HT67F5652 datasheet(191/224 Pages) HOLTEK

191 / 224 page

Rev. 1.00

190

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Rev. 1.00

191

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HT67F5652

24-Bit Delta Sigma A/D + LCD Flash MCU

HT67F5652

24-Bit Delta Sigma A/D + LCD Flash MCU

C Type Biasing

ForCtypebiasingthedevicecanhaveeitherexternalpinorinternalpowersourceselectedvia

byregisterbitsLCDP1~LCDP0,LCDvoltagesourceissuppliedonexternalpinPLCD,V1,V2

(LCDP[1:0]=00)orinternalpower(LCDP[1:0]=01,10or11)togeneratetheinternalbiasing

voltages.

WhenpowersourceisfrompinPLCD,TheCtypebiasingschemeusesaninternalchargepump

circuit,whichcangeneratevoltageshigherthanwhatissuppliedonPLCD.Thisfeatureisuseful

inapplicationswherethemicrocontrollersupplyvoltageislessthanthesupplyvoltagerequiredby

theLCD.AnadditionalchargepumpcapacitormustalsobeconnectedbetweenpinsC1andC2to

generatethenecessaryvoltagelevels.

FourvoltagelevelsVSS,VA,VBandVCareutilized.

ThedevicehasanintegrateddepletioncircuitforLCDvoltagesource.ThiscouldbetheDPNVREF

(~1.08V),afixed3VvoltagegeneratedbyanadditionalregulatororinternalpowerVDDtogenerate

biasingvoltagewhenbitsLCDP1~LCDP0areconfigured01,10or11.

WhenpowersourceisfrompinV1orVA(VA=VDD),whichismaximumbias.ThepinPLCDmust

connecta0.1μFtoground.ThevoltageVAwillhaveavalueequaltoV1orVDD.VBwillhavea

valueequaltoVA×2/3andVCwillhaveavalueequaltoVA×1/3.

WhenpowersourceisfrompinPLCDorVB(VB=RegulatorOutput3V),thevoltageVAisgenerated

internallyandhasavalueofPLCD×1.5or3V×3/2.VBwillhaveavalueequaltoVA×2/3andVC

willhaveavalueequaltoVA×1/3.

WhenpowersourceisfrompinV2orVC(VC=DPNVREF),thevoltageVAisgeneratedinternallyand

hasavalueofV2×3orDPNVREF×3.VBwillhaveavalueequaltoVA×2/3andVCwillhavea

valueequaltoVA×1/3.

TheconnectiontotheVMAXpindependsuponthebiasandthevoltagethatisappliedtothePLCD

pin,thedetailsareshowninthetable.Itisextremelyimportanttoensurethatthesechargepump

generatedinternalvoltagesdonotexceedthemaximumVDDvoltageof5.5V.

Condition

VMAX Connection

VDD > PLCD × 1.5

Conne�t VMAX to VDD

Othe�wise

Conne�t VMAX to V1

C Type Bias VMAX Pin Connection

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