I need some help figuring out how to manage the mounting holes in my PCB. Searching the internet you will find a lot of information, but it is all confusing and often contradictory. I state that it is a low frequency board (MCU + some SPI and I2C) The first question is of course, how to ground them? The most popular answers are:
- DO NOT ground them
- Ground them all
- Connect only one to ground and leave the others isolated
- Connect them together but do not connect them to the ground plane
- Ground them with a capacitor to ground
But I can't figure out what solution I need to apply. Can anyone help me?
My idea is to connect all the fixing holes to each other through a trace along the edge, as in this figure, then in the 4 corners put 4x 0603 land pattern on which, if necessary, connect a 0 ohm resistor to connect or not all the grounding holes, see figure. It could be a good idea? Or is it better to connect all holes directly to the ground id plane?