Use external JLINK to download the program to the 52840DK board

[ArchieL]

Hi 

When using external JLINK to download programs to 52840DK board, how should power supply, or how should configuration;
What problems should you pay attention to when using JLINK download program on your own designed board?
thank you

[Amanda Hsieh]

Hi, 

Please see the Debug input and trace documentation. 

-Amanda H.

[ArchieL]

Hi Amanda,There is another problem. My board SWDIO and SWDCLK output 1.8V, which seems to cause my board and JLINK to fail to match.
1. I designed according to the reference design. What could cause my board SWDIO and SWDCLK to output 1.8V,
2. JLINK voltage does not match, how to solve it

[Amanda Hsieh]

Hi Archie, 

Is it possible to share the schematic of your board?

-Amanda H. 

[ArchieL]

I have solved this problem. It is the power supply design that causes the voltage mismatch.
Thank you

[TANGyouyou]

I'm sorry to bother you, but now I have the same problem as you. My NRF52840 uses 1.8V voltage, which means that the voltage of my SWDIO SWDCLK is 1.8V. And my Jlink is 3.3V, could you please tell me how to solve this problem so that JLink can work normally and download the program to NRF52840 successfully through Jlink?Looking forward to your reply. Thank you