SMBus的I / O扩展控制LCD偏置电压

摘要：一个SMBus™I/O扩展，升压转换器，数字电位器组成的电路实现的SMBus控制的液晶显示屏的对比度。

Maxim>AppNotes>DIGITALPOTENTIOMETERSDISPLAYDRIVERSKeywords:LCDdrivers,SMBus,I/Oexpanders,digitalpotentiometers,stepupconvertersMar14,2005APPLICATIONNOTE3467SMBusI/OExpanderControlsLCDBiasVoltageAbstract:AcircuitconsistingofanSMBusI/Oexpander,step-upconverter,anddigitalpotentiometerenablestheSMBustocontrolthecontrastofanLCD.Small,handheld,battery-powereddevicesoftenfeatureanLCDpanelandamicrocontrollerwithlimitedI/Opins.TheSMBusisusefulforcontrollingsystemfunctionsunderlimitedI/Oand,forconvenience,itshouldalsobeabletocontroltheLCDcontrast.InFigure1,thistaskisaccomplishedwithanSMBusI/Oexpander(IC2),astep-upconverter(IC1),andadigitalpotentiometer(IC3).