Why is UART Power Management Not Affecting Power Consumption on nRF9151DK?

RE: Why is UART Power Management Not Affecting Power Consumption on nRF9151DK?

Asbjørn — Thu, 21 Nov 2024 12:08:46 GMT

Hi,

glad you figured it out and yes, there might be additional steps sometimes to get there from some of the example code.

Best regards

Asbjørn

RE: Why is UART Power Management Not Affecting Power Consumption on nRF9151DK?

GUOQI123 — Thu, 21 Nov 2024 07:41:09 GMT

Thank you very much for your help. I have consulted the FAE who provides support for us and figured out where the additional power consumption comes from. It is actually because, for a simple program like Blinky, if the modem is not put into sleep mode in the code, the modem's state becomes unknown, which could be the source of the extra power consumption.

RE: Why is UART Power Management Not Affecting Power Consumption on nRF9151DK?

Asbjørn — Wed, 20 Nov 2024 12:20:35 GMT

Hi,

General recommendations:

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/test_and_optimize/optimizing/power_general.html

Documentation of CONFIG_PM

https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/services/pm/system.html

Are you disabling trace/debugging? Are you setting the idle command in between UART events? The CONFIG_PM isn't needed to enter power down mode as long as you disconnect the debug port and use idle commands.

How are you setting your code to enter power down mode?

Best regards

Asbjørn

RE: Why is UART Power Management Not Affecting Power Consumption on nRF9151DK?

GUOQI123 — Tue, 19 Nov 2024 09:43:46 GMT

Hello, I apologize for any confusion caused by my unclear description. I now suspect that my issue might be due to CONFIG_PM not being enabled. So, I would like to reframe my current question.

I am now preparing to enable the CONFIG_PM configuration option.

From the image above, it appears that CONFIG_PM has not taken effect. By checking its dependencies, I see that it requires (SYS_CLOCK_EXISTS && HAS_PM).

From the image below, I can confirm that SYS_CLOCK_EXISTS is already enabled, but I am unsure how to enable HAS_PM.

In short, I am unclear about how to enable CONFIG_PM. I hope you can help me with this.

RE: Why is UART Power Management Not Affecting Power Consumption on nRF9151DK?

Asbjørn — Mon, 18 Nov 2024 15:40:05 GMT

Hello,

I'm not able to understand what you are trying, but I'm reading that you are finding a current consumption that is too high for what you expect. From the plot it seem like there's an MCU still running as that will roughly consume about 3mA.

What sort of operation are you trying to use? UART with MCUs sleeping? Have you put the modem to sleep as well? What sort of current consumption are you expecting to see in the mode you are trying to get to?

Best regards

Asbjørn