[PCB_FORUM] Re: sch4pins-pcb5pins

I usually require our engineers to have a schematic pin for every copper
connection in a footprint.

An unplated hole need not have a pin in the schematic but all copper does.

That way the circuit designer knows that there is a piece of metal on the
board that s/he can choose to connect or not connect.

If you make a no-connect mechanical pad in allegro, then it will always
float.  Further, I've seen some IPC netlist generators give warnings when it
finds "mechanical" copper (i.e. fiducials) on the board.  Doing it my way
prevents this problem as well.

Tom
Arira Design, Inc.
408-844-8433 x2 

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of sjcharles@xxxxxxx
Sent: Friday, November 04, 2005 2:12 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: sch4pins-pcb5pins

Shirley.
normally i show all pins whether the are NC or mounting for socket type
connector. I just got a sch which won't package and before i give it back i
wanted to have my answer straight about whether or not the NC pin needs to
be part of the symbol.
Thanks again
Sam
> 
> From: "Bolman, Shirley H" <shirley.h.bolman@xxxxxxxxx>
> Date: 2005/11/04 Fri PM 05:03:12 EST
> To: <icu-pcb-forum@xxxxxxxxxxxxx>
> Subject: [PCB_FORUM] Re: sch4pins-pcb5pins
> 
> Normally most software is not happy if all of the physical pins are not
> identified in
> a logic symbol. What is the 5th pin on the allegro footprint for? If it
> is a signal or
> ground pin then the part in the schematic should be updated. If it is
> just a mechanical
> mounting hole and not a "connect" pin then, there shouldn't be any
> problem. With allegro
> a mechanical hole is not considered a "pin" and they probably should be
> NPTH.
> 
> The same holds true if it is a surface mount "hold down" pad that has no
> electrical connection.
> It must be added as mechanical and not connect. Doing an inquire on the
> 5th pin in allegro
> should tell you what kind of a pin/pad it is.
> 
> Shirley in Oregon
> 
> -----Original Message-----
> From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of
> sjcharles@xxxxxxx
> Sent: Friday, November 04, 2005 12:37 PM
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] sch4pins-pcb5pins
> 
> Group: In orcad capture I have a four pin part and in allegro i have a 5
> pin part. Are there ways to make this work? In the past I've always made
> the sch part and pcb part to have equal number of pins.
> 
> Sam
> 
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