When designing the Printed Circuit Board (PCB) layout, interface-specific
recommendations should be followed.
The COEX interface has the following recommendations:
- Place filtering series resistors close to the respective COEX pins.
- Place capacitors close to the origin of noise.
- Ground capacitors to the same ground plane as VSS (pin 103).
- Avoid routing COEX close to sensitive routings due to the risk of noise
decoupling from COEX.
- Avoid routing COEX close to supply or RF routings due to the risk of noise
decoupling to COEX.
- Use shielded PCB layers for General-Purpose Input/Output (GPIO) routings whenever possible to
minimize radiated noise.
- Follow the instructions in the peripheral datasheets.