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?

[Ekmekci]

Hello,

You should care ProductSpecification of nRF52840. 

This IC have 6 different schematic and layout according to which feature you will use (NFC,USB) and what will be your power supply (less than 3.6 or greater than 3.6)

When you select one of 6 designe, you just follow schematic it is enough.

About download your firmware into IC, you have to use Vdd,SWDIO, SWDCLK, GND. You can change firmware download type using this SWD interface.

After first time program your IC there is 3 different programming method.

1) Standard SWD interface (which i mentioned above)

2) nRF52840 have USB support. You can download your USB bootloader code into IC and after this step you can program your IC via USB.

3) You can use DFU OTA, Its mean you can use Bluetooth (no need any wire) for download your firmware into IC. It need DFU bootloader. After you download DFU bootloader code into IC. You can use Bluetooth for program your IC.