使用MAX7219/7221推动更高的电压或电流

摘要：技术扩增器MAX7219和MAX7221串行接口LED驱动器的电压和电流驱动能力。

Maxim>AppNotes>DISPLAYDRIVERSKeywords:LEDdisplaydrivers,LEDdrivers,displaydrivers,SPI,serial,7segment,7-segmentSep09,2002APPLICATIONNOTE1196UsingtheMAX7219/7221toDriveHigherVoltageorCurrentAbstract:TechniquestoamplifythecurrentandvoltagedrivecapabilitiesoftheMAX7219andMAX7221serialinterfaceLEDdrivers.TheMAX7219/7221isan8-digit,7-segmentcommon-cathodemultiplexedLEDdisplaydriverwhichdrivesupto40mAsegmentcurrentwhileoperatingfroma4Vto5.5Vsupply.ThisapplicationnotediscusseshowtheMAX7219/7221canbeusedwithexternaldrivetransistorsforapplicationsrequiringhigherpeaksegmentcurrentsand/orahigherdrivevoltage.LEDsusingthreeormoreLEDdicepersegmentcannotbedrivendirectlybytheM