The power for the interface MCU is routed through two load switches: one for the VDD supply and one for the Universal Serial Bus (USB) supply. This makes it possible to disconnect the interface MCU from the power domain when it is not in use.
Figure 1. Interface MCU power switch
These switches are controlled by a USB connected to the interface MCU USB connector J2 and the state of the nRF ONLY switch SW6. For more information, see Modes of operation.