Possible bug with 8.2.2

[t.zibrat]

I have a part that I created that has 2 pins labeled 5V.  These pins are unused so there is no connection to them.

I created a PCB with a 5V plane, the unused and unconnected pins on the part above are automatically connected to the 5V plane.  This is undesired behavior.

You can the schematic symbol on top has no connection to the 5V pins but the PCB on the bottom has a connection to the 5V plane (in blue).

This seems to be a new feature in 8.2.2 that was not in 8.2.1.

This is very undesirable behavior, the only way to prevent this is to add a net to the schematic that is named something else.

For an experiment, I added a small SOT23 part from the library into my schematic.  I did not connect any pins and yet in the PCB, the GND pin is automatically connected to the GND plane I have on my board (see below in red).

[edwin.robledo · Accepted solution]

Hi t.zibrat,

As far as I know this is the way EAGLE has always treated power pins.  Power pins continue to carry their signal property even if they are not connected. If you have a situation in which you have multiple pads assigned to the same Power pins, then you need to change the Append status. 

One solution is to connect them to a different signal on the board, or change the pin direction in the library editor to something other than Power or Supply.

I hope this helps.

Best Regards,

Ed

[t.zibrat]

Yes, I see that is how it works now, I didn't realize this and I'm glad I found out before I had boards made.

I still think this is undesirable however.  If there are no connections to a pin in the schematic then there should not be any connections to the pin in the PCB regardless of the pin name or planes present on the PCB.  This is how all other schematic capture software behaved that I have used in the past.

Of course, this is my opinion for what it is worth.  I still enjoy using the Eagle software and will continue to use it.  I'm still learning all of the inherent behaviors of it.

Thanks for the quick reply and keep up the good work!