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LFXO active with 0.5μA higher current

Hi, On the 3.30 of nRF52832_Rev_1_Errata_v1.5.pdf, the sleep current with LFXO active is 0.5μA higher. I am using a nRF52832 module with the low frequency crystal oscillator installed and "nRF5_SDK_13.0.0_04a0bfd\examples\ble_peripheral\ble_app_beacon "coded .The sleep current is 2.5μA. I guess the higher current may result from the LFXO. How to deactive the LFXO? Isn't it activated in the BLE stack in the initialization state?

Waiting for your answer. Best wishes.