I am wondering at what distance UART lines begin to interfere with each other? And can I expect the UART lines below to function properly? The PCB board below has 6 UART lines running alongside one another (the purple traces).
Some info about the PCB below:
- The purple traces are approximately 1mm apart 0.25mm lines. Except when red UART lines run directly above purple lines. A ground plane is in-between though.
- 4 layer PCB top layer, inner1, inner2, and bottom are signal (red), ground, signal(purple), power planes respectively.
- All planes are filled with a ground layer around the traces.
- The UART lines are at 1.8V.