I have the following board design in mind:
It's a 4 layer, ~5cm diameter board where 10 slave PCB's will be soldered to it that are connected over the I2C bus. The trace line you see is roughly 8 cm in length. This bus has the clock going over the top layer and the data bus over the bottom layer, but I could always change that.
I could also route the traces over 1 layer but use via's to cross each other at the end points, if that makes sense.
As far as I can tell I'm not doing something that is against any I2C "rules" bus I'm also not that familiar with this sort of setup.
The end-point devices will add roughly 150-200 pF total load capacitance to the bus, excluding trace, solder joint and via capacitance. Which as far as I could tell is not a problem since it's far lower than 400 pF already. The bus will be running on 400 kHz.
What method of routing would be recommended here? Am I accidentally designing a radio receiver or worse, a transmitter?
edit: I forgot a case where both are routed on the top layer; Should I match the amount of vias used on both lines even if those vias aren't strictly needed?