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'[EE]: What type of pogo pin?'
2007\03\21@005444 by Charles Craft

picon face
I'm tired of robbing old modems for RJ connectors or having to leave room
for a DIP clip when using a DIP chip. So maybe time for pogo pin ICSP setup.

Anyone have a favorite tip style?
Seems all these could be hard on the pads after many programming cycles.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260097135617

option 1 - 10 pieces P100-V-4R (crown tip) pogo pin & 1 piece 6-p 0.156" connector
option 2 - 10 pieces P100-B-4R (spear tip) pogo pin & 1 piece 6-p 0.156" connector
option 3 - 10 pieces P100-H20-7G (serrated tip) pogo pin & 1 piece 6-p 0.156" connector
option 4 - 10 pieces P100-K-4R (chisel tip) pogo pin & 1 piece 6-p 0.156" connector


2007\03\21@072324 by Gerhard Fiedler

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Charles Craft wrote:

> Anyone have a favorite tip style? Seems all these could be hard on the
> pads after many programming cycles.

We use them in a production setup, with spear tips for pads with plated
(but not soldered) holes, and with crown tips for pads that have a TH
component wire soldered.

For development, it's probably best to leave the board in the fixture while
you're working on it. When possible, I add a header to the board that we
don't populate for production.

Gerhard

2007\03\21@073426 by peter green

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face

> I'm tired of robbing old modems for RJ connectors or having to leave room
> for a DIP clip when using a DIP chip. So maybe time for pogo pin ICSP setup.
the impression i get is that pogo pins are great for production where you are programming lots of identical boards once but really not at all suited for development where you want to reprogram one board repeatedly or program lots of different boards.

one suggestion i've seen is to use some form of small surface mount connector for development then on production models don't populate it and use the pads it sat on for pogo pin programming..  


2007\03\21@080749 by wouter van ooijen

face picon face
> > I'm tired of robbing old modems for RJ connectors or having
> to leave
> > room for a DIP clip when using a DIP chip. So maybe time
> for pogo pin
> > ICSP setup.

Maybe consider either a SOIC chip + SOIC clip, or SOIC clip + 5-pin
header? I think either should take up less PCB area that a DIP chip.
Another approach I like is a 'DIP riser', easily made from a bunch of
round-pin sockets (or one round-pin socket and one wire-wrap-socket) or
a DIP/bandcable connector (but that can give problems with capacity on
the clock pins).

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu



2007\03\21@082420 by Alan B. Pearce

face picon face
>one suggestion i've seen is to use some form of small surface
>mount connector for development then on production models don't
>populate it and use the pads it sat on for pogo pin programming..

One possibility I am looking at is to have the plug as part of the PCB, just
like an edge connector without gold plating, so that it will plug into an RJ
socket. The socket will need to have packing to make up the thickness of a
normal RJ plug, and the PCB may need sluts to accommodate the sides of the
socket to help keep it all aligned, but the slots could be minimised by
cutting out a significant portion of the sides of the RJ socket.

I was envisaging using a telephone cable socket-socket joiner for making
long extension cables out of two short ones as the sacrificial socket that
gets hacked.

Then with this arrangement you end up with some 50 thou wide 50 thou space
tracks that mate with the RJ socket or could be contact points in a jig for
pogo pins. The tracks do need to be about 5mm long so pogo pins could be
staggered in a jig.

2007\03\21@084750 by Jinx

face picon face
> the PCB may need sluts to accommodate the sides of the socket

Wow, that's some PCB editor you've got. Eagle hasn't got anything
like that ........ but that's freeware for you

2007\03\21@085119 by Bob Axtell

face picon face
Charles Craft wrote:
> I'm tired of robbing old modems for RJ connectors or having to leave room
> for a DIP clip when using a DIP chip. So maybe time for pogo pin ICSP setup.
>
> Anyone have a favorite tip style?
> Seems all these could be hard on the pads after many programming cycles.
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260097135617
>
> option 1 - 10 pieces P100-V-4R (crown tip) pogo pin & 1 piece 6-p 0.156" connector
> option 2 - 10 pieces P100-B-4R (spear tip) pogo pin & 1 piece 6-p 0.156" connector
> option 3 - 10 pieces P100-H20-7G (serrated tip) pogo pin & 1 piece 6-p 0.156" connector
> option 4 - 10 pieces P100-K-4R (chisel tip) pogo pin & 1 piece 6-p 0.156" connector
>
>
>  
I like the chisel tip, and I use 0.028" holes in my target pad. This
keeps the pogo pin from roaming around. It assures
smooth one-handed operation.

