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uart's power consumption

use the SDK5 14.2.0, NRF52832, pca10040, the ble_peripheral\ble_app_uart\pca10040.
first, UART_EASY_DMA_SUPPORT = 1, run the uart_init(); the current is 1.2mA;
UART_EASY_DMA_SUPPORT = 0, run the uart_init(); the current is 0.29mA;
UART_EASY_DMA_SUPPORT = 0, no run the uart_init(); the current is 14uA;
UART_EASY_DMA_SUPPORT = 0, run the uart_init(); and then run app_uart_close(); the current is 0.29mA;

at this point,why not is 14uA?

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