nRF7002 DK v1.0.0

Programming a board with custom connections

If your external board has custom connections to programming and debugging pins, you can use the debug output on pin list P20.

Connect the boards as shown in the following figure.

Figure 1. Connecting an external board to P20
Connecting a custom 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 1.8V when the DK is powered through the USB connector.

When the interface MCU detects the voltage of the external board on pin 3 (VTG) of P20 it programs or debugs the target chip on the external board instead of the onboard nRF5340 System on Chip (SoC).

If it is inconvenient to have a separate power supply on the external board, the nRF7002 DK can supply power through pin 2 (VDD) of P20. The connection is shown with a grey outline in Connecting an external board to P20.
Note: If the interface MCU detects ground on P19 and power on P20, it programs or debugs the target connected to P19 by default.
To avoid damaging your board, when VDD of nRF7002 DK is connected to the external board, do not connect a separate power supply to the external board.
The following figure shows P20 connector pinouts with a description table.
Figure 2. Debug output connector P20
Debug output connectors P19 and P20 on nRF7002 DK
Table 1. Pinout of connector P20 for programming external targets
Pin number Signal Description
1 nRF7002_IOVDD nRF7002 DK companion IC power domain for current measurement
2 VDD Main nRF7002 DK power domain
3 SWD1_VTG Voltage supply from the external target
4 SWD1_SWDIO Serial Wire Debug (SWD) Data Input/Output
5 SWD1_SWDCLK Serial Wire Clock
6 SWD1_SWO The Serial Wire Output (SWO) line is not needed for programming and debugging over SWD.
7 SWD1_RESET Reset line
8 N.C. Not used
9 VIN 3-5V Voltage supply
10 nRF7002_VBAT nRF7002 DK VBAT power domain for current measurement
11 VBAT Main VBAT power domain
12 VIO_REF GPIO voltage reference input
13 BOARD_ID DK ID resistor