How to reduce power consumption when using only MCU with no communication

RE: How to reduce power consumption when using only MCU with no communication

Hung Bui — Mon, 17 Jul 2023 07:26:58 GMT

Hi Philippe,

On the nRF52, if you don't use a peripheral it will not be powered on and you only have the CPU running. You can test this with blinky example for example.

RE: How to reduce power consumption when using only MCU with no communication

PhilippeG — Sat, 15 Jul 2023 01:38:54 GMT

dear Hung Bui,

Thanks for your answer

In fact in a first phase of a consumption sensitive product feasibility, i will only use the CPU of the nrf52840, and i need to study its power consumption when multithreaded programming. I would like to make sure nothing else than no BLE routine is ON in that mode, is there anything i need to declare off manually to make sure i study only the CPU?

thanks a lot

RE: How to reduce power consumption when using only MCU with no communication

Hung Bui — Tue, 11 Jul 2023 12:29:59 GMT

Hi Philippe,

I'm not really sure I understand what you meant by

[quote user="PhilippeG"]can we put on Idle all the BLE functions too[/quote]

When you do BLE, the radio will handle the communication. The CPU is only wake up when needed, for example to process BLE data.
In between BLE interval everything is put to sleep (except for the timer )

RE: How to reduce power consumption when using only MCU with no communication

PhilippeG — Tue, 11 Jul 2023 01:02:28 GMT

Hi, thanks for your help.

I will look at that, can we put on Idle all the BLE functions too ? even if the CPU is working quite intensively?

Philippe

RE: How to reduce power consumption when using only MCU with no communication

Hung Bui — Mon, 10 Jul 2023 14:11:00 GMT

Hi Philippe,

When a peripheral is not active it will be turned off automatically.

To put the CPU to low power consumption, you need to put it into IDLE mode (System ON IDLE).
My suggestion is to take a look at the RTC example (\examples\peripheral\rtc) and see how the CPU is put to sleep in the main while loop. And the CPU is only wake up on timer interrupt.