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Unconnected pins and net classes

autodeskguest

Hello,

 

I have a opamp circuit with an isolated supply, possible about 100 Volt away

from  normal ground. So all of the opamp circuits nets are on a net class

"pot", with normal design rules with regard to "pot" class nets and more

spacing to default class nets. The opamp however is in a SO8 package with

unconnected 1, 5 and 8. As they have no pins, i can't give them the class

"pot" and they are treated as class "default" and so false spacing

violations are displayed.

 

Floating copper, e.g. floating smd pads, should be treated as the class it

is checked against.

--

Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

 

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt

-

Tel. 06151 162516 -

Fax. 06151 164321 -

 

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  • On 03/27/2014 11:02 AM, Uwe Bonnes wrote:

    Hello,

     

    I have a opamp circuit with an isolated supply, possible about 100 Volt away

    from  normal ground. So all of the opamp circuits nets are on a net class

    "pot", with normal design rules with regard to "pot" class nets and more

    spacing to default class nets. The opamp however is in a SO8 package with

    unconnected 1, 5 and 8.

     

    If they have pins on the schematic, you can draw a net with no other

    connection, then give the nets the appropriate class.

     

    If you don't have pins on the schematic, your best bet would be to draw

    a wire or polygon on the restrict layer.

     

    HTH,

        - Chuck

     

Reply

  • On 03/27/2014 11:02 AM, Uwe Bonnes wrote:

    Hello,

     

    I have a opamp circuit with an isolated supply, possible about 100 Volt away

    from  normal ground. So all of the opamp circuits nets are on a net class

    "pot", with normal design rules with regard to "pot" class nets and more

    spacing to default class nets. The opamp however is in a SO8 package with

    unconnected 1, 5 and 8.

     

    If they have pins on the schematic, you can draw a net with no other

    connection, then give the nets the appropriate class.

     

    If you don't have pins on the schematic, your best bet would be to draw

    a wire or polygon on the restrict layer.

     

    HTH,

        - Chuck

     

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