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Thread: Analog max voltage?

  1. #1
    Junior Member
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    Jun 2016
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    Analog max voltage?

    Hi all, I am trying to read a 0 to 5V analog signal and I'm a little confused about the max voltage of the analog pins. I read that the Teensy is 5V tolerant on the digital pins and pins 14 to 23 and 26 to 31 have digital and Analog capabilities (A0 to A9 and A15 to A20). I also understand that the pure analog only pins A10 to A14 are 3.3V only. Does this mean I would need to put 5V on the AREF pin to read the full 5V range on A0-A9 and A15 to A20? Or should I stick to 3.3V on all pins to be safe?

  2. #2
    Senior Member+ defragster's Avatar
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    Feb 2015
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    15,484
    Any voltage over 3.3V will read max scale on those pins on those Teensy's that are 5V tolerant. Look for details on Voltage divider.

    Not noted which Teensy - read the card carefully. LC and 3.6 will be harmed, Others may have tolerance on digital capable pins

  3. #3
    Junior Member
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    Jun 2016
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    Thanks! I forgot to mention that I have the 3.2. I'll add a voltage divider to rescale it.

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