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

Dear Ed,
 
If Cadence was able to numbering 1,2,3 for a 3 pins and 1,2,3,4 (and not 
1,2,3,3) for a 4 pins device, it will be fine.
We already have devices with different number of pins... either in NC_PINS 
section or POWER_PINS...
So I was just asking for something I was thinking it can be possible.
 
My english is probably not good enough to understand what you meant with this 
kind of comments....
could you explain?
where did I ask for 1,2,3,3??
 
    William.
 
 
 
 

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: 11 October, 2006 3:08 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: same symbol - different number of pins



Sorry to have submitted what you already knew. Sounds like you have your hands 
full trying to keep up with the EE's! 
If Cadence was able to allow numbering multiple pins the same (i.e. 1,2,3,3) 
your quest would be simpler. Perhaps a future enhancement??? 
Ed 



"William Billereau" <William.Billereau@xxxxxxx> 
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10/11/2006 08:15 AM 
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[PCB_FORUM] Re: same symbol - different number of pins

        




thanks, but I was just wondering how to avoid this. 
Just to warn schematic designers that by choosing LM1117 they can have 
different types. 
  
(we have a lot of them taking the first thing that "looks like" what they want. 
Then we have to change later for what they purchased....) 
  
If there is no other way I will do it as you suggest. 
  
    William. 
  
  
  

________________________________


From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: 11 October, 2006 1:59 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: same symbol - different number of pins


Make a different schematic symbol for each (part number) with appropriate pin 
counts. 


"William Billereau" <William.Billereau@xxxxxxx> 
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10/11/2006 07:48 AM 

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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 
<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 
<ftp://ftp.cadence.com/>  but this FTP site is unaccessible. 
Does anybody get it somewhere? 
 
 
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