I will design custom pcb for nrf52840.

[electric eye]

Hi everyone,

I want to design PCB for nrf52840. Do you have any suggestions before i start? 

I used STM32, PIC, Nuvoton and Atmel series IC's in my PCBs. But nrf52840 will be first time. What do i need to pay attention to? If you share some documents with me, i would be glad. 

Thank you.

[Kenneth]

Hello,

I see you have a duplicate case, but the most important can you find in the PCB guidelines chapter:
https://infocenter.nordicsemi.com/topic/ps_nrf52840/ref_circuitry.html#concept_hf5_hzm_fs 

Make sure to follow the reference layout closesly, with the same placement of components, clearance to ground layer, cut out and vias especially around the ANT pin. Also make sure that when placing the antenna that it's placed typically to the edge of the PCB, and that you add some pi-network close to the antenna so it can be tuned to 50ohm. The actual and optimum values in the pi-network must be found by measuring on the actual pcb with casing.

Kenneth