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Queries and Programing Interface for nRF52840 custom Board

Moghees

We want to use nRF52840 SoC as our controller in our custom Board. I have reviewed the product specification document of nrf52840. I have following queries:

  1. Is High Voltage mode only used when we want to operate nRF52840 SoC with Li-Po Batteries or 5V DC source directly?
  2. Is there any other use of High Voltage Mode?
  3. In Normal Voltage mode can we run nRf52840 SoC with 3.6V DC source?
  4. For programing custom nRF52840 board using nRF52840 DK, we have to supply VDD pin on custom board with 3.0V?
  5. Is the below mention block diagram for programing nRF52840 custom board using nRF52840 DK correct?

Regards,

Moghees Bin Zahid

  • 0

    Hi,

    • Is High Voltage mode only used when we want to operate nRF52840 SoC with Li-Po Batteries or 5V DC source directly?

     High voltage mode is used when the voltage of your supply is outside the operating region of normal mode or you want to supply an external device from VDD

    • Is there any other use of High Voltage Mode?

     See my previous answer.

    • In Normal Voltage mode can we run nRf52840 SoC with 3.6V DC source?

     Yes, but it's right at the limit. Might be better to just use High voltage mode if the voltage isn't exactly 3V6 but maybe a bit higher. 

    • For programing custom nRF52840 board using nRF52840 DK, we have to supply VDD pin on custom board with 3.0V?

     Yes, the board has to be supplied with 3V0. That's the only voltage supported by the onboard debugger. 

    1. Is the below mention block diagram for programing nRF52840 custom board using nRF52840 DK correct?

     Yupp pretty much.

    regards

    Jared 

  • 0 in reply to Jared

    Thanks for the reply. If we want to use High Voltage mode. Then In order to program custom board, we should connect VDD of DK with VDDH pin of custom board? Is there any other difference in connection for nRF52840 SoC used in high voltage mode

  • 0 in reply to Moghees

    What voltage do you want the board to run at in high voltage mode? 

  • 0 in reply to Jared

    We want to run board at 5V. Just to clarify my question I want to know how to program our custom Board if we want to run nRF52840 custom board in high voltage mode  

  • 0 in reply to Moghees

    Hi,

    If you want to program a board that runs on 5V then the sketch that you shared is not correct. The interface only supports 3V. You can try:

    1. Supply the custom board with 5 V at VDDH
    2. Change REG0 output so that the VDD voltage is 3V. Default is 1V8
    3. Connect VTG to VDD on the nRF52840 board
    4. SWDIO and SWDCLK and GND should be connected as before

    It is the output from REG0 which decides the VDD voltage which is what relevant for the SWD programming.

    regards

    Jared

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