multiple power sources on a single scheme

On 19.04.2016 21:25, Grégoire MATHIEU wrote:

Hi all ! I'm new to eagle, and am trying to create a scheme for a

circuit which have different power sources.

The goal of this circuit is to emulate peripherals with a teensy board,

and for this I need to do logic level translation. The chips that'll do

the translations are bound to be powered from the machine the emulated

peripheral is bound to be connected onto (not sure this is correct

english, TBH).

 

On my first try, I get 4 peripherals to emulate on a single board, and

so I got 5 different power sources (counting the teensy board)

I created different nets for each power source circuit, in order to have

them correctly separated, and by avoiding the usage of the "Vcc"

component.

 

However, when I try to do automatic routing on the generated board, all

chips got their "Vcc" pins connected togother...

 

Is there a way for me to avoid that ?

 

Here is the scheme, exported as an image (didn't find a way to attach

zip or sch files here)

Thanks in advance for your help

 

 

 

--

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Check if your gnd/VCC pins are really connected to the wires in the

schematic and not just accidentially ending there. The ERC will warn

about this, but you can easily check by moving the devices with VCC

around to see if the wire follows. If not, you need to drop it down

again, and it will connect.

There are some "visual issues" in eagle you need to be aware of. I think

most of them happen if you copy and paste, move or bend wires.

You can indeed override implicit power pins (pins defined with

direction=pwr) like you have done. There will be a warning in the ERC

about this, but it's ok to ignore. My ERC lists are usually flooded by

these warnings.

On 19.04.2016 21:25, Grégoire MATHIEU wrote:

Hi all ! I'm new to eagle, and am trying to create a scheme for a

circuit which have different power sources.

The goal of this circuit is to emulate peripherals with a teensy board,

and for this I need to do logic level translation. The chips that'll do

the translations are bound to be powered from the machine the emulated

peripheral is bound to be connected onto (not sure this is correct

english, TBH).

 

On my first try, I get 4 peripherals to emulate on a single board, and

so I got 5 different power sources (counting the teensy board)

I created different nets for each power source circuit, in order to have

them correctly separated, and by avoiding the usage of the "Vcc"

component.

 

However, when I try to do automatic routing on the generated board, all

chips got their "Vcc" pins connected togother...

 

Is there a way for me to avoid that ?

 

Here is the scheme, exported as an image (didn't find a way to attach

zip or sch files here)

Thanks in advance for your help

 

 

 

--

To view any images and attachments in this post, visit:

https://www.element14.com/community/message/195087

Check if your gnd/VCC pins are really connected to the wires in the

schematic and not just accidentially ending there. The ERC will warn

about this, but you can easily check by moving the devices with VCC

around to see if the wire follows. If not, you need to drop it down

again, and it will connect.

There are some "visual issues" in eagle you need to be aware of. I think

most of them happen if you copy and paste, move or bend wires.

You can indeed override implicit power pins (pins defined with

direction=pwr) like you have done. There will be a warning in the ERC

about this, but it's ok to ignore. My ERC lists are usually flooded by

these warnings.

CadSoft Guest a écrit:

 

Check if your gnd/VCC pins are really connected to the wires in the

schematic and not just accidentially ending there. The ERC will warn

about this, but you can easily check by moving the devices with VCC

around to see if the wire follows. If not, you need to drop it down

again, and it will connect.

There are some "visual issues" in eagle you need to be aware of. I think

most of them happen if you copy and paste, move or bend wires.

 

You can indeed override implicit power pins (pins defined with

direction=pwr) like you have done. There will be a warning in the ERC

about this, but it's ok to ignore. My ERC lists are usually flooded by

these warnings.

I just checked that, and they are all connected to their respective nets.

However, I noticed that the Teensy had several GND and Vcc pins. I connected all of them to their respective nets, and now it works !

Thanks all for your help