Asumming each of the boards in the sandwhich is 2 layer, you could design your
footprint as a single part but each pad for the coil goes to the bottom 2 layers
and
 pads for contact go to the top 2 layers.

It becomes a 4 layer stack and each pad is made of a stack of  individual layer
pads ie top layer and mid layer 1  for the contacts, mid layer 2  and  bottom
layer
for the coil.

Then you could place and route your components and after you are happy with
the result do a global select to move the top and bottom layer pairs to seperate
boards.

This will keep the relay footprint in alignment as the top and bottom primitives
will be locked.


Id also be looking for some sort of socket so you can open up the boards for
repair or debug. Trying to unsolder 18 relays is no fun.


_______________________________________________________________

Clive Broome
IDT Sydney Design Centre        Ph:         +61 2 9763 3513
8 Bayswater Dr, Homebush        Fax:        +61 2 9763 3409
Sydney,  NSW, 2127              Email:[EMAIL PROTECTED]
Australia

         Australia's Leading Semiconductor Designers
---------------------------------------------------------------







"Glennster" <[EMAIL PROTECTED]> on 02/06/2001 01:46:15 PM

Please respond to [EMAIL PROTECTED]

To:   Multiple recipients of list proteledausers
      <[EMAIL PROTECTED]>
cc:    (bcc: Clive Broome/sdc)

Subject:  [PROTEL EDA USERS]:  Help with a daughter board



Hello everyone,

I am working on an RF design which has 2 boards, essentially a "sandwich".

The bottom board has the digital stuff and 18 relays.  The relays have
physical connections on the top and bottom of the case (Coil on the bottom
and contacts on the top). The top board has all the nasty RF.

There is also a 4 pin header connecting the 2 boards together.

I have footprinted the relays in 2 parts, coil and contacts.

What is the best way to ensure that the 2 boards mate exactly.  When
assembled, the top board goes down on top of the relays with the contacts
sticking through the PCB and is soldered on the top along with the header.

Any input is greatly appreciated!

Thanks,
Glenn
KE3MF
www.ldgelectronics.com




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