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'[PIC:] Programming SOIC chips before soldering'
2004\03\17@050213 by Ben Hencke

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Hi all,
I am in the process of switching to SMT parts to save
on endless drilling for a run of devices (100+) and to
further reduce the size of the device. I am working
with 12f629s, so its only a 8 pin SOIC, but I need a
way to program the buggers before I solder them in the
circuit. ICSP is not really an option because of the
size and compactness of the device (even bare board).
There is definitly no room for headers.

Is there any kind of socket or clip or something I can
use to connect to the bare SOICs long enough to
program and verify them? The only thing I have found
is for DIPs.

Any experiences with this is apreciated :-)

TIA,
 Ben Hencke


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2004\03\17@052042 by Spehro Pefhany

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At 02:00 AM 3/17/2004 -0800, you wrote:
>Hi all,
>I am in the process of switching to SMT parts to save
>on endless drilling for a run of devices (100+) and to
>further reduce the size of the device. I am working
>with 12f629s, so its only a 8 pin SOIC, but I need a
>way to program the buggers before I solder them in the
>circuit. ICSP is not really an option because of the
>size and compactness of the device (even bare board).
>There is definitly no room for headers.
>
>Is there any kind of socket or clip or something I can
>use to connect to the bare SOICs long enough to
>program and verify them? The only thing I have found
>is for DIPs.
>
>Any experiences with this is apreciated :-)

You can get programming sockets for them, and wire your own adapter.
They are not cheap.

http://yamaichi.us.phtemp.com/pdf/t&b/ic51_sop.pdf


Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2004\03\17@053118 by Chris Emerson

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face
On Wed, Mar 17, 2004 at 02:00:52AM -0800, Ben Hencke wrote:
> Is there any kind of socket or clip or something I can
> use to connect to the bare SOICs long enough to
> program and verify them? The only thing I have found
> is for DIPs.

Would a SOIC clip like the following be any good?

http://uk.farnell.com/jsp/catalog/viewproductdetails.jsp?prodId=178278

You'd have to solder the chip first though, and probably before other
parts nearby if it's cramped, so may not be suitable.

Not tried it myself, just came across it while looking for DIP clips.

Chris

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2004\03\17@053532 by Mike Harrison

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On Wed, 17 Mar 2004 02:00:52 -0800, you wrote:

>Hi all,
>I am in the process of switching to SMT parts to save
>on endless drilling for a run of devices (100+) and to
>further reduce the size of the device. I am working
>with 12f629s, so its only a 8 pin SOIC, but I need a
>way to program the buggers before I solder them in the
>circuit. ICSP is not really an option because of the
>size and compactness of the device (even bare board).
>There is definitly no room for headers.
>
>Is there any kind of socket or clip or something I can
>use to connect to the bare SOICs long enough to
>program and verify them? The only thing I have found
>is for DIPs.
>
>Any experiences with this is apreciated :-)
>
>TIA,
>  Ben Hencke
You can get SOIC test clips - 3M do one (923650-08)- not hugely expensive - about $15-20
Look at order code 178-278 at http://www.farnell.com/uk




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2004\03\17@055026 by Wouter van Ooijen

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> Is there any kind of socket or clip or something I can
> use to connect to the bare SOICs long enough to
> program and verify them? The only thing I have found
> is for DIPs.

A soic test clip. Last time I went to the local elctronics shop I wanted
to buy some 8-pin dip clips, but they sold me 8-pin soic clips for the
same price. I did not object :)

Wouter van Ooijen

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2004\03\17@080343 by SM Ling

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>You can get SOIC test clips - 3M do one (923650-08)- not hugely expensive -
about $15-20
Look at order code 178-278 at http://www.farnell.com/uk

Pomona quality is much better.

Cheers, Ling SM

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2004\03\17@084329 by al smith

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Depends on what your willing to pay....because there are services that can
and will program these for you.  Check with Arrow Electronics or your local
distributor and see what they can do for you.


