Current measurements on nrf52840 pdk with PPK

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 13 Nov 2017 15:55:12 GMT

Thanks guys, i appreciate all your help.

RE: Current measurements on nrf52840 pdk with PPK

Stian Røed Hafskjold — Mon, 13 Nov 2017 15:38:23 GMT

Yes you can apply a jumper on p22 and p23 or solder SB40 and SB41, whatever is easiest.

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 13 Nov 2017 15:14:18 GMT

Well my problem was in system OFF mode. I cutted SB41 and now its 2,5µA. Now to To restore normal kit function after measurement what should i do? should i apply a jumper on P22 and P23? or just Solder bridge SB40 and SB41

RE: Current measurements on nrf52840 pdk with PPK

Stian Røed Hafskjold — Mon, 13 Nov 2017 14:48:50 GMT

Yes, logging enabled will increase the current consumption in system ON idle mode (between the BLE advertising events) because the UART peripheral is powered on. In system OFF mode logging will not have an impact on current consumption.

I tried with Bjørn's hardware now, and I also got 40µA. The reason for this is that SB41 is not cut, and the chip is powered through the high voltage pins, which in combination with the PPK gives wierd results.

Try to cut SB41 (in addition to SB40) and see if that helps. I can not find this documented in either the PKK or PDK user guide, which is not good, so we're sorry for wasting your time.

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 13 Nov 2017 14:17:48 GMT

Yes, NRF_LOG_ENABLED is 0, but do you think that logging will be active in sleep mode? did you tested my hex file? what is the current avrage with PKK and multimeter in sleep mode?

RE: Current measurements on nrf52840 pdk with PPK

Stian Røed Hafskjold — Mon, 13 Nov 2017 14:02:09 GMT

OK, I'm not able to reproduce it here, but I will try with Bjørn's hardware and get to the bottom of this. Will let you know when I figure it out.

And just to check; Bjørn also mentioned logging. I just want to make sure that you have NRF_LOG_ENABLED set to 0 in your sdk_config.h

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 13 Nov 2017 13:40:13 GMT

Now i tested another PDK (pca 10056, v0.9.2, 2017.33) and i got the same result

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 13 Nov 2017 10:52:36 GMT

Bjørn Kvaale had the same results.

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 13 Nov 2017 10:49:36 GMT

you can test any example in sdk14.0 or sdk 14.1 the result will be 40 40µA in sleep mode. I dont know how to attach the hex file in the comment so i attached it in the original question at the first line

RE: Current measurements on nrf52840 pdk with PPK

Stian Røed Hafskjold — Mon, 13 Nov 2017 10:41:21 GMT

No sorry, the original code.

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 13 Nov 2017 10:38:38 GMT

The hex file forthe above code?

RE: Current measurements on nrf52840 pdk with PPK

Stian Røed Hafskjold — Mon, 13 Nov 2017 10:36:58 GMT

Hmm ok, so that was the 4th outcome I guess... Which does not make any sense. But anyways, since the PPK shows low current now, I think we can assume that the issue lies with the original code. Can you please post the hex file so I can try to measure it here?

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 13 Nov 2017 10:19:16 GMT

Hi Stian, The code does not reduce current on multimete but it reduce on PKK to 2,5µA!

RE: Current measurements on nrf52840 pdk with PPK

Stian Røed Hafskjold — Fri, 10 Nov 2017 14:21:44 GMT

Hi, can you check with a regular multimeter on P22 (current measurement pin) on the DK to see if it actually is 40µA? Just so we know if there's an issue with the PPK or the DK.

Also run just this code:

int main(void){
    NRF_POWER->SYSTEMOFF =1;
    while(true){__WFE();}
}

Then you have 3 outcomes:

The above code reduces current on both PPK and multimeter: There's an issue with the original code
The above code reduces current on only the multimeter, not the PPK: There's an issue with the PPK
The above code does not reduce current on multimeter. There's an issue with the PCA10056.

RE: Current measurements on nrf52840 pdk with PPK

nahro — Thu, 09 Nov 2017 14:31:26 GMT

This link did not help,did you checked my board ?

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 06 Nov 2017 15:21:52 GMT

PCA10056 V0.9.1 2017.14 683393891

RE: Current measurements on nrf52840 pdk with PPK

Bjørn Kvaale — Mon, 06 Nov 2017 15:18:51 GMT

Which nrf52840 pdk version do you have? What does it say under PCA 10056 on the MCU of your PDK? Is it <=0.9.3 on the second line & then 2017.39 for example on the third line? Have you taken a look at this case?

RE: Current measurements on nrf52840 pdk with PPK

nahro — Mon, 06 Nov 2017 13:42:37 GMT

Hi Bjørn, did you figured out the problem?

RE: Current measurements on nrf52840 pdk with PPK

nahro — Thu, 02 Nov 2017 10:58:48 GMT

hi Bjørn, I tested (ble_app_queued_writes and ble_app_hrs) the average is 40uA in sleep mode.

RE: Current measurements on nrf52840 pdk with PPK

Bjørn Kvaale — Thu, 02 Nov 2017 10:36:02 GMT

Hi Nahro. Just ran the ble_app_gls application on my nrf52840 pdk. Got an average of 40 uA when sleeping and 1.3 mA when advertising. I have not made any modifications to the code yet. Let me get back to you soon.