RE: Usage of temperature sensor of nRF52 above 85°C

Remo — Fri, 24 Feb 2017 16:03:49 GMT

Thank you.

RE: Usage of temperature sensor of nRF52 above 85°C

ovrebekk — Fri, 24 Feb 2017 09:32:40 GMT

Hi Remo

The simple, if embarrassing, answer is that we don't really know how the temperature sensor will behave outside the specified absolute ratings ;) We test the chip to make sure it meets the specification within the defined operating ranges, and once you go outside then it is hard to predict.

The likely result like you say is that it will be much less accurate, and I expect that the current consumption will be much higher.

To be safe you should probably set the cutoff limit at 80°C measured, to make sure that the actual temperature is not above 85°C. Alternatively you would have to run some calibration of the temperature sensor, but this is probably not practically doable if you are going into mass production, as every device would have to be individually calibrated.

Best regards
Torbjørn