Guidance Needed for Measuring nRF52805 Current Consumption (Sleep, TX, RX Modes)

[PKG]

Hello,

I need to measure current consumption on the nRF52805 in sleep, TX, and RX modes. Which sample applications are recommended for each of these measurements? Additionally, please advise if there are any specific considerations or precautions I should keep in mind to ensure accurate current measurements.

Thanks,

PKG

[PKG]

Hi Samruddhi,

Thanks for sharing the link. I’ve made some progress on my side. I’m measuring the sleep current with the system in System OFF mode [sample: System Off ] , and I’m seeing about 0.173 µA. However, the link shows that the expected sleep current for System OFF, no RAM retention, wake on reset is around 0.3 µA.

I’m not sure whether my code is currently using RAM retention or not. How can I configure the system to ensure RAM retention is disabled?

Also, I’m not certain whether the sample I’m using is configured for DCDC or LDO mode. How can I change this configuration in the code?

Sample :

.. zephyr:code-sample:: nrf_system_off
:name: System Off
:relevant-api: sys_poweroff subsys_pm_device

Use deep sleep on Nordic platforms.

My measurement.

Thanks,

PKG

[PKG]

Hi Samrudhi,

For the sleep current, I was using the same sample that you shared.  https://github.com/nrfconnect/sdk-zephyr/tree/ncs-v3.2.3/samples/boards/nordic/system_off

The attached waveform was recorded during sleep mode. I’d like to understand what the larger spikes represent, as well as the smaller spikes that appear between them.

Also, do I need to modify any code for no RAM retention?

How to change the configuration from LDO to DCDC mode?

Thanks,

PKG

[Samruddhi Jadhav]

Hi Praveen,

I am looking into this and need some more time. Please note that there may be some delay in response time due to Easter. I will get back to you with an update by early next week. 

Best Regards,

Samruddhi