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Relay footprint with Orcad Layout

Discussion in 'Electronic Design' started by [email protected], Mar 30, 2007.

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  1. Guest

    Hi everybody,
    I have a little problem in assigning a footprint
    to a 8 pins relay using "OrCAD Layout".
    I have a power relay with 8 pins: 1 for coil1, 1 for coil2, 2 each for
    NO, NC and COMON. Lagically speaking this component has 5 connetions
    (coil1, coil2, NO, COMMON, NC) but 8 fisical connections.
    So I have designed a schematic component with 5 pins and a footprint
    with 8 pins.
    So here comes the problem:how can I assign 2 padstacks to a same pin?
    I am a bit baffled..."Layout" doesn't allow to rename two different
    padstacks with the same name or link two pads with a same pin.


  2. Eeyore

    Eeyore Guest

    How on earth can you make it a component with 5 pins ? I'd love to see it !

  3. I think he means the schematic component has 5 pins due to dropping the
    redundant pins for the relay contacts. The Layout part would have all 8

    Personally, I would prefer to see all 8 contacts on the schematic. Makes
    troubleshooting easier, and it's less confusing to the software.

    However, you could probably make an elongated pad with the named hole on one
    end, and place another plated hole in the other end. The second hole would
    not carry a net identifier or pin number, but would be electrically
    connected. This would have to be in the Layout footprint.

  4. Guest

    Thanks Chris for your answer!
    Anyway in the meantime I have discovered a trick to move around the
    problem: I have created a herarchical block with two 5 pins each block
    (2 of them are shared ) nd then I have used only the first sub-block.
    It seems to work.

    And thanks also to Graham that probably doesn't know that the world is
    full of componentswith 5 pins (e.g. many regulators)
  5. On 30 Mar 2007 01:12:52 -0700, the renowned
    I think you should show the pins on the schematic with a line between
    them on the symbol. You can connect them with traces on your layout,
    or not, depending on the requirements.

    There's a similar issue with tact switches which have internal jumpers
    (4 pins for an SPST-NO switch).
  6. qrk

    qrk Guest

    Make the schematic show the part with all the pins. If two pins are in
    parallel, show that on the schematic part and connect the two pins
    together in the schematic drawing. This is common practice. Would you
    make a schematic symbol of an FPGA showing only one ground pin when
    the part actually has 78 ground pins? The nice thing about CAD, as
    opposed to doing this the old way using tape, your net list from the
    schematic is transfered to the PCB layout making wiring errors
    non-existant if you remember to perform a DRC. Don't try short-cut the
    system because you're too lazy to make a proper schematic symbol! It's
    there to help you.
  7. vasu

    vasu Guest

    hi chris

    this is vasu . i am learning orcad since one week. i have a problem.
    how can i prepare two different padstacks for a single footprint. i
    mean in a foot print for example for pin 1 i want a square shaped
    padstack and for pin2 if want a round padstack. how can i prepare
    these two padstacks and how to save them. please help me i am just
    learning orcad.
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