On Dec 19, 2010, at 5:39 PM, Nathan House wrote:

>> 1 - The pins of IC1 are in pin number order!  That may save you a =20
>> few minutes making the symbol once, but wastes many times that over =20
>> the life of
>> the schematic as people have to figure out what's where.

> I grabbed the symbol from the Microchip Eagle library I found =20
> online. Are you suggesting I put the pins into "groups"? (like all =20
> the power pins next to one another, separating the different ports, =20
> etc..?).

I think it's a matter of style/opinion, and will somewhat depend on =20
the complexity of the application.  I've used symbols with logical =20
groupings, and wished they had at least some clue about actual pin =20
positions, so that I could make arbitrary connections from io ports to =20
external devices in a way that would make sense from a pcb routing =20
perspective.  And I've used symbols with pin-number ordering and =20
cursed the lack of logic.  And I've used symbols that someone had laid =20
out using SOME logic that I guess made sense to them, but I didn't like!

BillW

--=20
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