Several ground nets

On 04/07/2011 07:51 AM, Marco Trapanese wrote:

Hello,

 

in my current design I need a lot of ground nets, each one isolated from

the others.

For example: I use 8 ADM3251. The isolated side should be not connected

to the isolated side of another AMD3251.

 

I also use 8 digital isolator and so on...

 

 

Ok, I could draw a net without any ground symbol but it's not very clear

to read.

 

So, how to draw the same supply pin (e.g. AGND) but with a different

name so they won't be connected together?

Look in supply2.lbr.  There are several ground symbols labeled 0V, AGND,

DGND, GND, GND1, GND2, etc.

Enjoy,

    - Chuck

Marco Trapanese wrote on Thu, 07 April 2011 07:51

So, how to draw the same supply pin (e.g. AGND) but with a different

name so they won't be connected together?

There are a bunch of examples in my POWER library included in the Eagle

Tools release at http://www.embedinc.com/pic/dload.htm.

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

Marco Trapanese wrote:

Hello,

 

in my current design I need a lot of ground nets, each one isolated from

the others.

For example: I use 8 ADM3251. The isolated side should be not connected

to the isolated side of another AMD3251.

 

I also use 8 digital isolator and so on...

 

 

Ok, I could draw a net without any ground symbol but it's not very clear

to read.

 

So, how to draw the same supply pin (e.g. AGND) but with a different

name so they won't be connected together?

 

In that case naming them might be best. Maybe SYSGND, and then ISOGND1,

ISOGND2 and so on. Always think about that archaeologist finding the

time capsule with your schematic in 500 years, he needs to understand

--

Regards, Joerg

http://www.analogconsultants.com/

Il 07/04/2011 15:30, Chuck Huber ha scritto:

Look in supply2.lbr.  There are several ground symbols labeled 0V, AGND,

DGND, GND, GND1, GND2, etc.

Yes, but I don't want to use 20+ different symbols. May I just rename

the nets?

Marco

Il 08/04/2011 16:04, Olin Lathrop ha scritto:

There are a bunch of examples in my POWER library included in the Eagle

Tools release at http://www.embedinc.com/pic/dload.htm.

Thank you!

Marco

Marco Trapanese wrote:

Il 07/04/2011 15:30, Chuck Huber ha scritto:

 

>> Look in supply2.lbr.  There are several ground symbols labeled 0V, AGND,

>> DGND, GND, GND1, GND2, etc.

 

Yes, but I don't want to use 20+ different symbols. May I just rename

the nets?

 

Ideally yes but I have tried that with power symbols and just renaming

in the schematic messed up the PADS netlist. So I made library parts for

all the voltages I usually need, all with the same symbol.

It's not that big a deal. For example, you could make a library

"trapanesesupply.lib", then add a dozen grounds. A normal one, then

ISO1, ISO2 and so on. In my experience it makes schematics easier to

read for others if the isolated grounds have a more unusual ground

symbol (but all of those have the same type of symbol).

--

Regards, Joerg

http://www.analogconsultants.com/

Il 10/04/2011 20:56, Joerg ha scritto:

It's not that big a deal. For example, you could make a library

"trapanesesupply.lib", then add a dozen grounds. A normal one, then

ISO1, ISO2 and so on. In my experience it makes schematics easier to

read for others if the isolated grounds have a more unusual ground

symbol (but all of those have the same type of symbol).

Yes. It's exactly what I want and what I was going to do.

Because all of them shares the same symbol I was wondering if I may

avoid to create n symbols, but only changing their names.

Anyway the straight way seems the better one!

Thanks

Marco

Marco Trapanese wrote:

>Il 07/04/2011 15:30, Chuck Huber ha scritto:

>> Look in supply2.lbr.  There are several ground symbols labeled 0V, AGND,

>> DGND, GND, GND1, GND2, etc.

>Yes, but I don't want to use 20+ different symbols. May I just rename

>the nets?

supply symbols use a special kind of pins that rename the net they get

connected to.

You can rename the net again though, but then you will get into deep

s... really fast 8-)

So the only clean way for using supply symbols is to create one for

every separate supply net you need.

--

Lorenz

On 4/10/2011 1:34 PM, Marco Trapanese wrote:

Il 08/04/2011 16:04, Olin Lathrop ha scritto:

 

>> There are a bunch of examples in my POWER library included in the Eagle

>> Tools release at http://www.embedinc.com/pic/dload.htm.

>

Thank you!

 

Marco

Hi Marco,

I hope you are doing well. Try the new make-supply-symdev.zip that's up

on our website. It's a simple ULP which creates a variety of supply

symbols, it should speed up your work considerably.

hth,

Jorge Garcia

Il 11/04/2011 10:15, Lorenz ha scritto:

So the only clean way for using supply symbols is to create one for

every separate supply net you need.

Ok, thank you for the clarification!

Marco