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Thread: Teensy 4.0 Compatibility with 1.71V to 1.95V

  1. #1
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    Teensy 4.0 Compatibility with 1.71V to 1.95V

    Hello everybody,
    I wonder if someone has already tested the I2C communication to a device that communicate with an I2C bus with voltages in the range 1.71V to 1.95V.
    Should I add a circuit to adapt tension to 3.3V for the Teensy input?

  2. #2
    Senior Member+ Frank B's Avatar
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    I'd check the device if it is 3.3V tolerant.
    If yes, just try it without circuit.

  3. #3
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    I'm trying to interface teensy with ICM-20948 (I still don't have this chip), previously I was using the MPU9250 that is going out of stock. The chips are pin-to-pin compatible, except that VDDIO is changed from the range [1.7V - 3.5V] to [1.71V - 1.95V]. I've not found anywhere if teensy can dialogue to ICM without adapting the voltage. Anyone knows it?

  4. #4
    Senior Member+ Frank B's Avatar
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    You may want to download the datasheet and have a look

  5. #5
    Senior Member+ Frank B's Avatar
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    Hm. Or, try to connect the needed pull-up resistors with vddio, not 3.3v.
    But I'm not sure if that works.

  6. #6
    Senior Member+ manitou's Avatar
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    datasheet says max is Vddio of 1.8v. sparkfun has a breakout and they use pullups to 1.8v
    https://www.sparkfun.com/products/15335

  7. #7
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    Ok, thanks, I will do the same. I was just wandering if I can use the same PCB I've already made for MPU9250.

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