Hello Suresha,
Many systems specify accuracy/error in terms of %FSR which means the accuracy in percent of the full-scale range. We are going to update some things about TIPD120 and one of them is to specify the accuracy in degrees Celcius to make it more consistent with other temperature sensing applications specifications.
Your calculations are correct and after a gain + offset calibration the measured accuracy was <0.005C at room temperature. The design was tested on several boards which produced very similar results after calibration.
Designs with hardware compensation resistors (RCOMP) do not typically do well over temperature without frequent calibration because the drift of the additional RCOMP resistor directly affects the measurement accuracy.
If the design is meant to operate over a wide operating temperature then it is advised to remove the "RCOMP" resistor and operate the system without hardware compensation to avoid the drift issues mentioned previously. Data without a hardware compensation resistor will be the main update to TIPD120 and it will be online by the end of the year.
Thanks for reading!