We need to sense temperatures in the upper end of the operating range, specifically in the 40C to 70C realm. We have three different units, and we are finding that the temp sensor specs appear to be violated. Using a calibrated thermocouple monitor, with a thermocouple place right on the chip, one unit reports spot on, a second unit reports a bit over 5C error, and a third unit shows over 10C error. The ±5C spec is pretty sloppy to begin with, but 10C is unacceptable. The piecewise linear calibration registers are poorly documented. We are attempting to deploy a beta test of 50 units in the field. Are we expected to have to do an individual calibration on each unit at 50C in order to get ±5C or better accuracy?
