[PCB_FORUM] Re: Schematic drafting practices

Regarding the power/ground pin table, if you use implicit power/ground pins and 
POWER_GROUP properties in Cadence/Concept, the power/ground pins may NOT be 
shown on the component schematic entities, so a table is most helpful.  If 
you're using ORCAD as your schematic capture vehicle, you end up showing the 
power/ground pins explicitly and the table may be superfluous.

Putting the cross-reference info on the first page of the schematic 
standardizes where you need to look to find it.  If it's a 10-page schematic 
and you don't routinely put the cross-ref material on the first page, you have 
to flip through multiple pages to find it.  Better to have it in a consistent 
spot whether the schematic is 3 pages or 30.

/s/jar (Alan Ritter, alan.ritter@xxxxxxxxxx)
        http://www.mtritter.org
 

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Austin Franklin
Sent: Friday, March 27, 2009 11:17 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Schematic drafting practices

Hi Alan,

> Some things that are very useful on the first page of the schematic:
>
> 1.  A table of contents specifying what functional sections are
> on which page(s) of the schematic.

And a block diagram.

> 2.  A table of power/ground pins for all ICs on the schematic.

I see no reason for that one these days.  What's your reason?  All
power/ground pins should be shown on the components, and large devices have
them on separate symbols, as we've discussed here.

> 3.  A table of test points with signal names and page numbers
> where they show up.

I'm not sure I'd put that on the first page, but it isn't a bad idea to put
that information in a table somewhere.

Regards,

Austin

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