Eagle ATMega328 help please

Discussion in 'The Projects Forum' started by remout, May 30, 2011.

  1. remout

    Thread Starter New Member

    Apr 18, 2011
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    0
    I working on my first PCB eagle file and am confused. In the attached image, on the left is a pin out for the ATMega168 (same pin out as 328). On the right is a 28 pin socket for the ATMega.

    I don't understand how the pins on the ATMega related to the socket. I was expecting 14 or less on each side.

    Thanks!

    [​IMG]
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
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    Looks like a 32 pin package. That is 16 pins per side. The schematic symbol can be made anyway you want. Someone has just created it to suit there needs.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    I see that 328" is a bit different from "128".
     
  5. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    The 168/328 comes in several different packages:

    MLF (VQFN) 32
    PDIP 28
    TQFP 32

    One package has 28 pins and the others have 32 pins. The model decal shown above has 32 pins and is not what you want if you are using the 28 pin DIP package. You may have to make a new decal for the schematic if you can not find one online...
     
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