You WONT be disappointed. This scheme really works well.

--Bob

2007\03\21@085233 by peter green

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face
> One possibility I am looking at is to have the plug as part of
> the PCB, just
> like an edge connector without gold plating, so that it will plug
> into an RJ
> socket. The socket will need to have packing to make up the
> thickness of a
> normal RJ plug, and the PCB may need sluts to accommodate the
> sides of the
> socket to help keep it all aligned, but the slots could be minimised by
> cutting out a significant portion of the sides of the RJ socket.
edge connectors are gold plated for a reason. I certainly wouldn't imagine a non plated one that was almost never used would work very well if you tried to use it for a field reprogram a while after the board was made especilly if it was mating with an RJ jack rather than a proper edge connector.

and cutting those slots may well have a cost attatched.

for development and emergency field reprogramming it seems so much easier to just solder down a normal connector (be it a RJ, a pin header or something smaller) and plug your prorgrammer straight in , they aren't hugely expensive.





2007\03\21@085955 by Alan B. Pearce

face picon face
>> the PCB may need sluts to accommodate the sides of the socket
>
>Wow, that's some PCB editor you've got. Eagle hasn't got
>anything like that ........ but that's freeware for you

Whoops, didn't pick that one up on the spell checker ...

Don't use Eagle, use Or****Cad here ... ;))

2007\03\21@101042 by Charles Craft

picon face
Thanks Bob.
I was thinking flat pads like a JTAG port in a dish receiver but
the chisel point with pad holes makes a lot of sense. Thanks!

And who knew that the PIClist could have helped me with my love life.
Years ago before I was married that is. (gotta check that Orcad brochure)  :-)

{Original Message removed}

2007\03\21@103446 by David VanHorn

picon face
On 3/21/07, Alan B. Pearce <spam_OUTA.B.PearceTakeThisOuTspamrl.ac.uk> wrote:
>
> >> the PCB may need sluts to accommodate the sides of the socket
> >
> >Wow, that's some PCB editor you've got. Eagle hasn't got
> >anything like that ........ but that's freeware for you
>
> Whoops, didn't pick that one up on the spell checker ...
>
> Don't use Eagle, use Or****Cad here ... ;))


We keep telling you guys orcad is more fun, but do you listen?  NOOOOooooo!

:)

2007\03\21@153107 by Andre Abelian

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face
Orcad schematic is great but not PCB.

Andre



-----Original Message-----
From: .....piclist-bouncesKILLspamspam@spam@mit.edu [piclist-bouncesspamKILLspammit.edu]On Behalf
Of David VanHorn
Sent: Wednesday, March 21, 2007 7:31 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE]: What type of pogo pin?


On 3/21/07, Alan B. Pearce <.....A.B.PearceKILLspamspam.....rl.ac.uk> wrote:
{Quote hidden}

We keep telling you guys orcad is more fun, but do you listen?  NOOOOooooo!

:)

2007\03\21@165538 by David VanHorn

picon face
On 3/21/07, Andre Abelian <EraseMEaabelianspam_OUTspamTakeThisOuTmason-electric.com> wrote:
>
> Orcad schematic is great but not PCB.


Just to be clear, the windows product, "layout" is abysmal.
The old dos product, PCB386 is quite good.  I run a yahoo group for this,
and we have a constant stream of new members who are giving up on "modern"
packages for our 13 years obsolete dos favorite.

Traceback's new video drivers are a big help, and there are other
developments in progress.

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