Design my own board of nrf52840

[Geass77]

Hello everyone, I wan't to layout my own  PCB board of nrf52840 ,is there any things need to be attention?  By the way, if  I'm not using Interface IMU to  upload my programming code, and how can I directly  program  or upload the softDevice and hexfile on  the nrf52840 cpu?

[haakonsh]

Copy the Reference circuitry exactly, and read this blog: https://devzone.nordicsemi.com/nordic/short-range-guides/b/hardware-and-layout/posts/general-pcb-design-guidelines-for-nrf52. 

Submit your schematic and layout for review in a private ticket when you've copied the reference design.