Hello,
I am currently using the nRF52840 Development Kit and was looking to isolate the SoC for power consumption testing. I mainly want to disconnect the integrated MCU and all other parts that may influence current consumption. I had reviewed the post from https://devzone.nordicsemi.com/f/nordic-q-a/35135/totally-isolate-the-nrf52840-on-the-preview-dk and am trailing my thoughts from the discussion I had read.
So per the post above and what I read from the datasheet...
- I supply P21 by an external 3V power supply on P21
- I set SW9 to "VDD"
- I set SW10 to "VEXT->nRF"
- I set SW6 to "nRF ONLY"
- I disconnected SB50~57 from the interface MCU
- I disconnected SB16 from the internal memory (just in case)
- I disconnected SB58 from the voltage follower for a more realistic current reading when mounted on a PCB
Is there no way to completely isolate the SoC from the rest of the programming board? Are the floating IC switches the issue?
Or is there a way to minimize the effects of the MCU as much as possible?
I am eager to begin using this board by directly communicating with the nRF52840 SoC exclusively.
Best.
Dennis
