nRF21540 DK v1.0.0

Interface MCU

The interface MCU on the nRF21540 DK runs SEGGER J-Link OB interface firmware and is used to program and debug the firmware of the nRF52840 System on Chip (SoC).

Figure 1. Interface MCU
nRF21540 DK: USB for interface MCU, interface MCU, LED5, power switch, and IF Boot/Reset button