Method and apparatus for CAN bus auto-termination
First Claim
Patent Images
1. A CAN bus termination circuit, comprising:
- a cable detection input pin, a switch and a termination resistance operably coupled to detect the presence and absence of one or more cables and to automatically anable and disable the termination resistance to the one or more cables in response thereto.
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Accused Products
Abstract
A cable area network (CAN) bus termination (100) is provided by an interface 104 operably coupling a cable detection input pin (3), a switch (120) and a termination resistance (130) to detect the presence and absence of one or more cables (108). The termination resistance (130) is automatically enabled to create terminations at end nodes and is automatically disabled to provide a daisy-chain connection between interim nodes of a multi-cable system.
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Citations
17 Claims
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1. A CAN bus termination circuit, comprising:
a cable detection input pin, a switch and a termination resistance operably coupled to detect the presence and absence of one or more cables and to automatically anable and disable the termination resistance to the one or more cables in response thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cable area network (CAN) bus termination, comprising:
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an interface for receiving at least one cable connector; a circuit coupled to the interface; and the circuit automatically providing a resistive termination by default in the absence of a cable connect or being coupled to the interface, and the circuit automatically providing a resistive termination in response to a single cable connector being coupled to the interface, and the circuit automatically providing a series connection between two connectors being coupled to the interface, wherein the interface comprises a single interface for receiving a Y-split cable. - View Dependent Claims (9, 10)
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11. A cable area network (CAN) bus termination, comprising:
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an interface for receiving at least one cable connector; a circuit coupled to the interface; and the circuit automatically providing a resistive termination by default in the absence of a cable connect or being coupled to the interface, and the circuit automatically providing a resistive termination in response to a single cable connector being coupled to the interface, and the circuit automatically providing a series connection between two connectors being coupled to the interface, wherein the interface comprises first and second interface portions for receiving connectors of two straight cables.
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12. A cable area network (CAN) bus termination circuit, comprising:
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first and second interfaces for receiving a least one cable connector; a switch coupled to the first and second interfaces; and a termination resistance being selectively controlled by the switch so as to couple to the first and second interfaces when one cable connector is attached to one of the first and second interfaces, and the termination resistance being disabled by the switch when two cable connectors are coupled to the first and second interfaces.
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13. A communication system, comprising:
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a plurality of cable area network (CAN) components; a plurality of cables daisy-chaining the plurality of CAN components such that two end nodes are separated by a plurality of interim nodes, the plurality of cables being provided with terminations by an electrical switching circuit that automatically enables termination resistances to the two end nodes while disabling termination resistances to the interim nodes, wherein the electrical switching circuit includes a cable detection pin. - View Dependent Claims (14, 15)
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16. A communication system, comprising:
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a plurality of cable area network (CAN) components; a plurality of cables daisy-chaining the plurality of CAN components such that two end nodes are separated by a plurality of interim nodes, the plurality of cables being provided with terminations by an electrical switching circuit that automatically enables termination resistances to the two end nodes while disabling termination resistances to the interim nodes, wherein the two end nodes require no information from any of the interim nodes.
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17. A communication system, comprising:
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a plurality of cable area network (CAN) components; a plurality of cables daisy-chaining the plurality of CAN components such that two end nodes are separated by a plurality of interim nodes, the plurality of cables being provided with terminations by an electrical switching circuit that automatically enables termination resistances to the two end nodes while disabling termination resistances to the interim nodes, wherein the two end nodes are provided with termination resistances without sensing any activity of the interim nodes.
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Specification