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How do I do a Solder Mask Defined Pad with Eagle?

autodeskguest

Hello,

 

I have been learning and evaluating Eagle for our company. I like what I

see so far but I cannot figure out how to do a Solder Mask Defined Pad. As

an example of some devices that use them

 

In Figure 1 here

http://www.irf.com/technical-info/appnotes/an-1028.pdf

 

http://www.eetasia.com/STATIC/PDF/200906/EEOL_2009JUN16_EDA_AN_01.pdf

 

Page 13

http://www.freescale.com/files/32bit/doc/package_info/PBGAPRES.pdf

 

In some cases we have projects that are required to withstand high G

forces. We would like to keep the option of doing a Solder Masked Defined

Pad open for just such a case.

 

Unfortunately we cannot directly define a solder mask pattern that is

smaller than the pad in the footprint editor. Also if we could the

automatic soldermask generation in the preferences would overwrite it.

 

Does someone have a work around other than manually editing the gerbers? I

would hate to have to do this on a 300+ ball BGA.

 

Thank You

 

Conn Clark

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  • ConnClark wrote on Mon, 29 June 2009 12:11

    Hello,

     

    I have been learning and evaluating Eagle for our company. I like what I

    see so far but I cannot figure out how to do a Solder Mask Defined Pad. As

    an example of some devices that use them

     

    In Figure 1 here

    http://www.irf.com/technical-info/appnotes/an-1028.pdf

     

      http://www.eetasia.com/STATIC/PDF/200906/EEOL_2009JUN16_EDA_

    AN_01.pdf

     

    Page 13

      http://www.freescale.com/files/32bit/doc/package_info/PBGAPR ES.pdf

     

    In some cases we have projects that are required to withstand high G

    forces. We would like to keep the option of doing a Solder Masked Defined

    Pad open for just such a case.

     

    Unfortunately we cannot directly define a solder mask pattern that is

    smaller than the pad in the footprint editor. Also if we could the

    automatic soldermask generation in the preferences would overwrite it.

     

    Does someone have a work around other than manually editing the gerbers?

    I would hate to have to do this on a 300+ ball BGA.

     

    Thank You

     

    Conn Clark

     

     

    Hello Conn,

     

    You can do this in EAGLE easily.  In the package editor turn off "STOP"

    for the smd(s) in question.  You can do it with the info properties box for

    individual pads.  But if you have a lot then group them all and use the

    change command to apply to the whole group.  Syntax is something like

     

    CHANGE STOP OFF

     

    but see the help for the change syntax, this is off the top of my head and

    could be wrong.

     

    Then define the mask opening you want on the appropriate t/bStop layer.

    If you set your grid correctly then you can copy it easily to the new

    location to get a row, then group, cut, and paste rows to fill out the

    rest.

     

    That's it.  You then need to update from the design if you already have a

    design with the old package included.

     

    Cheers,

     

    James.

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