How to put nrf52832 in sleep mode?

RE: How to put nrf52832 in sleep mode?

swetha Paladugu — Fri, 24 Sep 2021 11:15:06 GMT

Ok i will check that.

RE: How to put nrf52832 in sleep mode?

Simonr — Fri, 24 Sep 2021 10:54:04 GMT

Sorry about that, my last reply has been updated now.

RE: How to put nrf52832 in sleep mode?

swetha Paladugu — Fri, 24 Sep 2021 09:36:07 GMT

Ok can you please point me to the guide where i can find those details?

RE: How to put nrf52832 in sleep mode?

Simonr — Fri, 24 Sep 2021 09:08:12 GMT

No, you won't be able to advertise while in low power mode. You can check out the guide for optimizing power on nRF52 designs here for more details on what you can do to minimize current consumption during advertising (lowering TX power and tweaking advertising parameters for instance).

Best regards,

Simon

RE: How to put nrf52832 in sleep mode?

swetha Paladugu — Thu, 23 Sep 2021 13:38:56 GMT

Hi,

My application needs the BLE to be always advertising, so that my central device can connect to it at any point of the time and send data.

I cannot wake up with a gpio interrupt and advertise for a certain time as u suggested.

So there is no way i can keep my device in low power mode?

Thanks,

Swetha.

RE: How to put nrf52832 in sleep mode?

Simonr — Thu, 23 Sep 2021 11:14:04 GMT

In the nRF52832 product specification the various sleep modes are mentioned under the current consumption scenarios labeled as "Ultra-low power". In general, there are two "main" sleep modes. System ON (when the CPU is idle in its least power consuming state) and system OFF (when the CPU shuts off completely). There are pros and cons to both of these. The system ON mode will consume somewhat more current than system OFF mode but will be able to keep I.E. a timer running so you can wake it up after X amount of time. System OFF mode will provide the absolute lowest power consumption, but will require an external source to wake it up, like a button or NFC field for instance.

As for the "always advertising" part of your question, the radio peripheral will be off when the CPU is asleep, as it is consuming quite a lot of current by itself, so this won't be possible. You can make it wake up and advertise for a set amount of time each time it receives a GPIO interrupt, but it won't be advertising while sleeping.

Check out the sleep_mode_enter() function in our SDK (present in most example projects) for system OFF mode sleep mode, and idle_state_handle() function in our SDK (present in most example projects) for the system ON mode sleep mode.

Best regards,

Simon