And where do you get pogo pins ?
Thanks
Cedric


On Feb 11, 2008, at 5:19 PM, Bob Axtell wrote:

msi1259 wrote:
> I've searched the archives on doing ICSP using pogo pins, and am now
> unclearer on exactly how it is done. Are through-holes used to land  
> the
> pins on the preferred method?   Is a pc board made up to match the  
> holes
> (or chip pins) to hold the pogo pins? What holds the assembly down
> during programming?  Are adapters (i.e. ICSP to pogo pin for SOIC /  
> thin
> DIP chips) available somewhere? TIA!
>
We are using this technique without a problem.

Our pogo pins are on 0.100" ctrs. We have created a pogo pin "holder" by
mounting the  pogo pin
receptacles on a 0.100" ctr 5-pin connector.  We then grab the
connector  like it was a  pencil., and
probe onto the PCB.

The "target" on the PCB is a pad of 75mils with a 28mil hole. These pads
have a HASL finish, but
a gold finish would work just as well.

We use a wedge-shaped probe head, usually called a "chisel".  When the
pogo array is "probed " into
the  5 holes,  a reasonably good connection is made when the chisel
point  enters each hole., with the chisel
forming several high-pressure contacts around the edge of the hole.

Another way of doing this  is to use sharp "needle point" probes against
a flat pad (no hole). That works
fine for a short while until the needle point wears down. After that you
will obtain a poor connection, and it will
be intermittent.


This works very well, and it is not expensive.

--Bob
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist