CAN bus termination circuits and CAN bus auto-termination methods
AssigneeHewlett-Packard Company
InventorRicardo Osuna Leyva
Life of this patent
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Abstract
CAN bus termination circuits, and CAN bus auto-termination methods are described. In one embodiment, a CAN bus termination circuit includes a first circuit in electrical communication with a CAN bus. The first circuit is configured to monitor an electrical operating parameter associated with operation of the CAN bus. A second circuit is in electrical communication with the first circuit, and is selectively enabled by the first circuit responsive to the first circuit's sensing a change in the electrical operating parameter that it is configured to monitor. When enabled, the second circuit terminates the CAN bus.
Claims19
A CAN bus termination circuit comprising:
- a first circuit in electrical communication with a CAN bus and configured to monitor an electrical operating parameter associated with operation of the CAN bus, the electrical operating parameter being associated with whether or not a power on signal has been generated by one node connected with the CAN bus for a next-in-line node connected with the CAN bus;
- and
- a second circuit in electrical communication with the first circuit, the second circuit being selectively enabled by the first circuit responsive to the first circuit's sensing a change in the electrical operating parameter that it is configured to monitor, the second circuit being configured to terminate the CAN bus when it is enabled.
A CAN bus system comprising:
- a CAN bus;
- a plurality of nodes distributed along and operably connected with the CAN bus;
- a power-on signal generation circuit having an output line that is coupled with the plurality of nodes and configured to enable the nodes;
- and
- for each node:
- a termination circuit connected to the output line and being configured to monitor for whether one node on the CAN bus has enabled a next-in-line node on the CAN bus, and responsive to sensing that the one node has not enabled the next-in-line node, terminate the CAN bus.
A CAN bus auto-termination method comprising:
- monitoring an electrical operating parameter associated with operation of at least one CAN bus node of a CAN bus, said electrical operating parameter being associated with whether the one CAN bus node has generated a signal that enables a next-in-line CAN bus node;
- and
- terminating the CAN bus, responsive to the one CAN bus node not generating a signal that enables the next-in-line CAN bus node.
Dependencies are inferred from the claim text.