Use the nPM2100 EK with the nRF52840 DK

nPM2100 EK Hardware

The nPM2100 EK can power the nRF52840 System on Chip (SoC) as a host device on the nRF52840 Development Kit (DK).

Note: The EK powers only the nRF52840 SoC on the DK. To access the nRF52840 DK features, such as programming and debugging, the IMCU on the DK must be externally powered.
  1. Connect the nPM2100 EK to the nRF52840 DK as shown in Connections between nPM2100 EK and nRF52840 DK.
  2. On the DK, make sure the VEXT→nRF switch SW10 is in the ON position.
    This connects the external supply to VDD. In this case, this connects the external supply to VOUT on the Power Management Integrated Circuit (PMIC).
  3. On the DK, make sure the nRF POWER SOURCE switch SW9 is in the VDD position.
    This ensures that only the nRF52840 circuitry is powered from VDD.
  4. To program and debug nRF52840 SoC, connect a USB cable to the USB port J2 on the DK.
    This only powers the IMCU used for flashing and debugging.
  5. On the EK, disconnect the USB-C cable from J4 to put the EK in standalone mode.
    This disables the nPM Controller.
  6. Insert a battery in the battery add-on board, ensuring correct polarity.
  7. To power the EK, plug the battery add-on board in the EK socket at P4.
  8. Slide switch SW5 to VBAT.
Note: The nRF52840 host device and the nPM2100 PMIC have the same I/O reference level.
The following table shows the connections between the EK and the nRF52840 DK.
Table 1. Connections between nPM2100 EK and nRF52840 DK
Function nPM2100 EK nRF52840 DK Comment
Pin name Location Pin name Location
Power VOUT P11, pin 3 External supply + (positive) P21, pin 1 1.8 V, change jumper on VSET to 1.8 V
GND P11, pin 4 External supply - (negative) P21, pin 2 Ground
TWI SCL P11, pin 2 P1.26 P4, pin 9 Connect to a TWI compliant GPIO on DK
SDA P11, pin 1 P1.27 P4, pin 10 Connect to a TWI compliant GPIO on DK
GPIO GPIO0 P12, pin 1 P1.10 P4, pin 1 Connect to a GPIO on DK
GPIO1 P12, pin 2 P1.11 P4, pin 2 Connect to a GPIO on DK