RE: nRF54L05 wake on I2C standby current

Jonsiann — Mon, 12 Oct 2026 17:32:40 GMT

This answers my question - thanks for the quick turn around!

RE: nRF54L05 wake on I2C standby current

Vidar Berg — Mon, 12 Oct 2026 13:51:57 GMT

Hello,

It won’t keep the HF clock running, but it will still increase the floor current. I measure 18 uA in sleep (System ON) at 3 V with TWIS enabled on my desk with the nRF54l15DK emulating the nrf54l05 and the test sample attached below (built with NCS v3.4.1).

devzone.nordicsemi.com/.../5556.twis_5F00_idle.zip

Best regards,

Vidar

PPK2 plot:

EDIT: The nRF15L05 has the TWIS30 instance in the low power domain. Switching to that instance gave significantly lower power consumption in System ON idle:

To test this you can swap out the content of the board devictree overlay with this:

/*
 * TWIS30 (LP domain) must use port P0. SCL must be on a clock pin: P0.04 (DK Button 3).
 * SDA: P0.02 (DK VCOM0 RTS, disconnect VCOM0 in Board Configurator).
 */

&pinctrl {
	twis30_default: twis30_default {
		group1 {
			psels = <NRF_PSEL(TWIS_SDA, 0, 2)>,
				<NRF_PSEL(TWIS_SCL, 0, 4)>;
			bias-pull-up;
		};
	};

	twis30_sleep: twis30_sleep {
		group1 {
			psels = <NRF_PSEL(TWIS_SDA, 0, 2)>,
				<NRF_PSEL(TWIS_SCL, 0, 4)>;
			low-power-enable;
		};
	};
};

&i2c30 {
	compatible = "nordic,nrf-twis";
	pinctrl-0 = <&twis30_default>;
	pinctrl-1 = <&twis30_sleep>;
	pinctrl-names = "default", "sleep";
	status = "okay";
};

And if you are using the nordic DK, disconnect the UART lines from the interface MCU so they can be assigned to the TWIS instead.