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Autodesk EAGLE
EAGLE User Support (English) ERC warnings
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Related

ERC warnings

autodeskguest
autodeskguest over 9 years ago

Why is it that the ERC tool generates warnings for POWER pins that are

connected to SUPPLY pins?

 

I know I can approve them but I still find it odd since in my opinion

device's POWER pins are precisely intended to be connected to SUPPLY pins

but apparently Eagle has a different opinion in this respect.

 

Robert

 

--

http://www.eaglecentral.ca :: The original and best browser access to CadSoft EAGLE support forums.  Supported by EAGLE licenses purchased through us :: http://www.eaglelicenses.com

 

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  • autodeskguest
    autodeskguest over 9 years ago

    On 19.11.2016 18:34, Robert Blancquaert wrote:

    Why is it that the ERC tool generates warnings for POWER pins that are

    connected to SUPPLY pins?

     

    I know I can approve them but I still find it odd since in my opinion

    device's POWER pins are precisely intended to be connected to SUPPLY pins

    but apparently Eagle has a different opinion in this respect.

     

    One of the problems with the supply pin is that it explicitly defines

    the name it wants on the net connected. The problem this causes on multi

    rail power designs have been discussed in several threads.

     

    The other problem is that DRC does not check if you actually have a

    supply for your design. The single pin supply symbols only act as a poor

    page connector with implicit netname. This means it is easy to forget

    that you may need a regulator or power input for the supply symbols

    used. The DRC will not warn you about this.

     

     

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  • autodeskguest
    autodeskguest over 9 years ago in reply to autodeskguest

    Am 21.11.2016 um 10:17 schrieb Morten Leikvoll:

    SNIP

     

    The other problem is that DRC does not check if you actually have a

    supply for your design. The single pin supply symbols only act as a poor

    page connector with implicit netname. This means it is easy to forget

    that you may need a regulator or power input for the supply symbols

    used. The DRC will not warn you about this.

     

     

    IMHO a very important point you have raised that should be taken care of.

    So far I have been lucky image

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

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  • autodeskguest
    autodeskguest over 9 years ago in reply to autodeskguest

    On 21.11.2016 11:04, Joern Paschedag wrote:

    Am 21.11.2016 um 10:17 schrieb Morten Leikvoll:

    SNIP

     

    The other problem is that DRC does not check if you actually have a

    supply for your design. The single pin supply symbols only act as a poor

    page connector with implicit netname. This means it is easy to forget

    that you may need a regulator or power input for the supply symbols

    used. The DRC will not warn you about this.

     

     

    IMHO a very important point you have raised that should be taken care of.

    So far I have been lucky image

     

    I have been lucky too, but I did once end up with a regulator that was

    not in use image So maybe that could be part of the check.

     

    But I have started to make output pins of any regulator or similar

    device have "sup" direction on their output pins. This helps me

    slightly, but I do get a lot of the op warning messages. I prefer those

    messages over no warnings tho.

     

     

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  • autodeskguest
    autodeskguest over 9 years ago in reply to autodeskguest

    On 21.11.2016 11:04, Joern Paschedag wrote:

    Am 21.11.2016 um 10:17 schrieb Morten Leikvoll:

    SNIP

     

    The other problem is that DRC does not check if you actually have a

    supply for your design. The single pin supply symbols only act as a poor

    page connector with implicit netname. This means it is easy to forget

    that you may need a regulator or power input for the supply symbols

    used. The DRC will not warn you about this.

     

     

    IMHO a very important point you have raised that should be taken care of.

    So far I have been lucky image

     

    I have been lucky too, but I did once end up with a regulator that was

    not in use image So maybe that could be part of the check.

     

    But I have started to make output pins of any regulator or similar

    device have "sup" direction on their output pins. This helps me

    slightly, but I do get a lot of the op warning messages. I prefer those

    messages over no warnings tho.

     

     

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  • autodeskguest
    autodeskguest over 9 years ago in reply to autodeskguest

    Am 21.11.2016 um 13:51 schrieb Morten Leikvoll:

    On 21.11.2016 11:04, Joern Paschedag wrote:

    Am 21.11.2016 um 10:17 schrieb Morten Leikvoll:

    SNIP

     

    The other problem is that DRC does not check if you actually have a

    supply for your design. The single pin supply symbols only act as a poor

    page connector with implicit netname. This means it is easy to forget

    that you may need a regulator or power input for the supply symbols

    used. The DRC will not warn you about this.

     

     

    IMHO a very important point you have raised that should be taken care of.

    So far I have been lucky image

     

    I have been lucky too, but I did once end up with a regulator that was

    not in use image So maybe that could be part of the check.

     

    But I have started to make output pins of any regulator or similar

    device have "sup" direction on their output pins. This helps me

    slightly, but I do get a lot of the op warning messages. I prefer those

    messages over no warnings tho.

     

     

    Same thoughts here with me image

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

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