Currently, we are developing power-saving firmware using nRF 52 Development Kit (for nRF 52832).
I wrote Nordic's SDK and executed it, it was a measured current of about 600 uA.
nRF5_SDK_15.2.0_9412b96 \ examples \ peripheral \ pwr_mgmt \ hex \ nrf_pwr_mgmt_pca 10040.hex
Meanwhile, in the sample code of the PlatformIO + mbed environment, the measured current was only about 20 uA at the start of BLE + LED.
github.com/.../mbed-ble-thermometer
Please tell me how to suppress the current to about 20uA with the Nordic official SDK.