Hardware description
Figure 19: Debug output connector
When the external board is powered, the interface MCU detects the supply voltage of the board and
programs/debugs the target chip on the external board instead of the onboard nRF52832 SoC.
Note: The voltage supported by external debugging/programming is 3.0 V.
You can also use P20 as a Debug out connection to program shield-mounted targets. For the Debug out
header (P19), the interface MCU detects the supply voltage on the mounted shield and programs or
debugs the target.
If the interface MCU detects target power on both P19 and P20, it programs or debugs the target
connected to P19 by default.
4.9 Connectors for programming external boards
The tables describe pinouts of connectors P19 and P20. The voltage on the external board must match
that of the DK.
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