RE: Power consumption BLE nRF5340

Kazi Afroza Sultana — Fri, 02 May 2025 06:40:54 GMT

Hello,

The spikes you see while connecting to central, I think it is related to the calibration of LFCLK. When using the LFRC oscillator, the nRF5340 needs to perform periodic calibration against the HFXO to maintain the 500-ppm accuracy required for BLE. After certain interval when calibration occurs PPK shows the spike of current in mA level.

You can try to set this CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=n if your application is not so performance constraint.

Do you have DC-DC converter on your custom board? Ensure that the following configurations are set

CONFIG_BOARD_ENABLE_DCDC_APP=y
CONFIG_BOARD_ENABLE_DCDC_NET=y

Besides this, you need to check if any unnecessary peripherals are on in the application, you can disable those from device tree.

Thanks

BR
Kazi