The tables describe pinouts of connectors P19 and P20. The voltage on the external board must match that of the Development Kit (DK).
| Pin number | Signal | Description |
|---|---|---|
| 1 | EXT_VTG | Voltage supply from the external target, used as a select pin for the interface MCU to enable this port |
| 2 | EXT_SWDIO | Serial Wire Debug (SWD) data line |
| 3 | GND | Ground |
| 4 | EXT_SWDCLK | SWD clock line |
| 5 | GND | Ground |
| 6 | EXT_SWO | The Serial Wire Output (SWO) line is not needed for programming and debugging over SWD |
| 7 | N.C. | Not used |
| 8 | N.C. | Not used |
| 9 | EXT_GND_DETECT | Ground detect |
| 10 | EXT_RESET | Reset line |
| Pin number | Signal | Description |
|---|---|---|
| 1 | VDD_nRF | nRF52833 SoC power domain |
| 2 | VDD_nRF’ | Main nRF52833 DK power domain |
| 3 | SH_VTG | Voltage supply from the external target, used as a select pin for the interface MCU to enable this port |
| 4 | SH_SWDIO | SWD data line |
| 5 | SH_SWDCLK | SWD clock line |
| 6 | SH_SWO | The SWO line is not needed for programming and debugging over SWD |
| 7 | SH_RESET | Reset line |
| 8 | SH_GND_DETECT | Ground detect |
| 9 | VIN3-5V | Voltage supply |
| 9 | VDD_HV | Used for current measurement |
| 10 | VDD_HV’ | Used for current measurement |
| 12 | VIO_REF | GPIO voltage reference input |
| 13 | ID | DK ID resistor |