Is there any problem in current consumption of nRF52-DK when SB9 is not opened ?

RE: Is there any problem in current consumption of nRF52-DK when SB9 is not opened ?

Daewoong Kim — Thu, 02 May 2019 02:54:38 GMT

Thank you for your reply!

RE: Is there any problem in current consumption of nRF52-DK when SB9 is not opened ?

Daewoong Kim — Thu, 02 May 2019 02:54:00 GMT

When i use multi-meter to measure current after cutting SB9, current consumption is remarkably dropped, and IDLE current is observed about 2~3uA !

RE: Is there any problem in current consumption of nRF52-DK when SB9 is not opened ?

Stian Røed Hafskjold — Tue, 30 Apr 2019 11:02:27 GMT

When you measure current going into P21, you will power all the other components on the board as well, including the Segger chip (debugger), this will consume a lot of current. To isolate the nRF52 from the rest of the board, only measuring the nRF52 current, cut SB9 and measure current going though P22.

RE: Is there any problem in current consumption of nRF52-DK when SB9 is not opened ?

wlgrd — Tue, 30 Apr 2019 09:13:09 GMT

No, it doesn't matter.
SB9 is cut when you want to measure current over P22, using a scope over R6 or an amperemeter (or the Power Profiler Kit).

I would advise to solder SB12 to bypass the protection diode D7 when using the SMU at P21 though. Just remember that the external supply is not protected against reverse voltage when a USB is used for powering the DK then.