The nRF54LM20B SoC can be powered directly from an external power source with the rest of the nRF54LM20 DK being powered through the J3 or J4 USB connectors. This enables external supply for the nRF54LM20B SoC while serial interfaces, LEDs, and buttons remain functional.
Remove the jumper from P14 and connect an external power source to the P14 header. The allowed voltage range is from 1.7 V to 3.6 V.
Ensure that the nRF54LM20 DK is powered through J3 or J4 before powering on the nRF54LM20B SoC through the P14 external supply header to avoid damaging the onboard circuitry.
Figure 1. External VDD:nRF supply
