Hardware description
Figure 22: Connecting an external board to P20
It is recommended to power the external board separately from the DK. The voltage on the external board
must match that of the DK, which is 3.0 V when the DK is powered through the USB connector.
When the interface MCU detects the voltage of the external board on pin 3 (SWD1_VTG) of P20 it
programs or debugs the target chip on the external board instead of the onboard nRF52832 SoC.
If it is inconvenient to have a separate power supply on the external board, the nRF52 DK can supply
power through pin 2 (VDD) of P20. The connection is shown with a grey outline in Figure 22: Connecting
an external board to P20 on page 24.
Note: If the interface MCU detects boards connected to both P19 and P20, it programs or debugs
the target connected to P19 by default.
CAUTION: To avoid damaging your board, do not connect a separate power supply to the external
board when VDD of nRF52 DK is connected to the external board.
The following section includes an illustration of the P20 connector pinout with a description table.
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