power consumption abnormal after using sd_temp_get

Abnormal power consumption is observed after using sd_temp_get to retrieve the MCU temperature on the nrf52840.

**SDK Ver: SDK17

**Source Code:

temperature.c

float get_mcu_temperature(void)
{
    float temperature = 0.0f;
    int32_t temp;
    sd_temp_get(&temp);
    temperature = (float)temp/4.0f;
    return temperature;
    //return (temp*((float)0.25));
}

main.c

    mcu_adc_temperature = get_mcu_temperature();
    sd_clock_hfclk_release();  /*TODO,测试是否增加时钟释放,可以降低功耗*/

**power data:

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