A sensor system or a sensor bus comprises a plurality of sensors coupled together by a bus to a controller for sensing physical parameters and responding to changes of the physical parameters. The bus comprises a two wire bus, with a first wire and a second wire, configured to communicate supply signals to the plurality of sensors and data communication signals generated by current modulate signals from the plurality of sensors or the controller. The plurality of sensors and the controller comprise variable current sources. The variable current sources of the sensors generate data communication signals in a first frequency range, while the variable currents sources of the controller and sensors regulate the supply signals from the bus in a different frequency range. A termination network having termination, dividers at both ends of the bus, match the load impedances and the line impedances of the bus within the first frequency range, which is about five to ten times larger than the second frequency range.
Current Loop Sensor Interface Using a Terminated Symmetrical Physical Layer
2017-02-23
Patent
Elektronische Ressource
Englisch
IPC: | B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G07C TIME OR ATTENDANCE REGISTERS , Zeit- oder Anwesenheitskontrollgeräte / H03H IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS , Scheinwiderstandsnetzwerke, z.B. Resonanzkreise |
Current loop sensor interface using a terminated symmetrical physical layer
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