Unable to connect j-link on nRF9160 custom board

Does anyone have some troubleshooting tips for how to test a custom board with nRF9160.

It is a new design, the schematic is based on the DK, including the j-link/swd connector.

We have a 3V3 supply.

I have been wondering about the inversion of the SWD RESET signal on the DK board so we implemented the schematic with both inversion and direct connection just to be sure. I assume connection of SWD nRESET signal to pin 32 throuth a 1k resistor with a capacitor is how it should be. 

Is the a guide on checking the CPU bootup etc...?

I have tested by J-Link on the DK by powering it through the external power connector and using the P18 connector. On the DK my J-Link interface connects.

Parents Reply
  • Hi,


    Thomas said:
    But I only measure ~ 1V on the reset pin. I have 3V3 on the VDD_GPIO pin. Looking on the data sheet I belive I should measure around 2.2V. It goes to 0V when debugger is disconnected... (VDD_GPIO still at 3V3)

    If it goes to 0V when the debugger is disconnected, it indicates that the nRF9160 is not powered. This pin should be equal to VDD_GPIO

    Have you checked all solderings and connections towards the nRF9160? Specifically the voltages on VDD1/VDD2 etc?


    Kind regards,