How to reach system off current of 0.8uA with nRF54L15

RE: How to reach system off current of 0.8uA with nRF54L15

samuel4 — Mon, 09 Dec 2024 15:42:17 GMT

Thank you! It's working now. In order to wake up periodically, I had to keep RET2 enabled. Deep sleep current meets 800nA as specified in the datasheet.

Kind regards
Samuel

RE: How to reach system off current of 0.8uA with nRF54L15

runsiv — Mon, 02 Dec 2024 14:54:59 GMT

I think the issue is RAM rentention. It need to be turned off the reach the numbers in the datasheet. I will test it myself tomorrow and get back to you.

It can be turned off by adding the following to main

NRF_MEMCONF->POWER[0].RET = 0;

NRF_MEMCONF->POWER[1].RET = 0;

NRF_MEMCONF->POWER[0].RET2 = 0;

NRF_MEMCONF->POWER[1].RET2 = 0;

Update: This should fix the issue

Regards

Runar

RE: How to reach system off current of 0.8uA with nRF54L15

runsiv — Fri, 29 Nov 2024 09:01:28 GMT

True, i mixed up on my end. I'm thinking it could be that the device goes into emulated system off due to the usb cable I presume you are using. I will try to replicate it on my end. It could also be due to

Regards

Runar

RE: How to reach system off current of 0.8uA with nRF54L15

samuel4 — Thu, 28 Nov 2024 13:35:22 GMT

The Chip has "QFAABB" printed on the middle line - so it seems it is engineering B. However, the system off example switches into system off? I mean the issue is about system on mode.

Kind regards

Samuel

RE: How to reach system off current of 0.8uA with nRF54L15

runsiv — Thu, 28 Nov 2024 12:25:31 GMT

Hi Samuel

Which version of the DK do you have and what sample have you tested?

If your DK is engineering B it might be this errata

Regards

Runar