To measure current, you must first prepare the Development Kit (DK).
The suggested configurations split the power domains for the application nRF52832 System on Chip (SoC) and the rest of the DK, and bypass protection components in the power supply chain.
- To put P22 in series with the load, cut the PCB track shorting solder bridge SB9.
- If using an external power supply, short solder bridge SB12 to
bypass the protection diode, which would otherwise give a voltage drop.Note: While SB12 is shorted, the DK must not be powered from the USB if there is an external supply connected because the protection diode has been bypassed.
- To restore normal DK function after measurement:
- Solder SB9 or apply a jumper on P22.
- Cut or desolder SB12 to reconnect the protection diode.
- To reprogram the nRF52832 SoC while the DK is prepared for current measurement, disconnect external supply, ensure there is no battery inserted, remove measurement devices from P22, add a jumper to P22 and then connect the USB cable.
Figure 1. Preparing the DK for current measurements
