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Original question:

TAS6584-Q1: DC Detect dis

TAS6584-Q1: TAS6584-Q1 Realtime diagnosis

Madhaiyan Kodi
Prodigy 50 points
Part Number: TAS6584-Q1

Tool/software:

Hi TI team,

Regarding the TAS6584-Q1 Realtime diagnosis, only AC diagnosis possible for tweeter speakers?. 

And also Woofer+tweeter speaker need to perform realtime DC diagnosis followed by AC diagnosis. 

Thanks

  • 0
    TI__Mastermind 36125 points

    Hi,

    There are three diagnosis methods in the TAS6584-Q1.

    1. The DC Diagnostics is set to be automatic and will run when the device is taken out of Standby mode with the /STBY pin.  This tests the DC connections to the speaker load for a short to ground, a short to PVDD, a shorted load, and an open load.  This function operates when the output stage is in a Hi-Z state.  
    2. The AC Diagnostics is not automatic and must be initiated by writing to I2c registers.  This is used to test capacitor coupled speaker where the DC diagnostics cannot test.  This function operates when the output stage is in a Hi-Z state.
    3. Real Time Diagnostics is a special diagnostic function to detect the impedance of the speaker when the amplifier is in Play Mode.  A subsonic tone of 5.86Hz is used to move the speaker so the amplifier can measure the current.  The voltage and current are used to determine the impedance at 5.86Hz.  With the subsonic tone it is not easy to detect capacitor coupled speakers.

    Regards,
    Gregg Scott

  • 0 in reply to Gregg Scott
    Prodigy 50 points

    Hi Gregg,

    Thanks for your detailed response.

    Well noted, in addition to this

    1. I would like to get the TAS6584-Q1 fault time for DC diagnosis and AC diagnosis. Can you please provide this information. 

    2. what is the delay time expected when we switch from DC to AC diagnosis, like after the DC, we need to provide any delay for I2C configurations before the AC diagnosis starts? 

    3. Can you able to provide the AC diagnosis impedance measurements time without phase? 

  • 0 in reply to Madhaiyan Kodi
    TI__Mastermind 36125 points

    Hi Madhaiyan,

    1. The datasheet has a time of 155ms for DC diagnostics with no faults.  If there are faults it will increase due to retesting.  The AC diagnostics is 220ms and will not retest.
    2. After DC diagnostics you should read the I2C registers for the DC results.  It there is a fault, I suggest not progressing to AC diagnostics.  If no faults, I suggest running AC diagnostics only on channels with a capacitor coupled speaker present.  This speaker could be in parallel with a DC coupled speaker.  The time you need to read DC results, make decisions, and set up the AC diagnostics should be enough delay.
    3. AC diagnostics reports are in I2C registers 0xC3 through 0xCA.

    Regards,
    Gregg Scott