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PICList Thread
'In Circuit Programming Question'
1998\06\15@213142 by Lewis H. Cobb

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Greetings all -

I am crafting up a small PIC device that will run on a battery and am
wondering the following regarding the in circuit programming -

- If I do not have the battery installed in the unit when I program the pic -
 is the only extra "circuit" component needed, a small diode from VCC line
to MCLR on the processor to prevent the +12 programming voltage from
"wandering" elsewhere in the circuit?  I plan on using the PIcstart plus
programmer with a little cable and "jig" that I can load the boards into
for programming.  The picstart supplying VCC,GND,MCLR,RB7 and RB6

Thanks for any help people can provide.

Regards,

Lewis

1998\06\16@073141 by Caisson

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> Van: Lewis H. Cobb <spam_OUTcobbTakeThisOuTspamZEUS.EE.UNB.CA>
> Aan: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
> Onderwerp: Re: In Circuit Programming Question
> Datum: maandag 15 juni 1998 23:39
>
> Greetings all -
>
> I am crafting up a small PIC device that will run on a battery and am
> wondering the following regarding the in circuit programming -
>
> - If I do not have the battery installed in the unit when I program the
pic -
>   is the only extra "circuit" component needed, a small diode from VCC
line
> to MCLR on the processor to prevent the +12 programming voltage from
> "wandering" elsewhere in the circuit?

Resistors to keep the rest from your circuit from interfering with the
programming data (RB6 & RB7).  (ISP connections on the pins, resistors to
the rest of the circuit ...)

> I plan on using the Picstart plus
> programmer with a little cable and "jig" that I can load the boards into
> for programming.  The picstart supplying VCC,GND,MCLR,RB7 and RB6
>
> Thanks for any help people can provide.
>
> Regards,
>
> Lewis

Greetz,
 Rudy Wieser


'In Circuit Programming question'
1999\07\07@160040 by Dave Johnson
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I have a PIC project that I'd like to be able to program in-circuit, but
the problem is that the finished board will be *extremely* space
constrained, so there's no room for pin headers and such. I was thinking
that I could just have pads on the edge of the board, and rig up some
sort of clip to clamp on the edge of the board to program it, but I
thought I'd ask and see if anyone else has dealt with this before. Any
suggestions/advice appreciated.

Dave Johnson

1999\07\07@163207 by Harold Hallikainen

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       How about a DIP clip or something similar to just clip onto the
chip?

Harold


Harold Hallikainen
haroldspamKILLspamhallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

On Wed, 7 Jul 1999 12:58:55 -0700 Dave Johnson <.....djohnsonKILLspamspam.....SIRIUS.COM>
writes:
{Quote hidden}

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1999\07\07@171152 by Dave Johnson

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Harold Hallikainen wrote:

>How about a DIP clip or something similar to just clip onto the
>chip
I'm using the TQFP package for the PIC (tiny), and I haven't seen any
clips for that size. Perhaps they exist and I just haven't seen them?
Digikey doesn't have them, anyway.

Dave Johnson

1999\07\07@183312 by Eric Hufstedler

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I plan to do the same thing. I have the littl 8 pin smt pic.
My plan was to make a plastic part that will key on the package of the
pic and use spring loaded pins to connect to it.
Of course, it helps having a machine shop (i am doing this for work).

eric

On Wednesday, July 07, 1999 12:59 PM, Dave Johnson
[SMTP:EraseMEdjohnsonspam_OUTspamTakeThisOuTSIRIUS.COM] wrote:
> I have a PIC project that I'd like to be able to program in-circuit,
but
> the problem is that the finished board will be *extremely* space
> constrained, so there's no room for pin headers and such.

1999\07\07@202559 by Dave Johnson

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Eric Hufstedler wrote:

>I have the littl 8 pin smt pic.
>My plan was to make a plastic part that will key on the package of the
>pic and use spring loaded pins to connect to it.
If you're feeling lazy, you can buy clips for that package (SOIC, I'm
assuming) for a few bucks. Then again, makin' stuff in a machine shop is
its own reward...

But again, there are no such clips for a TQFP package, so I'm still
planning to put pads on the edge of the board, unless I hear a better
idea.

Dave Johnson

1999\07\07@210310 by Fredric White

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An HP wedge probe adapter might do the trick.  $40 a 3 pin version:

  http://www.tmo.hp.com/tmo/datasheets/English/HPE2613AWedge.html

[sorry if this appears twice]

1999\07\08@031121 by Michael Rigby-Jones

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You could use the spring loaded "pogo" pins normally used for Automatic PCB
testing in conjunction with a simple jig.  That's what we use here to setup
and test our product (with a PIC in it) and it works fine.

Regards

Mike Rigby-Jones

{Quote hidden}

1999\07\08@110409 by Jack Shidemantle

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I have done just as you suggested. I have a small SMT board 0.7" x 1.5"
using a 12C509, and other chips, with the programming connections coming
out to extra pads on the edge of the board. Works fine. Have processed
close to a hundred boards this way with no problems.

@
Sent by: pic microcontroller discussion list <KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU>
07/07/99 04:29 PM
Please respond to pic microcontroller discussion list

To: RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU
cc:
bcc:
Subject: Re: In Circuit Programming question


Ê Ê Ê ÊHow about a DIP clip or something similar to just clip onto the
chip?

Harold


Harold Hallikainen
spamBeGoneharoldspamBeGonespamhallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

On Wed, 7 Jul 1999 12:58:55 -0700 Dave Johnson <TakeThisOuTdjohnsonEraseMEspamspam_OUTSIRIUS.COM>
writes:
{Quote hidden}

___________________________________________________________________
Get the Internet just the way you want it.
Free software, free e-mail, and free Internet access for a month!
Try Juno Web: dl.http://www.juno.com/dynoget/tagj.

1999\07\08@115607 by Eric Hufstedler

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> If you're feeling lazy, you can buy clips for that package (SOIC, I'm
> assuming) for a few bucks. Then again, makin' stuff in a machine shop
is
> its own reward...

Makin it in the shop would be fun, but if they already exist, it'll be
better for me to just buy one.

Where can you get these?

Thanks,
eric

1999\07\09@171542 by Harrison Cooper

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My experience with TQFP clips....they work once or twice, but then it always
seems that they don't make very good contact with at least one or two pins.
For debugging these parts, I just solder wires to a header and tape it to
the board on top of a chip or what have you.

how about....pads, with individual staking pins, or just wires and clip
after?

-----Original Message-----
From: Dave Johnson [RemoveMEdjohnsonspamTakeThisOuTSIRIUS.COM]
Sent: Wednesday, July 07, 1999 3:12 PM
To: PICLISTEraseMEspam.....MITVMA.MIT.EDU
Subject: Re: In Circuit Programming question


Harold Hallikainen wrote:

>How about a DIP clip or something similar to just clip onto the
>chip
I'm using the TQFP package for the PIC (tiny), and I haven't seen any
clips for that size. Perhaps they exist and I just haven't seen them?
Digikey doesn't have them, anyway.

Dave Johnson

1999\07\09@173413 by Greg Wiley

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What if you take a small card-edge connecor
and saw slots in the sides so it fits over the
board?  I'm guessing this is a short-term con-
nection so lateral movement isn't a problem.
You could probably even trim the connector
down to the minimum required contacts.  I've
never done this so I don't know if the result
will retain its structural integrity but it might
be worth a try.

 -greg

1999\07\10@202404 by Glen

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dip clips are ideal.
you don't need much space around the pic.
its spring loaded so it just clips onto the pic pins.
has lugs at the top to solder wires to.
glen

Harold Hallikainen wrote:

{Quote hidden}

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