Intelligent self-calibration chip based on chip internal clock crystal oscillator and self-calibration method

The invention discloses an intelligent self-calibration chip based on a chip internal clock crystal oscillator and further discloses an intelligent self-calibration method based on the chip, wherein the method comprises the following steps of: storing a mediant value of the initially determined application array digit into a storage unit as the reference data; inputting the reference data into the storage unit as temporary numerical value; judging whether the temporary data to be the initial data, the data needing to be calibrated or the calibrated data; conducting plus-minus operation to the temporary data output to obtain the adjustment data; adjusting a corresponding resistance array, a capacitor array and the adjusted clock frequency according to the adjustment data; comparing the adjusted clock frequency and the reference source clock frequency; conducting timing and metering operation and circulating the operation until an optimum value is found; and storing the final data calibrated by the clock frequency in the storage unit. The self-calibration method can control the clock frequency error value of the chip internal clock crystal oscillator in a more accurate scope.