Re: PicKit 2 WARNING

Spehro Pefhany wrote:
On Thu, 17 Sep 2009 00:39:09 -0700, Robert Baer
<robertbaer@xxxxxxxxxxxx> wrote:

Spehro Pefhany wrote:
On Wed, 16 Sep 2009 11:11:27 -0700, Robert Baer
<robertbaer@xxxxxxxxxxxx> wrote:

Spehro Pefhany wrote:
On Tue, 15 Sep 2009 23:25:58 -0700, the renowned Robert Baer
<robertbaer@xxxxxxxxxxxx> wrote:

David L. Jones wrote:
Robert Baer wrote:
David L. Jones wrote:
Frank Buss wrote:
David L. Jones wrote:

Robert Baer wrote:
You can permanently destroy a PicKit 2 programming pod in an
easy un-documented manner.
1) Tie one or more pins of a PIC MCU to ground; it does not help
to have MCU program use the pin(s) as inputs.
2) Program then power up the MCU with the PicKit 2; you may need
to do power down and power up a few times.
ZZZZzzzzzaaaaaa:P:! No Poof, No Frap, No Zap; it just gets
killed. As far as i can tell the USP port is not damaged; my
1Gbyte stick still reads OK.
I have no such problems with this test setup:

http://www.frank-buss.de/pic18f2550/index.html

The PIC is always powered from external power in my test setup. But
I noticed that the PicKit pulls VDD to low, if disabled, which was
not much of a problem, because of my current limited power supply,
but I think this could destroy the prorgammer.
It can only pull VDD low with a 1K in series, so that isn't going to
destroy the programmer.
www.modtronix.com/products/prog/pickit2/pickit2%20data***.pdf

Err, yes they are, at $35 it's one of the cheapest official
programmers on the market for any micro.
There are some other programmers within the same price range:

http://search.digikey.com/scripts/DkSearch/dksus.dll?keywords=428-2021-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?keywords=336-1182-ND

But you are right, there are more expensive ones, but then usually
with in-circuit debugging support etc.
The PICkit2 has in-circuit debugging capability, stand-alone field
programming support, and can power your circuit under test with any
voltage from 2.8V to 5V. And as a bonus can be used as a 4 logic
analyser and serial protocol analyser too. Pretty good value for
money! Dave.

There was NO (1K) "protection" resistor (8 lines) from MCU to
ground; at worst 2 pins were shorted.
Huh?
I'm refering to Frank comment about the PICkit2 circuit and it's ability to pull the VDD pin LOW.
According to the schematic for the PICkit2 it's got a 1K series resistor in there for that.

Dave.

There is an *actual* (and correct) schematic for the PicKit-2 programming pod?
Where, oh where pray tell?
User's Guide, Appendix A.


Best regards, Spehro Pefhany
IFFI (eg: if and only if) the appendix exists.
It did with the reference given earlier in this thread.
Ahem. A quick search with Google found documents DS51553A, DS51553B,
DS51553C, DS51553D AND DS51553E. That's five revisions of the User's
Manual and ALL of them have the schematic near the end. It's grown
from 30-odd pages at the beginning to about 86 pages currently:

http://ww1.microchip.com/downloads/en/DeviceDoc/51553E.pdf



But of course!
Everything i had until recently was a few-page PDF and ZERO hint of a schematic for the pod - and ALL other PDF's that EVERY ONE ELSE had were complete and perfect.
And i bet EVERY ONE else has a perfect version of the ZIP that failed on me.
Standard operating BS.
If you want guaranteed trading profits, then give me some money and make all of your trades opposite of ANYTHING i do in trading; it will not matter if everything i trade for gains goes up or trade for losses goes down.
I would almost always lose and your "contrarian" (WRT my) trades would gain.

LOL. Hang in there Robert. But I'd sure suggest getting onto broadband
as soon as possible.

I think you have to expect development tool hardware to go bad once in
a while. There are just too many opportunties for damage.. cost of
doing business. Anyway, I think uChip will replace or repair dev tools
for free (maybe you have to send the old one back first and wait a
bit). They certainly do so for Design House clients such as myself,
and they do it very promptly without undue questions which might
embarass the poor jr. engineer who blew it up.

I agree that getting high speed internet would be "very nice".
BUT.
1) Too expensive for me (a) DSL is an added $30+ per month not including undisclosed fees and taxes, (b) cable ditto, and (c) Clear rates are now in the same ballpark with the additional problem that a usable signal is at least 100 feet away from any window i might be able to use, (d) satellite dish is in the $600 per month region and less reliable than using a drum.
The undisclosed fees and taxes are at least 50 percent more than the advertised rate.
If the cost was $20 per month *TOTAL* i might be able to squeak by.
.

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