Does both GND's of atmega168 need to be connected?

Community PCB Design
1

I’ve made a design, and after making a board from it I have come to the point where the layout is where I want it except the PIN23 GND has no connection to ground. PIN3 GND still has connection as normal. I have tried starting again, but end up with more problems so Im thinking I may just remove that pin from ground.

Thanks, Philip

2

All ground and supply pins MUST be connected! That includes AVcc.

Leon

3

Thanks Leon, managed to sort it with some re-jiggery. A problem Im having is trying to implement a LM2576 and the design is passing DRC now with exception to all the pads of the 2576 being merged together. It looks fine in the editor, I have even tried reducing the pad size but it still merges them in the board layout.

Any ideas?

Ta

4

Sorry, I don’t use Batch-PCB.

Leon

5

The OP hasn’t mentioned Batch-PCB…

Have you had a look at the properties of the pins in the symbol editor?

What about the automatic pad sizing in the DRC?

Got a sceen-cap of what you’re seeing?

6

You also need to feed all of the VCC pins and AVCC. Even if you aren’t using the ADC, AVCC powers all of the port A I/O.

7

Hi, I managed to sort it by moving the pads 0.0125 apart, I may have to bend the leads but I now get no DRC errors. I will take a screenshot and upload the library when I get home.