Anomalies in nRF52840 current measurement using power profiler

[Ritika Agarwal]

I see some interesting phenomena on the power profiler (with nRF52840) that would need some help to explain. I am using the ble_app_uart code from ble_peripheral folder in examples.

In the figure below, it seems while advertising on channel 39, the Nordic chip received some telemetry data as a result of which the receive period is elongated and there is another transmission packet after that, is this correct? I am not trying to connect to the chip, so I am guessing its some noise from environment causing it to have false receive.

Another interesting thing I saw is below. There are some spikes happening after the chip finishes advertising on all 3 channels, I am not able to explain this – could you please help here?

Thanks for your support and time!

Regards, Ritika Agarwal

[bjorn-spockeli]

Hi Ritika,

The ble_app_uart example sets both the advertisment data and the scan response data in advertising_init(), so the behavior you're seeing in the first picture is the nRF52840 sending advertisment packets on all 3 adv. channels followed by a scan response to the central.

The spikes you see in the second picture is most likely a couple of interrupts being handled by the CPU.

Best regards

Bjørn