https://devzone.nordicsemi.com/f/nordic-q-a/126647/power-supply-problem-when-using-nrf5340dk-to-debug-external-boardHello, I am writing to ask a question regarding the power supply configuration when using an external board with the nRF5340DK. I am referring to page 30 of the nRF5340DK User Guide, and there is a section that seems slightly ambiguous to me. en-USTelligent Community 13Thu, 22 Jan 2026 14:53:46 GMThttps://devzone.nordicsemi.com/thread/559385?ContentTypeID=1Thu, 22 Jan 2026 14:53:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3b3637a0-0e5e-401d-ab04-8756cfdcba59Menon<p>Hello,</p> [quote user=""]Does the caution note in the yellow section apply only when I am powering the external board using the DK&#39;s VDD?[/quote] <p>This is correct, what you have marked in yellow applies only when the nRF5340 DK is used as the power source for the external board via the DK’s VDD pin (P20 pin 2).&nbsp;&nbsp;Or if the DK and the external board are powered from different &nbsp;supplies, then there’s no issue with the external board drawing high current, and the yellow 100 mA caution does not apply.</p> <p>Kind Regards,</p> <p>Abhijith</p><div style="clear:both;"></div>