[PCB_FORUM] Re: same symbol - different number of pins

William,
 
I did a workaround for a part similar to the one you describe.  
 
To use only one symbol body with three pins and map it to a physical part that 
has four pins I made two alt_symbols. The first physical symbol would have 
three pins and one pin made of a copper shape (no pin number).  The second 
physical symbol would have three pins also, but this time where the copper 
shape was on the previous symbol, there would be a pin there and the copper 
shape would be where that pin number was.  This workaround was done for a part 
which had a ground tab that was split into two pins, either of which could be 
used for ground.  If you do something similar but both pins have to be used, 
you can add the shape to whichever net you need to connect it to.
 
Regards,
 
Carolyn


________________________________

        From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of William Billereau
        Sent: Wednesday, October 11, 2006 6:47 AM
        To: icu-pcb-forum@xxxxxxxxxxxxx
        Subject: [PCB_FORUM] same symbol - different number of pins
        
        
        Hello All.
         
        Is there a solution for such component in ConceptHDL:
        LM1117 from National:
         
        DTX type = TO252 3 pins
        MPX type = SOT223 4 pins . the fourth is the tab that has to be 
connected to OUT pin 2.
         
        How to do it to:
        -have only one symbol body
        (I think without any "tab" pin. I tried with 2 versions on with the TAB 
the other without. But Add Part only take version 1 by default.)
         
        -Connect this TAB automatically to pin 2 OUT
        (I tried to add in the parttable to MPX type a PACK_SHORT='(2,4)' but 
unsuccessfully.)
         
        - Select anyone of both different type in a single parttable..
         
        Thanks in advance.
         
         
        PS. This case seems to be a common problem. By searching "regulator 
tab" in sourcelink, it returns a case for a MC7805CT2 (or 3).
        http://sourcelink.cadence.com/docs/db/kdb/1998/July/1816165.html
        but the test2_archive.zip contains only a body with the tab, but 
selecting a new one shows a 3 pin JEDEC and the import logic returns a 
"incorrect pin number".
        So this test2 does not work.
        They speak about a multipin.tar available on ftp.cadence.com but this 
FTP site is unaccessible.
        Does anybody get it somewhere?
         
         
        
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