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HT66F4530 数据表(PDF) 126 Page - Holtek Semiconductor Inc

部件名 HT66F4530
功能描述  A/D Flash MCU with Dual Operational Amplifiers
PDF  224 Pages
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制造商  HOLTEK [Holtek Semiconductor Inc]
网页  http://www.holtek.com
标志 HOLTEK - Holtek Semiconductor Inc

HT66F4530 数据表(HTML) 126 Page - Holtek Semiconductor Inc

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Rev. 1.00
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HT66F4530/HT66F4540/HT66F4550
A/D Flash MCU with Dual Operational Amplifiers
HT66F4530/HT66F4540/HT66F4550
A/D Flash MCU with Dual Operational Amplifiers
A/D Converter Reference Voltage
ThereferencevoltagesupplytotheA/Dconvertercanbesuppliedfromthepositivepowersupply
pin,AVDD,orfromanexternalreferencesourcesuppliedonpinVREF.Thedesiredselection
ismadeusingtheSAVRS1andSAVRS0bits.WhentheSAVRSbitfieldissetto"01",theA/D
converterreferencevoltagewillcomefromtheAVDDpin.Otherwise,iftheSAVRSbitfieldisset
toanyothervalueexcept"01",theA/DconverterreferencevoltagewillcomefromtheVREFpin.
AstheVREFpinispin-sharedwithotherfunctions,whentheVREFpinisselectedasthereference
voltagesupplypin,theVREFpincontrolbitVREFSshouldfirstbesethightoenabletheVREF
pinfunctionthentheotherpinfunctionswillbedisabledautomatically.However,iftheinternalA/D
converterpowerAVDDisselectedasthereferencevoltage,theVREFpinmustnotbeconfigured
asthereferencevoltageinputfunctiontoavoidtheinternalconnectionbetweentheVREFpintoA/
DconverterpowerAVDD.Theanaloginputvaluesmustnotbeallowedtoexceedthevalueofthe
selectedA/Dreferencevoltage.
A/D Converter Input Signals
AlltheexternalA/Danalogchannelinputpinsarepin-sharedwiththeI/Opinsaswellasother
functions.ThecorrespondingcontrolbitsforeachA/DexternalinputpininthePxS0andPxS1
registerdeterminewhethertheinputpinsaresetupasA/Dconverteranaloginputsorwhether
theyhaveotherfunctions.IfthepinissetuptobeasanA/Danalogchannelinput,theoriginalpin
functionswillbedisabled.Inthisway,pinscanbechangedunderprogramcontroltochangetheir
functionbetweenA/Dinputsandotherfunctions.Allpullhighresistors,whicharesetupthrough
registerprogramming,willbeautomaticallydisconnectedifthepinsaresetupasA/Dinputs.Note
thatitisnotnecessarytofirstsetuptheA/Dpinasaninputintheportcontrolregistertoenablethe
A/Dinputaswhenthepin-sharedfunctioncontrolbitsenableanA/Dinput,thestatusoftheport
controlregisterwillbeoverridden.
Therearefourinternalanalogsignalsderivedfromthehighperformancebandgapreferencevoltage
VBGREF,theSDoperationalamplifier0outputsignalOPA0OandtheSDoperationalamplifier1
outputsignalOPA1O,whichcanbeconnectedtotheA/Dconverterastheanaloginputsignalby
configuringtheSAINS2~SAINS0bits.Iftheexternalchannelinputisselectedtobeconverted,
theSAINS2~SAINS0bitsshouldbesetto"000"or"101~111"andtheSACS3~SACS0bits
candeterminewhichexternalchannelisselected.Iftheinternalanalogsignalisselectedtobe
converted,theSACS3~SACS0bitsmustbeconfiguredwithanappropriatevaluetoswitchoffthe
externalanalogchannelinput.Otherwise,theinternalanalogsignalwillbeconnectedtogetherwith
theexternalchannelinput.Thiswillresultinunpredictablesituations.
ThisVBGREFishighperformancebandgapvoltagereferencewithdrivercapability.Ithasaccurate
voltagereferenceoutputwheninputsupplyvoltageVDDchangesortemperaturevaries.And,this
bandgapwillstartupatlowvoltagesupplyvoltage.Therefore,thisvoltagereferencehashighpower
supplyrejectionratio(PSRR)forlowdropoutregulator(LDO)ispresented.
SAINS[2:0]
SACS[3:0] Input Signals
Description
000� 101~111
0000~0100
AN0~AN4
Exte�nal pin analog input
0101~1111
—
Non-existed channel, input is floating.
001
0101~1111
VBGREF
Inte�nal high pe�fo��an�e Bandgap �efe�en�e voltage
010
0101~1111
OPA0O
Internal SD operational amplifier 0 output signal
011
0101~1111
OPA1O
Internal SD operational amplifier 1 output signal
100
0101~1111
GND
Unused� �onne�ted to g�ound
A/D Converter Input Signal Selection – HT66F4530



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