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EAGLE User Support (English) How to change power pin connection on logic chip library
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How to change power pin connection on logic chip library

Former Member
Former Member over 13 years ago

I have a circuit that can run from 18V to 32v but has a digital switching system with a decoder and other arrangements of logic gates.  I have a power suply setup that will always derive a +5v terminal to all the digital serctions of the circuit.  The problem is eagle's default library automaticlly defaults the power and ground pins to the main power and ground and has no option to wire those pins in the schematic.  I went to the library and changed the pins from pwr to passive hopping that it will allow for the power and ground connections to show in the schematic but to no avail.  With the complexity of the circuit I do not want to manually route the digital VCC from the other 2 power supplies in the circuit in fear that I will make a small error in the board which will indeed be costly.  Is there anyway I can change the subnet of the power pins on the logic family chips to that which I desire?  When I go into properties and change the subnet of a logic power pin to the same subnet of the +5v DC power supply out, it also changes the subnet of the main power supply to +5V and still does not connect that line to the digital supply.

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  • Former Member
    Former Member over 13 years ago

    Justin Moss wrote:

    >I have a circuit that can run from 18V to 32v but has a digital

    >switching system with a decoder and other arrangements of logic

    >gates.  I have a power suply setup that will always derive a +5v

    >terminal to all the digital serctions of the circuit.  The problem is

    >eagle's default library automaticlly defaults the power and ground

    >pins to the main power and ground and has no option to wire those pins

    >in the schematic. [...]

     

    help invoke

    --

     

    Lorenz

     

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  • Former Member
    Former Member over 13 years ago

    Am 02.09.2012 05:13, schrieb Justin Moss:

    I have a circuit that can run from 18V to 32v but has a digital switching system with a decoder and other arrangements of logic gates.  I have a power suply setup that will always derive a +5v terminal to all the digital serctions of the circuit.  The problem is eagle's default library automaticlly defaults the power and ground pins to the main power and ground and has no option to wire those pins in the schematic.  I went to the library and changed the pins from pwr to passive hopping that it will allow for the power and ground connections to show in the schematic but to no avail.  With the complexity of the circuit I do not want to manually route the digital VCC from the other 2 power supplies in the circuit in fear that I will make a small error in the board which will indeed be costly.  Is there anyway I can change the subnet of the power pins on the logic family chips to that which I desire?  When I go into properties and change the subnet of a logic power pin to the same sub

    net of the +5v DC power supply out, it also changes the subnet of the main power supply to +5V and still does not connect that line to the digital supply.

    The libraries are usually according to the manufacturers names for the

    pins. So why not providing different names in the sheets for the supply

    like 5V or 3.3V etc. and connect them to VCC on the devices. Same goes

    for 0V, common etc for the GND Pins. These will not connect to the

    supplies automatically and that is imho what you want. Eagle will

    provide a warning that xyz-voltage is connected to VCC because the names

    are not equal, but that warning can then be ignored.

    If you don't find suitable supply symbols in the supply.lbr then just

    create some new ones.

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

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