Hi,
I am reading the internal temperature sensor of this chip and using the left-justify to read the 8 bit ADCH register and the output doesn't seem right.
The reading consistently sits at around 360mV. When I apply cooling to the chip it drops to around 355mV, and when I apply heat it goes up to around 370mV, so it appears to be working, but according to the datasheet for this chip, 314mV equals around 25C, therefore my temperature reading is something like 65C.
I am using the internal 1.1 voltage reference with an external capacitor on the AREF pin. I haven't done any other noise cancellation or calibration and the room temperature is less than 20C. Why is the temperature so high?
Thanks,
Geof.
I am reading the internal temperature sensor of this chip and using the left-justify to read the 8 bit ADCH register and the output doesn't seem right.
The reading consistently sits at around 360mV. When I apply cooling to the chip it drops to around 355mV, and when I apply heat it goes up to around 370mV, so it appears to be working, but according to the datasheet for this chip, 314mV equals around 25C, therefore my temperature reading is something like 65C.
I am using the internal 1.1 voltage reference with an external capacitor on the AREF pin. I haven't done any other noise cancellation or calibration and the room temperature is less than 20C. Why is the temperature so high?
Thanks,
Geof.