简单的逻辑电平转换接口1.8V的微控制器和3V外设

摘要：一个3V外设接口1.8V的微控制器，构成了设计上的挑战，因为微控制器的逻辑输出不能满足外围设备的VIH和VIL要求。需要使用一个逻辑电平转换接口的两个设备。接口电路，可以组成一个简单的电阻和二极管或集成逻辑电平转换。Maxim>AppNotes>AUDIOCIRCUITSKeywords:interfacing,interface,leveltranslator,1.8Vto3V,logiclevel,microcontroller,microcontrollerMay11,2005APPLICATIONNOTE3498SimpleLogic-LevelTranslationInterfaces1.8VMicrocontrollersand3VPeripheralsAbstract:Interfacinga1.8Vmicrocontrollertoa3Vperipheralposesadesignchallenge,becausethelogicoutputofthemicrocontrollercannotsatisfytheperipheral'sVIHandVILrequirements.Alogic-leveltranslatorneedstobeusedtointerfacethetwodevices.Theinterfacecircuitcanconsistofasimpleresistoranddiodeoranintegratedlogic-leveltranslator.Microcontrollers(Cs)poweredfrom1.8VcannotmeettheVIHrequirementsofperipheraldevicesthathavetypicalCMOSinputsandarepoweredfrom3V.Genera