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measurement error the temperature sensor

Other Parts Discussed in Thread: CC2540, CC2541

I have a problem with the temperature sensor, when I locate it in a refrigerator and the temperature drops to 0 degrees, the sensor sends the temperature measurement with intervals of +500 degrees Celsius.
The device will vacuum packaging to prevent moisture but is an error with the measurement of temperature

This sample of lectures

+509.34
+509.16
+509.00
+508.81
+508.81
+509.72
I'm developing a project for cold chain traceability and sensor faults is presented to me, because I need the sensor always this inside a refrigerator in a truck going to monitor the temperature