Current Measurement on nRF5340 DK

RE: Current Measurement on nRF5340 DK

JONATHAN LL — Tue, 15 Mar 2022 15:29:36 GMT

Hi Frikkie,

[quote user="Frikkie Badenhorst"]We have managed to place the device in System Off mode, in which case the system draws 2uA.[/quote]

This is correct.

The CONFIG's should just be a if() check of the CMakeList.txt, Kconfig and source files so you can check what how it is done in the Kconfig documentation:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/CONFIG_LOG.html?highlight=config_log
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/CONFIG_PM.html?highlight=config_pm
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/kconfig/CONFIG_SERIAL.html?highlight=config_serial#std-kconfig-CONFIG_SERIAL

Regards,
Jonathan

RE: Current Measurement on nRF5340 DK

Frikkie Badenhorst — Tue, 15 Mar 2022 12:40:25 GMT

We are using our own custom, baremetal application (no Zephyr). In the application, we only have the RTC, Watchdog 0 and 1 UART enabled and running.

We have managed to place the device in System Off mode, in which case the system draws 2uA. I think this is expected, so I would believe our above method of measuring current is fine?

[quote userid="91187" url="~/f/nordic-q-a/85819/current-measurement-on-nrf5340-dk/358182#358182"]Have you seen this guide:Optimizing Power on nRF5340 SoC Designs - Blogs - Nordic Blog - Nordic DevZone (nordicsemi.com)[/quote]

Thanks for referring me to this article, however we have created our own separate project (without a proj.conf file) as we are not going to use Zephyr. We want to have full control over the device and understand exactly in which state it is and when. I thus have a question regarding

CONFIG_LOG=n
CONFIG_SERIAL=n

and

CONFIG_PM=y

What exactly is serial logging and is it enabled by default? How would one disable it using firmware rather than editing a config file? If you could refer me to where this is written in the manuals, that should also be fine. Also, what is the firmware equivalent of CONFIG_PM=y?

According to the Product Specification, the PMU is automatic, and you can only put the device in on of 3 states, 1) System On low power (which we are trying to achieve), System on constant latency and System off. How does CONFIG_PM=y fit in here?

Regards,

Frikkie

RE: Current Measurement on nRF5340 DK

JONATHAN LL — Tue, 15 Mar 2022 11:52:58 GMT

Hi,

Can you provide the PPK2 measurement files?

What SW are you running on the 53DK ? is it one of our samples?

Have you seen this guide:Optimizing Power on nRF5340 SoC Designs - Blogs - Nordic Blog - Nordic DevZone (nordicsemi.com)

Regards,
Jonathan