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TSSOP 38 routing problems

BigJon

Hi,

 

I've created a dozen or so through hole boards with Eagle (mostly Arduino shields), but I need to create a surface mount board. The DAC I need to use is a TSSOP 38 package (AD5348).

 

I created a custom library following an online tutorial for the DAC and copied the TSSOP 38 package for a different existing library.

 

I laid out the board (with the DAC and some op-amps) but the auto route couldnt get past about 75%.

 

I played for a while, but couldn’t get any further. So, I thought I'd test the part with a simple breakout board. I created a board with just the TSSOP 38 device, fanned out to 0.1" headers.

 

However, to my surprise, the auto route failed to route this simple board as well. See below. Why would the auto route not be able to fan out this simple board ?

 

What am I doing wrong ? Or am I expecting too much ?

 

I'm using the free version of Eagle v6.3.0 with a two layer board.

 

Thanks.

 

Jon.

 

image

 

image

Parents
  • 0

    There may be a way of getting Eagle to do this better (I don't use Eagle so I can't say) but I think you are expecting rather a lot from a free tool ! In my experience cheap auto routers (< £10k) are all very limited and rarely worth using at all. Why don't you route the board by hand - that way you can get the tracks to go where they should from an electronic point of view and it will work much better.

     

    Michael Kellett

  • 0 in reply to michaelkellett

    On Tue, 27 Nov 2012 08:37:59 +0000, Michael Kellett wrote:

     

    There may be a way of getting Eagle to do this better (I don't use Eagle

    so I can't say) but I think you are expecting rather a lot from a free

    tool ! In my experience cheap auto routers (< £10k) are all very limited

    and rarely worth using at all. Why don't you route the board by hand -

    that way you can get the tracks to go where they should from an

    electronic point of view and it will work much better.

     

    I've found the Eagle autorouter to be quite useful.  Expecting it to do

    the same thing as a super-zoot tool is unrealistic, but it does a

    competent job when done right.

     

    --

    My liberal friends think I'm a conservative kook.

    My conservative friends think I'm a liberal kook.

    Why am I not happy that they have found common ground?

     

    Tim Wescott, Communications, Control, Circuits & Software

    http://www.wescottdesign.com

     

Reply
  • 0 in reply to michaelkellett

    On Tue, 27 Nov 2012 08:37:59 +0000, Michael Kellett wrote:

     

    There may be a way of getting Eagle to do this better (I don't use Eagle

    so I can't say) but I think you are expecting rather a lot from a free

    tool ! In my experience cheap auto routers (< £10k) are all very limited

    and rarely worth using at all. Why don't you route the board by hand -

    that way you can get the tracks to go where they should from an

    electronic point of view and it will work much better.

     

    I've found the Eagle autorouter to be quite useful.  Expecting it to do

    the same thing as a super-zoot tool is unrealistic, but it does a

    competent job when done right.

     

    --

    My liberal friends think I'm a conservative kook.

    My conservative friends think I'm a liberal kook.

    Why am I not happy that they have found common ground?

     

    Tim Wescott, Communications, Control, Circuits & Software

    http://www.wescottdesign.com

     

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