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Used Power instead of Supply on parts

autodeskguest

I have my schematic all done and have discovered that I should have used

Supply for ground connections to some of the ICS.  ERC comes up with an

error in places where I connected Vss to GND.  Do I need to go back and

correct every part or can I just ignore the ERC warnings?

 

--

John Bachman, W1JGB

AnaTek Corporation

 

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  • John Bachman wrote on Sat, 19 December 2009 07:17

    To clarify: When creating new components one can choose the type of

    pin.

     

    Actually it's called the pin "direction".  Apparently when you said "used

    Supply for ground connections" you really meant "set the pin direction of

    ground pins to Supply".  This was not clear.

     

    Quote:

    For all pins that are power supply or ground I chose "Power".

     

    Here's a heretical thought: Use the pin directions as intended and clearly

    documented.  The Supply pin direction is for pins that produce supply

    rails, like the output of a voltage regulator or a ground symbol.  Power is

    for pins that are expected to be connected to a supply rail, like Vdd and

    Vss pins of a CMOS chip.

     

    Quote:

    It appears that Eagle would be happier if I chose "Supply" for the pins

    that I will connect to a ground.

     

    No, you should use Supply for the single ground symbol and Power for the

    ground pins of the various parts connected to the ground net.

     

    Again, this is all clearly documented.  Try HELP PIN.  It may correct a few

    more unfortunate guesses.

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

Reply

  • John Bachman wrote on Sat, 19 December 2009 07:17

    To clarify: When creating new components one can choose the type of

    pin.

     

    Actually it's called the pin "direction".  Apparently when you said "used

    Supply for ground connections" you really meant "set the pin direction of

    ground pins to Supply".  This was not clear.

     

    Quote:

    For all pins that are power supply or ground I chose "Power".

     

    Here's a heretical thought: Use the pin directions as intended and clearly

    documented.  The Supply pin direction is for pins that produce supply

    rails, like the output of a voltage regulator or a ground symbol.  Power is

    for pins that are expected to be connected to a supply rail, like Vdd and

    Vss pins of a CMOS chip.

     

    Quote:

    It appears that Eagle would be happier if I chose "Supply" for the pins

    that I will connect to a ground.

     

    No, you should use Supply for the single ground symbol and Power for the

    ground pins of the various parts connected to the ground net.

     

    Again, this is all clearly documented.  Try HELP PIN.  It may correct a few

    more unfortunate guesses.

    --

    Browser access to CadSoft Support Forums at http://www.eaglecentral.ca

     

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