Transcription of VoltageGeneratingCircuitsforLCDContrast Control
1 ,calledVl,Veeorthebiasvoltage, ,eitherthelogicvoltage(+ +5v) (Vdd) ,Hantronix, **1N41481N5817 Figure1+5v0v+47uF22uFLCD togivethebestcontrast, , ,tiepin3to+ , # ,thenextpulsewillcauseittowrap-aroundtot he33% ,Hantronix, +5v++11010 F47 F*30v33 H**+VS+VS+VSGND*TantalumorlowESRaluminum electrolytic** CCVREF73+5v++1510 F22 F*30v47 H**+VSGND*TantalumorlowESRaluminumelectr olytic** 234678220pFRVMAXCSDHIDLOWFBCTRLADJ470 1N5819 ZTX750 MAX749 ADJUSTON/OFFF igure3 MAXOUTPUTVOLTAGE-5V-8V-12V-15VR(ohms)VMA X240k360k580k750kTable1 ,batteryoperated, in-house (320x240) ,theThemanufacture sspecificationforanLCDofthistype,suchast heHantornixHDM3224C-S,callsforaVeevoltag eof+ ,Hantronix, , ,t=Minimumsetup/hold,0nSmin., ++1510 F*35v47 H**+VIN+VINGND*TantalumorlowESRaluminume lectrolytic** 130k 1N5819LT1615 Figure5 Copyright2001,Hantronix, , ,powersequencing, (V) ,evenforashortperiodoftime, signal (V) ,exceptthechargepumpinFigure1, , ,CA94086 Milpitas,CA95035(408)737-7600(408) ~50ms>20ms>20ms0~50ms>0ms>0msPowerOnPowe rOffFigure6
