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'[EE]: Eagle missing power connections'
2006\02\14@220230 by Rob Robson

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Here's another head-scratcher from an Eagle novice.  The Vcc and ground connections are missing from most of the ICs on my board.  They don't appear on the schematic either, although they're present in the devices themselves (in the library).  This wouldn't be a huge problem if not for the fact that Eagle won't seem to let me route traces manually if there isn't already an "airwire" connection.  Is there some command to make the predefined device power connections appear on the schematic and/or the board?

Many thanks,
Rob

2006\02\14@233443 by Sergey Dryga

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Rob Robson <rob <at> silk.net> writes:

>
> Here's another head-scratcher from an Eagle novice.  The Vcc and ground
connections are missing from most
> of the ICs on my board.  They don't appear on the schematic either, although
they're present in the devices
> themselves (in the library).  This wouldn't be a huge problem if not for the
fact that Eagle won't seem to let
> me route traces manually if there isn't already an "airwire" connection.  Is
there some command to make the
> predefined device power connections appear on the schematic and/or the board?

I had same problem while ago.  Solution that worked forme is to use the same
supply symbol as in the device.  Some devices have Vcc, other Vdd etc. Same
power supply but different symbols.

Sergey




2006\02\14@235041 by Denny Esterline

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You need to use the "Invoke" command (middle of the left hand column, looks
like four AND gates) to display the other connections. It's useful for
things like adding an individual gate to a schmatic instead of having to
route all the traces back to a multi gate package. Some library parts use it
for the power connections in an effort to simplify the look of a schematic.
That way you can have a group of chip power connections and bypass caps and
such together in the corner of the page instead of having power and ground
lines running every where.

-Denny



On 2/14/06, Rob Robson <spam_OUTrobTakeThisOuTspamsilk.net> wrote:
{Quote hidden}

> -

2006\02\15@015335 by Wouter van Ooijen

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> Here's another head-scratcher from an Eagle novice.  The Vcc
> and ground connections are missing from most of the ICs on my
> board.  They don't appear on the schematic either, although
> they're present in the devices themselves (in the library).  
> This wouldn't be a huge problem if not for the fact that
> Eagle won't seem to let me route traces manually if there
> isn't already an "airwire" connection.  Is there some command
> to make the predefined device power connections appear on the
> schematic and/or the board?

reading the manual? in this case, read about the invoke command. but
IMHO the real solution is to create your own symbols, with alwsys-visble
power connections.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2006\02\15@085021 by Vasile Surducan

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On 2/15/06, Sergey Dryga <.....sdrygaKILLspamspam@spam@nc.rr.com> wrote:
> Rob Robson <rob <at> silk.net> writes:
>
> >
> > Here's another head-scratcher from an Eagle novice.  The Vcc and ground
> connections are missing from most
> > of the ICs on my board.  They don't appear on the schematic either, although
> they're present in the devices
> > themselves (in the library).  This wouldn't be a huge problem if not for the
> fact that Eagle won't seem to let
> > me route traces manually if there isn't already an "airwire" connection.  Is
> there some command to make the
> > predefined device power connections appear on the schematic and/or the board?
>
> I had same problem while ago.  Solution that worked forme is to use the same
> supply symbol as in the device.  Some devices have Vcc, other Vdd etc. Same
> power supply but different symbols.

Using the same supply symbol names as in the device (stored in
different libraries) is impossible for mixed projects.
Learn to use labels in your designs, then any supply part names may be
connected in any way you want.
The ERC will warning you but that's all.
greetings,
Vasile

2006\02\15@124303 by Peter

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On Tue, 14 Feb 2006, Rob Robson wrote:

> Here's another head-scratcher from an Eagle novice.  The Vcc and
> ground connections are missing from most of the ICs on my board.
> They don't appear on the schematic either, although they're present in
> the devices themselves (in the library).  This wouldn't be a huge
> problem if not for the fact that Eagle won't seem to let me route
> traces manually if there isn't already an "airwire" connection.  Is
> there some command to make the predefined device power connections
> appear on the schematic and/or the board?

INVOKE (as in curse, but type it or click it) the chip and a menu will
appear.

Peter

2006\02\15@151015 by Rob Robson

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> INVOKE (as in curse, but type it or click it) the chip and a menu will
> appear.

Thanks very much.

RR

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