Why Termination resistance required in CAN?

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#1 21664095 11 Oct 2012 03:29

abhijeet Sathe abhijeet Sathe

Anonymous

Post #1
21664095 11 Oct 2012 03:29

Can anybody help me to get this.How the termination resistance value is fixed?
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#2 21664096 11 Oct 2012 14:08

Todd Hayden Todd Hayden

Anonymous

Post #2
21664096 11 Oct 2012 14:08

It is required to improve noise immunity along with the differential signaling. The value is determined by standards bodies where a wide variety of experienced people come toether and get agreement in tradeoffs of immunity improvement, bus length, power consumption, managing reflections, etc.
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#3 21664097 11 Oct 2012 23:43

abhijeet Sathe abhijeet Sathe

Anonymous

Post #3
21664097 11 Oct 2012 23:43

Thank you todd . but my question is why we require resistance? what if that resistor is not there?Is there any document do u have to get clear idea regarding this.
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#4 21664098 12 Oct 2012 05:53

David Adams David Adams

Anonymous

Post #4
21664098 12 Oct 2012 05:53

The terminatino resistance is based on the characteristic impedance of the transimssion line. When you use the proper valve it will prevent standing waves on the transmission line. These reflected waves create problems - can lead to component failure.

Try this link for more info

http://en.wikipedia.org/wiki/Electrical_termination
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#5 21664099 12 Oct 2012 08:34

Todd Hayden Todd Hayden

Anonymous

Post #5
21664099 12 Oct 2012 08:34

It is there to make the bus more robust. A given bus MAY work without it or it MAY NOT.

http://digital.ni.com/public.nsf/allkb/E64E8655D2B41DBA86256A530055E6BA
#6 21664100 13 Oct 2012 11:58

Mark Harrington Mark Harrington

Anonymous

Post #6
21664100 13 Oct 2012 11:58

If you unferstand how ethernet works you inderstand why you have to terminate can bus The clue is in the collision detection Think ethernet using co axial cable This will then makes sence Think also multiple access All nodes listen whilst any single node transmitts If you dont cap the line you risk nodes not being able to carry out error correction or retries
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Why Termination resistance required in CAN?

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