I have a bus, with say 10 tri-state drivers attached to it. Only one of them is active at one time.

I need to know if I need to terminate this bus at both ends? You can imagine the bus is a horizontal wire with taps at various points.

If both ends float, there will be reflections. If one end is terminated, I assume the other end will reflect.

So must I terminate both ends of this bus?

Thank you!

 

hi ADD,
Look thru this guide link.
http://www.ni.com/white-paper/9759/en/

E

 

hi ADD,
Look thru this guide link.
http://www.ni.com/white-paper/9759/en/

E

I'm not using the CAN bus eric....

 

OK, what are the details of your Bus signals etc.?

http://www.analog.com/media/en/training-seminars/tutorials/MT-097.pdf

 

OK, what are the details of your Bus signals etc.?

http://www.analog.com/media/en/training-seminars/tutorials/MT-097.pdf

Figure 8 on your PDF shows what I was referring to.

The bus is terminated at both ends.

Is that the way to do it?

My signals are just CMOS 5V. Various tristated devices outputting into a single receiver.

 

What I want to know is if I need to put term. resistors at both ends.

If you imagine a floating end, a signal of 5V will reflect as 10V from the open end into the rest of the bus, and drive my receiver into 10.

If my receiver was previously parallel terminated,it would first see 5V, and then the 10V wave arrives and it goes to 10V.

So if I terminate both ends, then both ends will rise and stay at 5V.

I need confirmation of this

 

hi,
I would terminate at both ends if the interconnected devices are widely separated.
The Bus termination pull ups will be at both ends of the lines, ensure that you do exceed the limitations of the Bus driver IC's

EDIT:
This PDF link will advise.
https://www.fairchildsemi.com/application-notes/AN/AN-610.pdf

 

EDIT:
This PDF link will advise.
https://www.fairchildsemi.com/application-notes/AN/AN-610.pdf[/QUOTE]


Hello

 

hi,
Do you have a question.?

 

Yes sir

 

Please ask your question
E

 

Hi ADD,
This PDF gives design information for Bus drivers.
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Hi ADD,
This PDF gives design information for Bus drivers.
E

Not quite sure about that

 

hi ADD,
If you could be more specific with your query, it makes it more possible to help you.
What are you not sure about.?
E