{Quote hidden}

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2004\03\17@090833 by Jim Monteith

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I use the 12F675 for a product we manufacture.  We solder the chip on empty,
but along the edge of the board there are "touch points" where spring loaded
pins attached to the ICSP make contact.  We've programmed thousands this
way.  Our board is only an inch square, there is no header, and the process
has proven to be very effective.

Let me know if you would like more specific information.

Jim

{Original Message removed}

2004\03\17@093942 by Anthony Van Herrewege

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Sure they exist, for soic, for dip, for ...
I found a site where they sell them yesterday, but I
can't find them anymore.
However, I did a quick seach on RS-Components.be (the
American site didn't seem to have them?) and they have
lots of them.

Anthony

--- Ben Hencke <EraseMEsimap2000spam_OUTspamTakeThisOuTYAHOO.COM> wrote:
{Quote hidden}

=====
Website: http://members.lycos.nl/anthonyvh


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2004\03\17@095019 by Denny Esterline
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Right on time guys, I'll have to solve this problem next week.

Looks like digikey has the 3M test clips, P/N 923655-08-ND for gold plated
8 pin http://dkc3.digikey.com/PDF/T041/0279.pdf for the catalog page.

Looks like the gold contacts are less than a buck more than the tin.

Originally I was planning to solder down the chip and before any other
parts are mounted, program in a fixture with some spring loaded pins
contacting the open pads of the other parts, but this looks better.

-Denny


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2004\03\17@142901 by Ben Hencke

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--- Mike Harrison <mikespamspam_OUTWHITEWING.CO.UK> wrote:
> You can get SOIC test clips - 3M do one (923650-08)-
> not hugely expensive - about $15-20
> Look at order code 178-278 at http://www.farnell.com/uk

Exactly what I was looking for, but somehow managed to
miss!

Its only $11 at mouser too. :-)

Thanks,
 Ben Hencke


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2004\03\17@164235 by John N. Power

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{Quote hidden}

If you are willing to make your own, consider this:
The pitch on an 8 pin SOIC is 0.050" (spacing
between adjacent pins). This is also the spacing
of conductors in mass-termination cable (Ansley,
3M, etc.) With only 8 pins to connect, you could
take two pieces with 4 wires each, and strip back
the insulation 1/16" on each conductor. Fasten
each group of 4 wires to the edge of an insulated
support and press each support against the chip
leads from opposite sides.
1. Tin each exposed wire end to reduce problems
  from stray whiskers (strands)
2. If the leads are gull-wing type (usual on SOIC)
 arrange the plane of the leads parallel to the
 top of the chip package and press the leads
 down onto the horizontal part of the pins.
3. With J-type leads (rare), mount the supports
 perpendicular to the top of the chip and press
 them in from the sides.

With more than 8 leads, this might be more trouble
than it is worth, but only 8 should be easy.

John Power

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2004\03\17@175000 by Ben Hencke

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--- Jim Monteith <RemoveMEjimmTakeThisOuTspamSERVICEMATE.COM> wrote:
> I use the 12F675 for a product we manufacture.  We
> solder the chip on empty,
> but along the edge of the board there are "touch
> points" where spring loaded
> pins attached to the ICSP make contact.  We've
> programmed thousands this
> way.  Our board is only an inch square, there is no
> header, and the process
> has proven to be very effective.
>
> Let me know if you would like more specific
> information.
>
> Jim

I had tried something similar. The board is 2" x 1/2"
but the PIC connections are crammed up near one end in
about 1/2" square with no room to spare for a well
layed out contact area. I had tried attaching several
clips to various parts of the board, but that would be
too slow. Fear of the Vpp clip slipping and shorting
to something was also on my mind ;-)

I think I can use one of the recommended SOIC clips
(exactly what I was looking for) to program the chip.

Thanks for all the help & suggestions,
 Ben Hencke

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2004\03\17@192655 by redtock8

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Jim,
I would like to do this. Where do you get spring loaded
pins etc? Could you provide more info on how to do this?

Albert

spamBeGoneredrock8spamBeGonespamalltel.net

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2004\03\18@122452 by Paul Hutchinson

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I use this brand of spring contact probes:
http://www.idinet.com/

Paul

{Quote hidden}

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