nRF52840 DK v1.0.0

nRF only mode

The nRF only mode disconnects the power supply of the interface MCU, the external memory, and the LEDs as well as disconnects the signal lines between the nRF52840 system on chip (SoC) and the interface MCU using analog switches.

This is done to isolate the chip on the board as much as possible, and can be of use when measuring currents on low-power applications.

The power supply of the external memory can be changed to maintain operation in the nRF only mode. See section External memory.

Figure 1. nRF only switch (SW6)
nRF only switch (SW6) on nRF52840 DK