Subscripts in pin names
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Posted by Joel Kolstad on June 21, 2007, 6:49 pm
Please log in for more thread options In data books, the draftsmen who create the symbols will show names like "VCC" with the "CC" subscripted as you'd expect. Does anyone know of a schematic capture tool that supports that use of sub- and super-scripts in pin names? Thanks, ---Joel Kolstad | ||||||||||||||||||||||
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Posted by Mak on July 2, 2007, 2:45 am
Please log in for more thread options wrote: In majority of the cases, subscripts or superscripts are appended as text next to V, so VDD or VCC would work just fine. Care must be taken in the cases where some chips have VCC and VDD as power connections and they are hidden in the schematic. You should explicitly connect VCC, VDD with your power source which comes out of a regulator like V3_3 or V5_0 or direct input as V5_0 Hope this helps Mansoor | ||||||||||||||||||||||
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Posted by Joel Kolstad on July 2, 2007, 5:51 pm
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> In majority of the cases, subscripts or superscripts are appended as
> text next to V, so VDD or VCC would work just fine. Sure, they "work" just fine, but it's too bad that CAD software doesn't make it easy to have them *look* the way they were intended as well. > Care must be taken
> in the cases where some chips have VCC and VDD as power connections > and they are hidden in the schematic. These days I never hide power pins... it's quite uncommon today to have designs that don't have multiple rail voltages running around. ---Joel | ||||||||||||||||||||||
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Posted by Marra on July 3, 2007, 7:45 pm
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>
> > > In majority of the cases, subscripts or superscripts are appended as
> > text next to V, so VDD or VCC would work just fine. >
> Sure, they "work" just fine, but it's too bad that CAD software doesn't make > it easy to have them *look* the way they were intended as well. > > > Care must be taken
> > in the cases where some chips have VCC and VDD as power connections > > and they are hidden in the schematic. >
> These days I never hide power pins... it's quite uncommon today to have > designs that don't have multiple rail voltages running around. > > ---Joel It would be a pretty stupid engineer who didnt know what VCC was if it wasnt in superscript ! I use up to 8 character net names in my software and it works fine. | ||||||||||||||||||||||
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Posted by Joel Kolstad on July 5, 2007, 12:05 pm
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> It would be a pretty stupid engineer who didnt know what VCC was if it
> wasnt in superscript ! > I use up to 8 character net names in my software and it works fine. You're missing the point: Just because one can get by without subscripts, lower case, (effectively) unlimited length pin names, etc. is no reason to not support them in a piece of software. Heck, people got along just fine on PCs when file names were restricted to upper-case only, 8.3 characters, no spaces, etc... but I'd wager that most people wouldn't want to go back to that system, now that they're used to being able to do more. | ||||||||||||||||||||||
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> with the "CC" subscripted as you'd expect. Does anyone know of a schematic
> capture tool that supports that use of sub- and super-scripts in pin names?
>
> Thanks,
> ---Joel Kolstad