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elongating the ICD cable.

 
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treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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elongating the ICD cable.
PostPosted: Mon May 22, 2006 11:39 am     Reply with quote

Has anyone come up with a trick where I can elongate the ICD-U40 cable.

For a while now I have been using a 2.5foot ribbon cable.(nice and flexible)

but now all of a sudden its started failing. I shortened it up to 8" and now all is well. I just wonder if a resistor in the right place would allow me the longer
cable again.

Come to think of it.. While it WAS working the ICD was also used by the keypad port with 10k pull-ups. I have to look into this...
Konrad



Joined: 15 Sep 2003
Posts: 34

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add filter caps?
PostPosted: Mon May 22, 2006 4:50 pm     Reply with quote

I have just started messing with a dsPIC. On the Microchip forum people recommend adding 100pF caps to the prog and data lines to stop crosstalk. They even meantion problems with some 18F parts. Myself I have never had a problem, but it may help with longer cables. The caps need to be at the target end.
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Tue May 23, 2006 6:28 am     Reply with quote

Too much capacitance will also cause you problems as well as resistance. It will affect the rise and fall times of the data signals.
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