Multiple Supply

Naoya Yamada schrieb:

I'm drawing some schematics, and I want to use multiple supplies, eg.

VCCINT, VCCAUX, VCCIO, VCCDDR, VTTDDR, VREFDDR, ..., in them.

What is the most simple way to do it?

(I googled and found some old pages. Thats said "define each supply

symbols", but it's a so crazy way! It makes my library large and

complex.)

You don't need to use supply symbols.

Net names are global. Simply name your nets correctly and LABEL them for

clarity and documentation.

Tilmann

Tilmann Reh wrote:

Naoya Yamada schrieb:

I'm drawing some schematics, and I want to use multiple supplies, eg.

VCCINT, VCCAUX, VCCIO, VCCDDR, VTTDDR, VREFDDR, ..., in them.

What is the most simple way to do it?

(I googled and found some old pages. Thats said "define each supply

symbols", but it's a so crazy way! It makes my library large and

complex.)

 

You don't need to use supply symbols.

 

Net names are global. Simply name your nets correctly and LABEL them for

clarity and documentation.

I find it much to error prone using labeled nets for power supply.

I don't mind creating special supply symbols as needed. It may be a

bit of work initially, but as soon as you have a set of them ...

Supply symbols have the big advantage to look like what they are.

And even more important: they rename the nets they are connected to.

--

Lorenz

Thank you for your reply, Tilmann and Lorenz.

Hmm, global net name may work fine for my purpose.

But as Lorenz says, supply symbols look like what they are, and it's the big advantage.

Now I think placing symbol (the shape is supply symbol, but it doesn't have any pin) at the end of the supply nets is temporary solution...

naoy-y

Naoya Yamada wrote:

Thank you for your reply, Tilmann and Lorenz.

 

Hmm, global net name may work fine for my purpose.

But as Lorenz says, supply symbols look like what they are, and it's the

big advantage.

Now I think placing symbol (the shape is supply symbol, but it doesn't

have any pin)

but then you have to name the net manually, and always make sure, that

the (pinless) symbol matches the net name.

And the net name is the crucial point here.

A normal supply symbol (with pin direction 'sup' that is) will rename

the net it gets connected to.

And if you connect different supply symbols to the same net you will

get a warning.

--

Lorenz

The best way is to use the symbol which display the connected net name automatically, I think.

(And it's possible with other PCB CAD software e.g.. DesignSpark PCB... But with Eagle, We cannot define symbol only device, or display net name, which connected to a pin.)

To define the symbols for each supply is very unproductive, and I'll never use that way.

naoy-y