Minum requirements to flash NRF52840 on custom board

[enny]

Hello,

I have created a custom board that uses a NRF52840. 

From my understanding, i'm need only VDD,GND,SWDIO and SWCLK connected to the SOC to flash them by using an erxternal J-Link.

But i have no succes. So i will ask there, what are the minimum circurit requirements to flash the SOC. 

Please Help.

Regards Enny

[Simonr]

Hi

From what I can see, this circuit should be programmable. Are you sure the chip has been soldered correctly? The nRF52840 is a tricky one to solder properly. There might also be a problem with your J-Link device. Are you able to program any other devices with it?

Best regards,

Simon

[enny]

Hello Simonr,

you are right. The soldering of the chip was the reason. Yes its a verry tricky one. After some try's we got some working. Thank you for your support.

regards Enny