si on
Re su lt
FFFH
FF DH
03H
02H
01H
0. 5 LS B
0
12
3
409 3 4094 4095 409 6
A nal og In pu t Vo lt age
1. 5 LS B
V DD
409 6
Ideal A/D Transfer Function
A/D Programming Example
ThefollowingtwoprogrammingexamplesillustratehowtosetandimplementanA/Dconversion.
Inthefirstexample,themethodofpollingtheEOCBbitintheADCR0registerisusedtodetect
whentheconversioncycleiscomplete,whereasinthesecondexample,theA/Dinterruptisusedto
determinewhentheconversioniscomplete.


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