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bq78pl114s12 integrated board temperature sensor shows strong error at low temperature

Testing the temperature reading of the bq78pl114s12 shows strong offset at low temperatures.

Other sensor readings are ok.

The offset i can find on every battery. The sensor is within the controller. Circuit is as TI recommended.

Datasheet specifies accuracy for internal temp-sensor down to -30°C, but there is a huge difference.

Someone who knows this problem? Some help here?

 

Best regards

Andreas