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'[PIC] Re: Cranky ICD2, signal conditioning?'
2006\10\03@223518 by Bob Axtell

face picon face
(Add PIC header, otherwise many people will not get your message).

The only thing that grabs me is that 20" is LONG for the ICD2 cable.
I'd suggest dropping it to 6" or less. Mine are about 5" long nominally.

I also have had ground problems caused by the fact that the ICD2 uses such
tiny wires in its RJ12 connector; try soldering a #22 or heavier jumper
to your
development PCB and solder the other end to the ICD2. For convenience, you
can solder the GND to the metal of the USB B cable, it works good.

Make sure that the MPLAB PC and the development  PCB both use the SAME
AC Mains  branch, and ideally are on the same "power strip".

I have detected some USB issues, which seem to be eliminated when the
Cypress chip
is not used. I prefer Kenny Wong's ICD2 USB clone to Microchip's; it
uses a good ole
PIC chip instead of the Cypress. It also has a better connector (5-pin
0.1" header) and
actually uses USB 5V (optional jumper) to assist in powering the unit.
It also includes a
40P ZIF programming station at no extra cost. Yet, it costs 50% of the
Microchip cost.
Look on EBAY for this unit, "FULL USB ICD2" or something like it.
Shipping is only
$12 USD.

--Bob

Barry Gershenfeld wrote:
{Quote hidden}

2006\10\04@163519 by Barry Gershenfeld

face picon face
At 07:35 PM 10/3/06 -0700, Bob Axtell wrote:
>(Add PIC header, otherwise many people will not get your message).

I *wondered* why I couldn't find my original message!   90% of my posts are
replies so I don't think about the header.

>The only thing that grabs me is that 20" is LONG for the ICD2 cable.
>I'd suggest dropping it to 6" or less. Mine are about 5" long nominally.

I'll try it, if I can't remedy it otherwise.  The signals look pretty good
though and I would think they'd be OK with some cleanup.  Of course, the
shorter wire wouldn't produce this in the first place.   The long wire is a
convenience thing, of course.

>I also have had ground problems caused by the fact that the ICD2 uses such
>tiny wires in its RJ12 connector; try soldering a #22 or heavier jumper
>to your development PCB and solder the other end to the ICD2. For
>convenience, you
>can solder the GND to the metal of the USB B cable, it works good.

Been there, done that, have the clip leads. It's not just the wires but
some of the connectors in between.  I have one application where the power
supply feeds the ICD, the ICD feeds the logic board, and then the logic
board feeds a display board with LCD and some appreciable mA of LED
backlight.  That one really needed it.  I left this off the list because I
didn't actually try it.  But, I will, for completeness.  But here the
target has its own power...

>Make sure that the MPLAB PC and the development  PCB both use the SAME
>AC Mains  branch, and ideally are on the same "power strip".

I won't ask you how you knew this.

>I have detected some USB issues, which seem to be eliminated when the
>Cypress chip is not used. I prefer Kenny Wong's ICD2 USB clone . . .[etc]

Oh thanks a lot...now I'm going to think the ICD2's will never work...and
we can't trade notes anymore... :-)

Thanks for responding.

Barry



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