BLE - High current peak (40mA)

[Henrico]

Dear Nordic Support,

I'm working on a custom board, containing the NRF52840. I am using SDK 15.3.0 and SoftDevice s140 to implement BLE.

Recently I've bought the Power Profiler Kit (PCA63511) in order to measure the current consumption and calculate the battery life. However I'm measuring really high current peaks on the advertising interval, see attached image below. The TX power level is set to +8dBm at all times. When disconnected the peak is almost 40mA and when connected around 20mA. This is a lot higher than is stated in the documentation (less then 10mA total). How is this possible and are there known issues that can cause this high current peaks? Or does the TX power level make such a large difference?

Best regards,

Henrico Brom

[Turbo J]

Is DC/DC switching regulator off? Tx current at 8dBm is specified a 32.7mA typical, and that is just for the RADIO peripherial. (see PS 1.1 table 60.20.15.2).

For comparison: 4dBm is at 21.4mA, 0dBm is at 10.6mA current.

The 40ish mA is likely the sum of RADIO plus MCU core plus clock tree.

[Snail Feng]

Hello, is it normal to reach 40MA? No other peripherals started