Single-Wire Serial Bus Carries Isolated Power and Data
Abstract:AninterfacecircuitusestheDallasSemiconductor1-Wireserialbustoprovideisolatedpowerandbidirectionalcommunicationsbetweenamaster(MCU)andasensingelement.Mar23,2006Abstract:AninterfacecircuitusestheDallasSemiconductor1-Wireserialbustoprovideisolatedpowerandbidirectionalcommunicationsbetweenamaster(MCU)andasensingelement.Medicalandindustrialapplicationsoftenrequiregalvanicisolationof2500VACorhigherforthesafetyofpatientsandequipmentoperators.Theisolationbarrierconveysnotonlypowertothesensingelement,butalsodatatoorfromthatelement.Eachdatasignalcrossingthebarrierrequiresisolation,soonetypicallysavescostsintheseapplicationsbychoosingaserialbusratherthanaparallelbus.SerialbusesincludeSPI,IC,andtheDallas1-Wirebus.TheDallasSemiconductor1-Wirerequiresonlyasingledataline(plusground)forbidirectionalcommunications.Becauseopto-isolators
