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Thread: Teensy 4.0 DAC Pins? 34 35 38 39?!

  1. #1

    Teensy 4.0 DAC Pins? 34 35 38 39?!

    Hello,

    I'm confused, the Teensy 3.2 and 3.5 3.6 had DACs (1/2/2).
    On the back of the Teensy there are 4 DATx Pins. Are these DAC Pins?

    If not... has the Teensy 4.0 no DACs?

    Another question: why the pins are not 5V tolerant? This was a very good feature, now I have to use 3 x 8 Pins Voltage converters, thats very complicated and need many many more space and chips.

  2. #2
    Senior Member+ MichaelMeissner's Avatar
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    Quote Originally Posted by Utak View Post
    Hello,

    I'm confused, the Teensy 3.2 and 3.5 3.6 had DACs (1/2/2).
    On the back of the Teensy there are 4 DATx Pins. Are these DAC Pins?
    No, these are pins for driving a micro SD card reader in quad SPI mode.

    Quote Originally Posted by Utak View Post
    If not... has the Teensy 4.0 no DACs?
    That is right, the Teensy 4.0 has no DACs. For audio, you could use the two MQS pins (pins 10 and 12), but you lose the main SPI port if you use this.

    Quote Originally Posted by Utak View Post
    Another question: why the pins are not 5V tolerant? This was a very good feature, now I have to use 3 x 8 Pins Voltage converters, thats very complicated and need many many more space and chips.
    Because the underlying 1062 chip from NXP does not provide 5v tolerance, DACs, or touch reading capability. Paul can't provide that support if the underlying system doesn't provide it.

  3. #3
    Thanks for the fast reply.

    How I can use the two MQS pins (pins 10 and 12) as DACs?

    But I think I will use a Teensy 3.5 and saw off the board all behind the pin 18 (the whole SDCard)
    Then I have 5V tolerate pins and its nearly short like a Teensy 3.2 and 4.0

  4. #4
    Senior Member+ defragster's Avatar
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    Quote Originally Posted by Utak View Post
    Thanks for the fast reply.

    How I can use the two MQS pins (pins 10 and 12) as DACs?
    ...
    Quick forum search on MQS - one was this :: Teensy-4-MQS-pins-what-are-they-where-can-I-read-about-them-are-they-supported

  5. #5
    Thanks, I will try it out.

  6. #6
    Edited, ups... false board :-)

  7. #7
    Ok, I've tested it with MQS, and is working fine ;-)

    Thank you!

  8. #8
    uTAK, how was the resolution and latency, did you use it for an audio application. Thank you

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