... how they calibrate/characterize the temperature sensors. IIRC your temperature sensors are intentionally low-resolution: something like 10C,20C,30C,... What is the achieved accuracy of step-crossing temperature for your existing chips that were already manufactured?
Our Temperature Sensor's spec is +/- 5%. The +/- 5% represent limits with 3-sigma probability. Practically its accuracy is much better. Temperature Sensor of every produced chip is tested as a part of chip's production test. Automatic calibration is a part of the sensor so no any additional calibration is required. The Thermal sensor IP was bought from GUC and it's silicon proven.