When designing the Printed Circuit Board (PCB) layout, pin-specific
recommendations should be followed.
The VDD_GPIO pin has the following recommendations:
- Place capacitors C5 and C6 close to the VDD_GPIO pin
for good power delivery.
- Use a track that is wide enough (DCR <0.1 Ω) for VDD_GPIO routing to
minimize voltage drops and unwanted power consumption due to routing losses under high
current conditions.
- Connect capacitors to the same ground plane as nRF9160 (pin 103) using low impedance
ground connections.
- Avoid supply routings close or adjacent to sensitive routings, such as RF.
- Use shielded PCB layers for routings whenever possible to minimize radiated noise.
- Use plenty of ground vias along supply routings to minimize unwanted voltage differences in
the application PCB's metal layers.
- A series solder bridge is recommended in the VDD routing for current
consumption measurements or other diagnostic purposes.