ZigBee + FreeRTOS example power consumption optimization

[naps]

Hi, I'm using nrf52 dk and struggling to get low power consumption using multi_sensor_freertos ZigBee example from nrf sdk. Can you provide me some guides on how to optimize it? The lowest I can get is 600uA, which in my case is unacceptable. I was trying to add ZigBee dependencies to compile with blinky rtc example, but still after radio start-up i've got more than 0.5mA.

[Susheel Nuguru]

I have not measured it myself, but how much does the multi_sensor Zigbee example consume without FreeRTOS? How much is acceptable in your application?

[naps]

Hi,
Thank you for your fast response!
From what I discovered with the power profiler, multi_sensor_freertos in original configuration consumes 1mA, blinky_rtc_freertos has average around 4uA, and light bulb/switch example also consumes much less than 1mA. Can you point me the way of optimizing multi_sensor_freertos  example?

[Susheel Nuguru]

multisensor Zigbee and blink_rtc_freertos are not the same applications.

The best would be to compare power consumption between multisensor (non freertos example) and multisensor_freertos example with a power profiler. If you see a huge difference in these two scenarios, then we can take a look at it. Can you please compare and see. 

[naps]

I've just checked using a power profiler, and the multi_sensor application consumes only around 20 uA while running..

[Susheel Nuguru]

Then it looks like it is specific to freeRTOS issue. I would have to look at implementation of this example. I am good knowledge on FreeRTOS but not so much on Zigbee, I need to figure out if there are any inconsistencies in how the tasks are made.

If you have enabled the logs, I have noticed on other SDK that they create some issues with power consumption. Try to disable the logs and see if that helps, if it does, then I would have more focused area to debug the issue.