On Thu, 25 Mar 2010 16:21:03 -0700 (PDT), "mattschinkel" said:
> 
> >> However if I create a final product that has a 5v PIC/circuit, and I want
> >> others to be able to program this product via ICSP. Is it ok to directly
> >> connect this VDD to power supply 5v VDD on all programmers??
> 
> >Try and think if there are conditions where you would find the
> >connection was a bad idea.
> 
> I just think it is not good to connect ICSP VDD 5v to PSU 5v. There could
> be
> a voltage difference, ICSP VDD may be 4.7v, and PSU may be 5.2v. Isn't
> this
> a bad idea?

You are going to power both at the same time? Then don't worry.

Most programmers can tolerate excessive loading of the VDD pin, and you
should be prepared for the target board to take the load of the
programmer.

Cheerful regards,

Bob



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