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¡¡¡¡A major benefit of digital power solutions is the ability to read the actual load current in real time over the power management bus £¨PMBus£©¡£ The load current measurement is possible with knowledge of the current-sense element¡¯s impedance. The current measurement¡¯s accuracy is a function of many parameters such as board parasitics£¬ the measurement component¡¯s tolerance£¬ and the IC¡¯s internal gains and offsets. If the variations in these parameters are not accounted for£¬ the measured load current will not be as accurate as one might expect. Fortunately£¬ the PMBus specification provides two calibration coefficients£¬ IOUT_CAL_GAIN and IOUT_CAL_OFFSET £¨collectively referred to as IOUT_CAL values£©£¬ which allow the user to calibrate out the parameters that affect the current measurement¡¯s accuracy. Every InTune IC is shipped with default values for these coefficients. These values must be calibrated to provide accurate output current measurements.