Karl,
As the layout designer, it is our job to train the young engineer in
good practices. Having multiple symbols with different pinouts is a
librarian's nightmare and will surely screw up the assembly process with
unnecessary delays. As a company(read team), we have customers. Who
takes the heat when the layout is wrong? I can tell you it isn't the
engineer who insisted on a wrong concept. Being a designer is so much
more than being someone who hooks up wires.
Regards,
Ron Scott C.I.D.
Texas Instruments
Tel: 214.480.4715
Cell: 972.816.7978
[log in to unmask]
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Karl
Bates
Sent: Friday, December 10, 2004 08:54
To: [log in to unmask]
Subject: Re: [DC] Din connectors
If the connector is not marked with a polarity indicator, you can number
it
any way the engineer wants. remember, they are the customer.
Karl
From: "Jack C. Olson" <[log in to unmask]>
Reply-To: "(Designers Council Forum)" <[log in to unmask]>,
"Jack C. Olson" <[log in to unmask]>
To: [log in to unmask]
Subject: Re: [DC] Din connectors
Date: Thu, 9 Dec 2004 12:23:51 -0600
Oh, we have gotten burned SO many times for this.
For example, an engineer will have a cable between two connectors, and
wants the schematic to show that "Pin 1 is connected to Pin 1", which
seems perfectly logical to him.
But in the real world he is really connecting Pin 1 to Pin 28 or
whatever, and we are asked to build a fake mirrored conector to make his
schematic look pretty (Pin 1 to Pin 1), and the rest of the world
suffers the consequences forever. And quite often the engineer ends up
confusing himself because he can't remember in which cases he did it
that way and only sees the assembled board in front of him, which has
the Pin 1 polarity marked right on the connector which doesn't match the
fake mirrored silkscreen, and on and on....
my advice: DON'T DO IT!
Your job is to convert his ideas into a real physical thing, and once
that's done he will likely be out of the picture for the rest of the
life of the product.
All of the rest of your "customers" down the line are depending on you
to make it right. Think of them, too.
Jack
Ted Tontis
<ttontis@ENGAGENE
T.COM>
Sent by:
To
DesignerCouncil
To
<DesignerCouncil@ [log in to unmask]
ipc.org>
cc
12/09/2004 11:40
AM
Subject
Please respond to [DC] Din connectors
"(Designers
Council Forum)"
<DesignerCouncil@
IPC.ORG>; Please
respond to
Ted Tontis
<ttontis@ENGAGENE
T.COM>
Caterpillar: Confidential Green Retain Until: 01/08/2005
Retention Category:
G90 -
General
Matters/Administration
When building footprints for connectors do you follow the pin numbering
for the connector, or the mating connector? I know what the answer is
going to be, I am just fighting with one of the engineers over this and
I want to confirm that I am correct.
I have a 96 pin male din connector on the main board, I have a
96 pin female din on the daughter card. The female connector is mounted
to the secondary side of the pcb. I tried to tell the Engineer that
moving the pins around is only going to make things more confusing to
the assembly house. This was his response.
would you PLEASE use the same pin numbers that are on the XYZ.
the part data sheet is totally irrelevant.
it only plugs into one thing. it has no other use.
right or wrong the XYZ is the master document and the only reason for
the boards existence.
Ted Tontis CID
Engage Networks Inc.
1320 N. Dr. Martin Luther King Drive
River Level
Milwaukee, WI 53212
PH 414-918-4267
FX 414-273-7601
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