teency 3.2 AREF pin

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Page 37 of the Teensy 3.2 data sheet says that the minimum reference voltage is 1.13V. So, in order to read your thermocouple, you'd have to use a x 6 i-amp circuit to map the 0-0.2V signal to the 0-1.2V range which is available through the internal 1.2V bandgap reference.
 
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