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Thread: Audio Adaptor Board low power or shutdown, how?

  1. #1

    Audio Adaptor Board low power or shutdown, how?

    Hi

    I'm considering an audio application powered by 3xAAA. It's used only for a duration of about 10-20 minutes and then back a few days later.

    From past experience with similar simple equipment I know that from time to time somebody (often me) forgets to turn it off.
    --> empty AAA's.

    I think of 3 possible solutions to avoid it (I don't mind if the user has to restart after 20min) :

    a) add a piÍzo buzzer as a reminder with short pulses after 20 minutes
    b) put the teensy with the audio board in a low power state after 20 minutes and that could be enough if the power draw is low enough.
    c) cut the power to the teensy by the program.

    Questions :

    b) How low power is possible with the audio board?
    c) are there simple ways?

  2. #2
    Has nobody needed/tried this?

    I found mA nr's while in use, but I'm interested if it's possible to sleep, hibernate or even turn off the Audio board.

    https://forum.pjrc.com/threads/35056...595&viewfull=1

  3. #3
    Hi

    I found that the SGTL5000 can turn parts off. Is it save to turn the not used parts off while using the audio library?
    Any power use nr's if everything is "powered off" ?

    See control_sgtl5000.cpp : CHIP_ANA_POWER

    and

    write(CHIP_ANA_POWER, 0x4060); // VDDD is externally driven with 1.8V
    ...
    write(CHIP_ANA_POWER, 0x40FF); // power up: lineout, hp, adc, dac
    write(CHIP_DIG_POWER, 0x0073); // power up all digital stuff

  4. #4
    Has nobody some info about this?

    BTW. I don't mind the needed c++ changes.

  5. #5
    Senior Member
    Join Date
    Jul 2014
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    2,220
    Quote Originally Posted by AlainD View Post
    Has nobody some info about this?

    BTW. I don't mind the needed c++ changes.
    set CHIP_ANA_POWER simply to 0 to switch off SGTL5000, it does not harm (AFAIK)

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