When designing the Printed Circuit Board (PCB) layout, pin-specific recommendations
should be followed.
The General-Purpose Input/Output (GPIO) pins have the following recommendations:
- Place filtering series resistors close to the respective GPIO pins.
- Place capacitors close to the origin of noise and ground them to same ground plane as
VSS on nRF9160.
- Avoid parallel routing of GPIOs close to sensitive RF routings due to the risk of noise
decoupling from GPIO to RF routing.
- Avoid parallel routings of GPIOs close to supply or RF routings due to the risk of noise
decoupling from other routings to the GPIO routings.
- Use shielded PCB layers for GPIO routings whenever possible to minimize radiated noise.
- Follow the instructions in the peripheral datasheets.