Not able to achieve minimum sleep current on NRF54L15

RE: Not able to achieve minimum sleep current on NRF54L15

payalD — Thu, 27 Mar 2025 08:49:39 GMT

Ok. Thank you.

RE: Not able to achieve minimum sleep current on NRF54L15

Vidar Berg — Thu, 27 Mar 2025 06:13:58 GMT

Hello,

Typical sleep current for some selected configurations are documented in the Current consumption section of the datasheet.

RE: Not able to achieve minimum sleep current on NRF54L15

payalD — Thu, 27 Mar 2025 06:11:15 GMT

Hello Vidar,

[quote userid="4240" url="~/f/nordic-q-a/120131/not-able-to-achieve-minimum-sleep-current-on-nrf54l15/528957"]The measurements appear to be a bit on the high side[/quote]

What is the expected sleep current in all RAM-enabled mode?

[quote userid="4240" url="~/f/nordic-q-a/120131/not-able-to-achieve-minimum-sleep-current-on-nrf54l15/528957"]You should also use the Pin sense mechanism for low power.[/quote]

The Pin sense mechanism allowed me to reduce the sleep current to 4 micro Amps while detecting interrupt in sleep mode.

RE: Not able to achieve minimum sleep current on NRF54L15

Vidar Berg — Wed, 26 Mar 2025 05:44:16 GMT

Hello,

The measurements appear to be a bit on the high side. Could be chip to chip variation (within normal distribution) or leakage on the board. You can try to disconnect the connections mentioned below via the board configurator in nRF connect for desktop to see if it helps.

https://docs.nordicsemi.com/bundle/ug_nrf54l15_dk/page/UG/nRF54L15_DK/measurements/set_up_dk.html

[quote user="payalD"]When I tried to configure the GPIO as interrupt sleep current increased to 22 micro Amps. Is there any way to reduce the sleep current in this scenario?[/quote]

Which Port did you use? You should also use the Pin sense mechanism for low power.

https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/gpio.html

&gpio0 {
	/* Use PORT event rather than GPIOTE IN event, to save power */
	sense-edge-mask = <0xffffffff>;
};

RE: Not able to achieve minimum sleep current on NRF54L15

payalD — Tue, 25 Mar 2025 13:04:44 GMT

Hello Vidar,

Thanks for your quick reply.

I tried the sample code provided by you, and the following are the sleep current results:

1. All RAM Enabled: 4 micro Amps

2. 128k RAM Enabled: 3.1 micro Amps

3. 64k RAM Enabled: 2.7 micro Amps

Are these the expected results?

If yes, I have a follow-up query. When I want to keep all RAM Enabled, and want to configure 1 GPIO as interrupt mode, while the device is in system-on sleep mode, for wake-up. When I tried to configure the GPIO as interrupt sleep current increased to 22 micro Amps. Is there any way to reduce the sleep current in this scenario?

RE: Not able to achieve minimum sleep current on NRF54L15

Vidar Berg — Tue, 25 Mar 2025 11:05:25 GMT

Hello Payal,

Have you disabled serial logging over UART (CONFIG_SERIAL=y)? If not, then that may increase the high idle current since the UART will request the HF clock to be kept active in sleep. You may also try this sample:

devzone.nordicsemi.com/.../current_5F00_meas_5F00_test.zip

Best regards,

Vidar