Follow the answer from TI support to my question posted previously in this group.

   Ricardo,

   The maximum drift over life time is within the calculation +/-
   49.3mV which is a range of about 100mV. To get acceptable results
   you should calibrate the temperature sensor from time to time. But
   we do not have exact data for this parameter. The same applies to
   the internal voltage reference.

   If you would like a high accuracy temperature sensor then, I would
   suggest using an external sensor, like PT100.

   Regards,

   Tresha Jackson

   Analog and Mixed Signal Product Specialist
   Texas Instruments
   Semiconductor Technical Support
   http://www-k.ext.ti.com/sc/technical_support/pic/americas.htm

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