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'[PIC]: Eagle leaves all PIC traces unrouted.'
2005\07\08@041438 by Steve Murphy

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I'm a first time Eagle Light user. I first used Olin's library,
everything routed perfectly. I needed to use a smaller package, so I
replaced the SOIC from Olin's library with a 20-pin SSOP from the
standard "microchip" library that ships with Eagle. Board contains the
PIC, a couple switches, 7 resistors and  4 LEDs. When I ran autorouter,
*every* connection to the PIC came up unrouted.

Is there a simple solution to this (e.g., common newbie problem) or
should I post more info?

Thanks,

 --Steve Murphy.

2005\07\08@042907 by William Chops Westfield

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On Jul 8, 2005, at 1:14 AM, Steve Murphy wrote:

>  so I replaced the SOIC from Olin's library with a 20-pin SSOP from
> the standard "microchip" library that ships with Eagle.  When I ran
> autorouter, *every* connection to the PIC came up unrouted.
>
> Is there a simple solution to this (e.g., common newbie problem)
> or should I post more info?
>
Change the "routing grid" on the autoroute window to a smaller number.
Ideally, it should be a common factor of the pin spacings of all your
parts and the grid you used to place them, but I think it will manage
to route as soon as it is 'close enough.'  This does slow down the
autoroute process; you don't want it to be TOO small...

BillW

2005\07\08@075224 by olin piclist

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Steve Murphy wrote:
> I'm a first time Eagle Light user. I first used Olin's library,
> everything routed perfectly. I needed to use a smaller package, so I
> replaced the SOIC from Olin's library with a 20-pin SSOP from the
> standard "microchip" library that ships with Eagle. Board contains the
> PIC, a couple switches, 7 resistors and  4 LEDs. When I ran autorouter,
> *every* connection to the PIC came up unrouted.
>
> Is there a simple solution to this (e.g., common newbie problem) or
> should I post more info?

You probably have the minimum width/space set so that a trace can't route to
one pin without violating the rule on neighboring pins.


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2005\07\08@111431 by Steve Murphy

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> Change the "routing grid" on the autoroute window to a smaller number.
> Ideally, it should be a common factor of the pin spacings of all your
> parts and the grid you used to place them, but I think it will manage
> to route as soon as it is 'close enough.'  This does slow down the
> autoroute process; you don't want it to be TOO small...
>
> BillW

This worked like a charm! THANKS!  :-)

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