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Galvanic isolation of IEEE 1394-1995 serial bus

Posted: 25 Apr 2001     Print Version  Bookmark and Share

Keywords:IEEE 1394-1995  galvanically isolated 

The IEEE 1394-1995 cable is designed to transmit and receive data at various data rates and to also source and/or sink power to/from remote nodes. This allows remote nodes that either do not have their own source of power or have their power turned off to continue to function in the IEEE 1394-1995 network. The signalling in 1394 requires that every physical layer on a bus be operating at the same ground potential. In a 1394-1995 system, this is accomplished by connecting all physical layer grounds together using the 1394 cable logic ground (the ground wire of the cable power and ground pair). Because all nodes are connected together, this has the potential to form ground loops when not galvanically isolated. Also, since multiple nodes connected together are allowed to source power simultaneously, grounding problems are created in the system when galvanic isolation between nodes is not handled properly.

This application report describes the three isolation requirements set forth in IEEE 1394-1995 for: Shield termination; cable power isolation; and signal isolation. All three of these requirements must be met to ensure isolation.The majority of this application report is dedicated to describing the Texas Instruments patent-pending signal isolation method.

View the PDF document for more information.

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