The slew rate warning feature utilizes the known conversion period for the calculation of the slew rate based on the device setting. If there is an error of the conversion period (t_{CONV_PERIOD}) due to a non-ideal oscillator, the actual conversion period may be slightly longer or shorter, resulting in error of the slew rate calculation. Equation 1 shows the equation for calculating the slew rate with t_{CONV_PERIOD} as the time period over which the calculation takes place. If t_{CONV_PERIOD} is 90% of the expected value, the slew rate calculation will be 11% faster than the real value, calculated with Equation 2. This can be accounted for in a similar manner to temperature accuracy with proper guardbanding, as shown in the Section 4.