Sleep mode is the default mode of the HDC302x upon Power Up/Cycle, Hard Reset through the RESET pin, and Soft Reset. The HDC302x will wait for an I2C instruction to trigger a measurement, or to read and write valid data. A measurement request will trigger the HDC302x to switch to measurement mode, where measurements from the integrated sensors are passed through an internal ADC, and go through linearization using calibration data from within the device to produce accurate calculations of temperature and relative humidity. The results are stored in their respective data registers. After completing the conversion, the HDC302x returns to sleep mode.