SYSTEM OFF

RE: SYSTEM OFF

Bluesky — Mon, 10 Dec 2018 08:49:51 GMT

Dear Stian,

Thanks for helping. I think I have solved the problem and thanks!

have a nice day:)

RE: SYSTEM OFF

Stian Røed Hafskjold — Mon, 10 Dec 2018 08:33:39 GMT

No, that is not your measurement setup. Your measurement setup is a description of the tools you use to measure, which measurement techniques your are using and how you connect the DUT to your measurement equipment.

Are you using a power analyzer?

Are you using an amperemeter or multimeter?

Are you using a scope with current probe?

Are you measuring voltage drop over resistor?

Are you using the power profiler kit?

Which hardware are you using for the chip? Is this a custom board? If so, please post schematics.

If you are using a development kit, please give me the name of the development kit and the version.

What type of power source are you using? USB, external voltage supply, battery? At which voltage are you powering the board?

Which external components have you connected to the board? Are these always powered? Are you able to measure current without these connected?

How do you connect your measurement device to the board? Which header are you using?

If using a Nordic DK, how did you prepare the board for current measurements? Did you cut any solder bridges? Did you follow the user guide on the infocenter?

I need some more info here, otherwise I'm not able to help you...

RE: SYSTEM OFF

Bluesky — Mon, 10 Dec 2018 03:56:49 GMT

I connect the current measurement device to the nrf52832. This is my measurement setup. Now, I get the current measurement as 1.7uA when I turn everything off. I am still can't get the 0.7uA as mention from datasheet.

RE: SYSTEM OFF

Stian Røed Hafskjold — Fri, 07 Dec 2018 12:09:30 GMT

It's probably the reason. Please describe your measurement setup

RE: SYSTEM OFF

Bluesky — Fri, 07 Dec 2018 01:41:18 GMT

Yes, I am using a DK there are others sensors on top with it. Is this the reason that affect the current draw?

Thanks

RE: SYSTEM OFF

Stian Røed Hafskjold — Thu, 06 Dec 2018 12:18:34 GMT

This is not possible. Then it must be something wrong with your measurement setup.

RE: SYSTEM OFF

Stian Røed Hafskjold — Thu, 06 Dec 2018 12:00:59 GMT

What is your measurement device? What voltage are you using. And is the nRF52832 soldered on to a custom board or are you using a DK. And if you have a custom board, do you have any other external components on the board?

RE: SYSTEM OFF

Bluesky — Thu, 06 Dec 2018 02:28:01 GMT

When I add the for loop <for(;;){__WFE();}> I got a higher current draw compare with the code without the for loop. The current now is about 30uA.

RE: SYSTEM OFF

Bluesky — Thu, 06 Dec 2018 02:11:01 GMT

Hi Stian,

Thanks for helping, my setup for measurement is just connect the current measurement device to my nrf 52832, it there any problem with it? as i can measurement others with this connection, so I think it should be some FM problems.

RE: SYSTEM OFF

Stian Røed Hafskjold — Wed, 05 Dec 2018 12:40:47 GMT

Please add a loop after calling SYSTEMOFF

int main(void)
{
NRF_POWER->SYSTEMOFF = 1;

for(;;){__WFE();}
}

The chip consumes less than 1 uA in System OFF, so if you get 8-9uA there must be something wrong with your measurement setup.