There is a great deal of difference between an interposer and an
emulation socket. I believe Jack is looking for an interposer that his
experimental "daughterboard" is going to be soldered to, and the
interposer is then soldered to the pwb, onto the PLCC52 pattern already
present.
These types of interposers are typically used to accomodate a mismatch
in pinouts, or to try out a different circuit in place of a particular
component. For example, you can have a pad layout on the board for a
particular component in QFP package, but your stock or the only
available component packaging is a PLCC52 or dual SIP pattern. An
interposer "crossconnects" the pads on top to leads around the
interposer in the QFP pattern, so you can then use your PLCC52 part on
the circuit boards you have in stock that require a QFP part.
In Jack's case (I think) he wants to design a small daughterboard that
he can solder to an interposer that will in turn be soldered to the
PLCC52 pattern on the motherboard.
Nearly any small circuit board can be fabricated with the attachment to
match the component pad layout on a given circuit board, or motherboard.
Ironwood specializes in this, and they are very good at it.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Haynes, Kim
Sent: Monday, November 20, 2006 2:05 PM
To: [log in to unmask]
Subject: Re: [TN] Attaching a Test Board to an Existing Footprint
http://www.adapters.com/
http://www.emulation.com/
Both of these venders have pretty good selections.
Bye,
Kim
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Monday, November 20, 2006 1:13 PM
To: [log in to unmask]
Subject: [TN] Attaching a Test Board to an Existing Footprint
Greetings,
I want to design a little test board, and somehow connect it to a PLCC52
footprint of an existing design.
What I want to know is:
What is the 52-pin piece that I solder to the existing board and connect
to my test board?
I thought it was called an interposer, but I'm gettin' no hits.
Does anyone know where I can get some kinda socket dealie-mabob that
will fit a PLCC52?
Jack
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