Floating data interface
AssigneeDeutsche ITT Industries GmbH
InventorKlaus Heberle
Life of this patent
Estimating the term…
Abstract
A floating data interface, particularly for integrated circuits, is formed by a Hall-effect arrangement that includes a Hall-voltage-measuring device and a current-carrying coupling loop whose current is controlled by a data source. Because of the low internal resistance of the coupling loop, a plurality of such interfaces can be connected in series, and the individual circuits selected by addresses. Bidirectional data transfer via the floating interface is accomplished by an interrupter stage which interrupts the current flow on the bus line in an interrogation interval during one clock period and forces a predetermined mark/space ratio.
Claims10
An interface for controlling a first circuit from a second circuit wherein said second circuit operates from voltages that are not referenced to any voltage in said first circuit, comprising:
- a coupling loop connected to a bus line connected to said second circuit, said bus line having signals propagating as a current therein;
- and
- a Hall-voltage-measuring device positioned proximate to said coupling loop responsive to the current of said bus line by sensing the magnetic field of the coupling loop caused by said current, said Hall-voltage-measuring device generating an output signal that controls said first circuit, said output signal being referenced to a voltage of said first circuit and not being referenced to any voltage of said second circuit.
Dependencies are inferred from the claim text.