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Richard Hammerl

Richard is an engineer with 16 years experience in EAGLE customer support and is waiting for your questions.

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e14 Contributor over 15 years ago

Hi richard,

I´ve got a hand routed layout. Though each net is physically completely connected there are still air-wires left (see attached picture). Ratsnest brings no change. Is there any solution except of routing those air-wires ? Using the Auto-Router is no option - it´s an hf-design.

Thanks in advance

Uwe
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Richard_H over 15 years ago in reply to e14 Contributor

HI,

just saw your message here, after answering the same question in german. But here you attached a picture which could help a bit. When you use RATSNEST for calculating the polygons, are the polygons filled? Do they have the name of the signal the should belong to?
It is difficult to give advice here, could you send me the board file via private email to supoprt@cadsoft.de.
So I can take a look into it.

Regards,
Richard
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e14 Contributor over 15 years ago in reply to Richard_H

Does anyone know where I can find an Eagle footprint for a QFN-20 3mm x 3mm? The only ones I can find are 4mm x 4mm.

This is for an Atmel ATtiny24A-MMH

Thanks;

JS
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e14 Contributor over 15 years ago in reply to Richard_H

Does anyone know where I can find an Eagle footprint for a QFN-20 3mm x 3mm? The only ones I can find are 4mm x 4mm.

This is for an Atmel ATtiny24A-MMH

Thanks;

JS
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levafreidin over 15 years ago in reply to e14 Contributor

    Hello Jskene,
         For 20 pins, you can make footprint by yourself for half an hour. Pay attention: exposed pad has to be connected to ground, so it is the pin, #21. For automatic assembly, you can follow the Atmel's drawing. For manual assembly (prototyping PCB), I usually drill hole (so, it became Through Hole Pin) large enough for my soldering iron tip. I also use low temperature solder to connect it to the Ground Plane, to avoid overheating.
    For manual assembly, it is also good idea to make SMD pads a little bit longer, to make soldering easier.
    If you need real help (not advise), you can reach me by e-mail "levafreidin@yahoo.com" or phone (805)-750-0665 cell.
         Good luck!
              Lev.
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