How to reduce the power consumption of nrf54l15

RE: How to reduce the power consumption of nrf54l15

Håkon Alseth — Tue, 25 Mar 2025 11:11:59 GMT

Hi,

[quote user="Ethan330"]Your test results differ from the calculated values by nearly 21ua, indicating that power consumption can be reduced by optimizing software configuration[/quote]

The nRF54L15 DK runs at 1.8V (measured 1.81V to be exact). You need to adjust for this in the calculator.

The point of my measurement is to show that the sleep current in my test is indeed lower than your measured sleep current, and it is even lower than the expected level in the online power profiler (3.3 uA). This is due to chip-to-chip variances, as well as environment (temperature etc).

Kind regards,

Håkon

RE: How to reduce the power consumption of nrf54l15

Ethan330 — Tue, 25 Mar 2025 01:00:10 GMT

Thank you for your reply

[quote userid="2115" url="~/f/nordic-q-a/119907/how-to-reduce-the-power-consumption-of-nrf54l15/528581"]

I flashed the unmodified sample, as this:

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west build -b nrf54l15dk/nrf54l15/cpuapp -- -DFILE_SUFFIX=release
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

west build -b nrf54l15dk/nrf54l15/cpuapp -- -DFILE_SUFFIX=release

And here is the sleep current, ie. the current in between the radio pulses:

[/quote]

Your test results differ from the calculated values by nearly 21ua, indicating that power consumption can be reduced by optimizing software configuration。

So I would like to ask which software configurations can be modified to reduce power consumption？

For example, will the following configuration have an effect?

CONFIG_RAM_POWER_DOWN_LIBRARY=y

CONFIG_APP_USE_RETAINED_MEM=y

&gpio1{

status="ok";

sense-edge-mask=<0xffffffff>;

};

Or disable some unnecessary kernel functions？

RE: How to reduce the power consumption of nrf54l15

Håkon Alseth — Mon, 24 Mar 2025 11:21:55 GMT

Hello,

I flashed the unmodified sample, as this:

west build -b nrf54l15dk/nrf54l15/cpuapp -- -DFILE_SUFFIX=release

And here is the sleep current, ie. the current in between the radio pulses:

You shall expect to see 2 - 3.5 uA in between the peaks.

Could you please also measure the same? It does seem that yours is higher, which can explain why you are seeing a difference between the calculation and real-life measurement.

Please also be aware that the online power profiler is meant as an approximation, and is modeled after real measurements. This means that you will see a difference between the calculated and the measured current consumption.

I also tried your .config, and saw the same current consumption levels.

Kind regards,

Håkon

RE: How to reduce the power consumption of nrf54l15

Ethan330 — Mon, 24 Mar 2025 09:40:10 GMT

I am currently using my custom board to test the power consumption, which is 12.4ua(1.2s adv,internal 32k rc,0dbm,payload 26bytes). This custom board has removed other chips, leaving only NRF54L15.

As shown in the following figure：

Difference from calculation result by 2.4ua。

The configuration file generated by code compilation is as follows：

devzone.nordicsemi.com/.../8546.zephyr.dts devzone.nordicsemi.com/.../3678.config.txt

How else can I optimize software to reduce power consumption？

RE: How to reduce the power consumption of nrf54l15

Håkon Alseth — Fri, 21 Mar 2025 10:56:55 GMT

Hi,

Thank you for sharing.

Your configuration indicates that you are using internal 32kHz RC oscillator, which will add approx. 1 uA due to calibration.

There is an static offset of approx. 3-4 uA in your measurements - Could you try to check with an ampere-meter to see if the measurements are still offset with this smaller current?

Kind regards,

Håkon

RE: How to reduce the power consumption of nrf54l15

Ethan330 — Fri, 21 Mar 2025 00:54:39 GMT

devzone.nordicsemi.com/.../export.xlsxThis is the power consumption data exported by my power monitor device（1.2s adv, External crystal , 0dbm, payload 20bytes）。

[quote userid="2115" url="~/f/nordic-q-a/119907/how-to-reduce-the-power-consumption-of-nrf54l15/528270"]Which version of the nRF54L15-DK are you using when testing?[/quote]

This is my NRF54L15 development board：

RE: How to reduce the power consumption of nrf54l15

Håkon Alseth — Thu, 20 Mar 2025 15:41:37 GMT

Hi,

Can you share a close up of the dynamic current consumption? I want to see the sleep levels that you are seeing.

Given that the calculator states approx. 1.4 uA away from the target current, I suspect that your firmware is more-or-less optimized. Have you done any specific changes to the application itself?

Which version of the nRF54L15-DK are you using when testing?

Kind regards,

Håkon

RE: How to reduce the power consumption of nrf54l15

James168 — Thu, 20 Mar 2025 04:00:52 GMT

I think it's the useful document, for your reference.

www.cnblogs.com/.../9351048.html

RE: How to reduce the power consumption of nrf54l15

Ethan330 — Thu, 20 Mar 2025 01:02:53 GMT

[quote userid="2115" url="~/f/nordic-q-a/119907/how-to-reduce-the-power-consumption-of-nrf54l15/527831"]Are you using the nRF54L15-DK for testing? If yes, then the default voltage is 1.8V.[/quote]

Yes, I tested it using the nRF54L15-DKboard; But I am using a power monitor that supplies 3V power to the board.

I used the "Online Power Profiler for Bluetooth LE" for power consumption prediction, with a broadcast interval of 1.2s and a power consumption pre calculation of 8.7ua. However, the actual power consumption I tested with the DK board was 10.14ua. the size of the advertising payload is 20 bytes。The test results are shown in the picture below：

So I still want to ask if there are any ways to reduce power consumption？

and How to close the GPIOTE?

RE: How to reduce the power consumption of nrf54l15

Håkon Alseth — Tue, 18 Mar 2025 12:30:48 GMT

Hi,

Are you using the nRF54L15-DK for testing? If yes, then the default voltage is 1.8V.

If you plot in 2 seconds adv. interval with 20 bytes of payload, and VDD=1.8V here:

Online Power Profiler for Bluetooth LE

Depending on the size of the advertising payload, you should expect to see from 7 to 9.5 uA.

Kind regards,

Håkon