I am designing an SMD PCB to control two motors that consume 6 A each. I have too many components and I am using 4 layers, so I want separate the tracks. I have found out that the tracks with high current must be in a external layer. I have been thinking in use this organization layers:
- Layer 1: Power.
- Layer 2: GND.
- Layer 3: Communication signals (signals that changes their value in very short time, thus are very sensible to noise, for example Serial communication of ESP32 or PWM).
- Layer 4: Control signals (digital pins that change their value between Vcc and Gnd but keep their value steady by a long time, for example the control of a LED).
I want to use a ground plane but in an internal layer, because I found that the ground must be near of the rest of signals.
