High Power consumed by nRF52832

RE: High Power consumed by nRF52832

MartinBL — Tue, 27 Mar 2018 11:51:03 GMT

Case closed. Moved to private support.

RE: High Power consumed by nRF52832

MartinBL — Tue, 27 Mar 2018 07:26:34 GMT

At this point I think we will need to see your code to help you further. We can make the case private if you don't want to share it publicly.

RE: High Power consumed by nRF52832

alpeshpatel283 — Tue, 27 Mar 2018 06:19:43 GMT

Hi Martin,

We have updated errata 87 in our firmware but still consumed high current.

We found the following errata also consumed high current, So we need to

1) [97] GPIOTE: High current consumption in System ON Idle mode

2) [89] GPIOTE: Static 400 µA current while using GPIOTE

Can you help how to implementation Workaround in the firmware and how to configure it?

Thanks,

Regards,

Alpesh Mandani

RE: High Power consumed by nRF52832

John — Mon, 26 Mar 2018 13:39:49 GMT

Hi Alpesh,

I can't share my code as it is the property of my employer. That said, you should be able to look at any of the ble_peripheral examples to see advertising setup and idle behaviors using the power_manage function call.

RE: High Power consumed by nRF52832

alpeshpatel283 — Mon, 26 Mar 2018 05:05:52 GMT

Hi John,

Thanks for your support.

We are planing to measure actual current consumption of nRF52832 using example of code to fixe our issue.

Can you please provide example code/Firmware that has to enable radio with fix duration of advertising and scanning mode, SOC enters in sleep/idle mode, SOC enter in normal mode to measure current consumption of custom design system?

Thanks.

Regards,

Alpesh

RE: High Power consumed by nRF52832

John — Fri, 23 Mar 2018 19:24:11 GMT

Hi Alpesh,

While 100ms is a relatively fast advertising interval, it is still a *lot* of time to sleep. The core should still be able to get to idle/sleep mode in that time quite easily.

Regards,

John

RE: High Power consumed by nRF52832

alpeshpatel283 — Fri, 23 Mar 2018 19:20:25 GMT

Hi Martin,

Sure, I will check and apply as per errata workaround.

Thanks,

Regards

Alpesh

RE: High Power consumed by nRF52832

alpeshpatel283 — Fri, 23 Mar 2018 19:16:47 GMT

Hi John,

Thanks for your support. Will check your suggestions and get back to you on further.

Yes, we are not able to put device in sleep/ idle mode.

We have used 100ms advertising interval . Could a small interval effect to core enter in to sleep or idel mode?

Let me know your thoughts on this.

Regards,

Alpesh

RE: High Power consumed by nRF52832

MartinBL — Fri, 23 Mar 2018 16:06:44 GMT

In addition to clearing flags etc. as John DeWitt mentions, this is common cause for the CPU to be running: Errata 87: Unexpected wake from System ON Idle when using FPU. So if you are using float variables in your code make sure to apply the workaround mentioned in the errata.

RE: High Power consumed by nRF52832

John — Fri, 23 Mar 2018 13:13:23 GMT

That current is just about exactly the run current of the CPU while running from flash with the DCDC enabled. Best guess based on what you've told us is that you are not going to idle/sleep, or if you are something is waking you up very quickly after you enter idle/sleep. One thing I would check is to ensure all of your wakeup source interrupt flags are cleared before attempting to idle/sleep.