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How to reach nRF52840 UARTE current supply specification ?

Hi, I work on the nRF52840-Preview-DK board. I try to make a ble to uart bridge and I start with the nRF5 SDK 14.0.0 ble_app_uart example.

I compare the current supply of the example and the same code without the uart initialization. The current supply is 0.8mA greater with the uart initialization. In the "nRF52840 Objective Product Specification v0.5" the electrical specification indicate 55uA.

If I call the function "app_uart_close()" after "uart_init()" the current supply is always 0.8mA greater than the code without uart initialization.

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