User`s guide

Rev. 1.10 88 November 14, 2014 Rev. 1.10 89 November 14, 2014
HT66FW2230
Wireless Charger A/D Flash 8-Bit MCU
f
SYS
A/D Clock Period (t
ADCK
)
ADCK2,
ADCK1,
ADCK0
=000
(f
SYS
)
ADCK2,
ADCK1,
ADCK0
=001
(f
SYS
/2)
ADCK2,
ADCK1,
ADCK0
=010
(f
SYS
/4)
ADCK2,
ADCK1,
ADCK0
=011
(f
SYS
/8)
ADCK2,
ADCK1,
ADCK0
=100
(f
SYS
/16)
ADCK2,
ADCK1,
ADCK0
=101
(f
SYS
/32)
ADCK2,
ADCK1,
ADCK0
=110
(f
SYS
/64)
ADCK2,
ADCK1,
ADCK0
=111
(f
SUB
)
5MHz
200ns* 400ns* 800ns 1.6μs 3.2μs 6.4μs 12.8μs* Undened
10MHz 100ns*
200ns* 400ns* 800ns 1.6μs 3.2μs 6.4μs Undened
20MHz 50ns* 100ns* 200ns* 400ns* 800ns 1.6μs 3.2μs Undened
A/D Clock Period Examples
Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthe
ADOFFbitintheADCR0register.ThisbitmustbezerotopowerontheA/Dconverter.Whenthe
ADOFFbitisclearedtozerotopowerontheA/Dconverterinternalcircuitryacertaindelay,as
indicatedinthetimingdiagram,mustbeallowedbeforeanA/Dconversionisinitiated.Evenifno
pinsareselectedforuseasA/DinputsbyclearingthePAS07~PAS00bitsinthePAS0registerorthe
PAS17~PAS10bitsinthePAS1registeror,iftheADOFFbitiszerothensomepowerwillstillbe
consumed.InpowerconsciousapplicationsitisthereforerecommendedthattheADOFFissethigh
toreducepowerconsumptionwhentheA/Dconverterfunctionisnotbeingused.
ThereferencevoltagesupplytotheA/DConvertercanbesuppliedfromeitherthepositivepower
supplypin,VDD,orfromanexternalreferencesourcessuppliedonpinVREF,orfrom,aninternal
referencesources.ThedesiredselectionismadeusingtheVREFS1~VREFS0bits.AstheVREFpin
ispin-sharedwithotherfunctions,whentheVREFS1~VREFS0bitsaresetto“01”,theVREFpin
functionwillbeselectedandtheotherpinfunctionswillbedisabledautomatically.
A/D Input Pins
AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPortAaswellasother
functions.ThePAS07~PAS00bitsinthePAS0controlregisterandthePAS17~PAS10bitsinthe
PAS1controlregister,determinewhethertheinputpinsaresetupasA/Dconverteranaloginputsor
whethertheyhaveotherfunctions.Ifthesebitsforitscorrespondingpinaresettobecorrectvalues
thenthepinwillbesetuptobeanA/Dconverterinputandtheoriginalpinfunctionsdisabled.In
thisway,pinscanbechangedunderprogramcontroltochangetheirfunctionbetweenA/Dinputs
andotherfunctions.Allpull-highresistors,whicharesetupthroughregisterprogramming,willbe
automaticallydisconnectedifthepinsaresetupasA/Dinputs.Notethatitisnotnecessarytorst
setuptheA/DpinasaninputinthePACportcontrolregistertoenabletheA/Dinputaswhenthe
PAS07~PAS00bitsorthePAS17~PAS10bitsenableanA/Dinput,thestatusoftheportcontrol
registerwillbeoverridden.
TheA/Dconverterhasitsownreferencevoltagepin,VREF,howeverthereferencevoltagecanalso
besuppliedfromthepowersupplypin,achoicewhichismadethroughtheVREFS1~VREFS0bits
intheADCR1register.TheanaloginputvaluesmustnotbeallowedtoexceedthevalueofVREF.
  
 




   
   

   
 
  







A/D Input Structure