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Thread: Question: How do ADC measurements act when Vmeas exceeds Vref?

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    Question: How do ADC measurements act when Vmeas exceeds Vref?

    If your using the ADC on a teensy 3.6 to measure a voltage, with Vref set to either the 3.3v or 1.2v onboard supplies and the measured voltage exceeds the selected Vref voltage, but not by enough to damage the hardware, does the Teensy measurement:
    1. Cap out at the specified resolution. Max at 65536 for a 16bit configuration, for example?
    2. Roll around and start from zero?
    3. Give completely random results?

    I am hunting down an issue with my Teensy giving unrealistically scaled results that SEEM correct, right measured waveform, but scaled way too high (Teensy reads 100k+ for 16bit resolution) and cannot remember how the uC is suppose to act when the ADC goes over voltage. I am not in a position to try it on a teensy at the moment, so I am hoping someone can set me straight.

    Thanks
    Last edited by RRdae; 05-17-2020 at 04:13 AM. Reason: grammar

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