Communication interface for galvanic isolation
AssigneeNXP B.V.
InventorRemco Van de Beek
Life of this patent
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Abstract
In one or more embodiments, a system is provided for communicating between different voltage domains using N+1 capacitive-coupled conductive lines to provide N communication channels. For instance, bi-directional communication (e.g., a first communication in a first direction and a second communication path in the opposite direction) may be provided using three capacitive-coupled signal paths. Two of the signal paths are used as single-ended (i.e., non-differential) signal paths. The third signal path is used to suppress voltage disturbances between two voltage domains.
Claims19
A device configured for use with a plurality of signal paths providing capacitive isolation between devices communicating over the signal paths and comprising:
- a receiver circuit configured and arranged to receive signal data over a first path of the plurality of signal paths;
- a transmitter circuit configured and arranged to transmit signal data over a second path of the plurality of signal paths;
- and
- a compensation circuit configured and arranged to, in response to detecting ground transient on a third signal path:
- generate a compensation signal configured to compensate for ground transient voltage from signal data carried on the third signal path;
- and
- transmit the compensation signal over the first path of the plurality of signal paths to compensate for ground transient voltage from signal data carried on the first path.
A communication system, comprising:
- first and second single-ended signal lines;
- and
- a communication device connected to the first and second signal lines and configured and arranged to:
- receive and decode signals from the first single-ended signal line;
- detect ground transients on the second single-ended signal line;
- based on voltage of the second single-ended signal line, generate a first compensation signal configured to compensate for the ground transients on the second single-ended signal line;
- and
- transmit a second compensation signal, equal to the first compensation signal, on the first single-ended signal line.
Dependencies are inferred from the claim text.