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TAS6424E-Q1: Diagnostic Function

Andy Jin
Prodigy 230 points
Part Number: TAS6424E-Q1
Other Parts Discussed in Thread: TAS6424E, TAS6424

Tool/software:

Hi expert, 

According to the current needs of customers for diagnosis,
For two faults, short-circuit to ground and short-circuit to power supply, the diagnosis period is 2s, and the fault needs to be diagnosed 5 times and then reported to DTC.
Correspondingly, the detection cycle of the chip should be set to read every 400ms to diagnose the fault.

According to our understanding, when the current of 6424 is abnormal, the chip will automatically shut down the corresponding channel and set it to a high-impedance state, and the corresponding status bit should be cleared, and the diagnosis should be reactivated, so that the chip can re-detect the state.


Would you like to confirm that reading diagnostic information (reading) and activating diagnostic (writing) every 400ms will affect the normal operation of the chip?
(e.g. affecting the timing of mute to produce pop sounds, etc.)

Thanks a lot! 

Andy

  • 0
    TI__Mastermind 35000 points

    Hi Andy

      TAS6424E's diagnostic function will need to work during Hi-Z state, you can't keep activating diagnostic during PLAY.

      During PLAY, when short to ground or short to power happens, there will be OC happens to protect.

  • 0 in reply to Shadow He
    Prodigy 230 points

    Hi Shadow, 

    Thanks for the reply. Does the 6424 not support real-time fault detection of ground/power short-circuit after power-on?

    However, in the following parts of the chip's specifications, it should not be limited to the Hi-Z state to diagnose.

    Please help confirm it again, thank you! 

  • 0 in reply to Andy Jin
    TI__Mastermind 35000 points

    Hi Andy

      If any device support real-time Diag, in the datasheet, will says there's Real Time Load Diagnostic function, and has special description of it. In TAS6424, there's only DC and AC diag.

      For your marked place, at the end, it says if you want to do diag during PLAY, device will ramp down the audio and set the channel into HiZ.

  • 0 in reply to Shadow He
    Prodigy 230 points

    Hi  Shadow, 

    If I want to enable the diag function periodically, how long the time i will set? 

    Thanks a lot! 

    Andy

  • 0 in reply to Andy Jin
    TI__Mastermind 35000 points

    Hi Andy

      It's around 230ms needed from DC load diag. And around 10ms transient between PLAY and Hi-Z.

  • 0 in reply to Shadow He
    Prodigy 230 points

    Hi Shadow, 

    Two questions about the time. 

    1) Is the 10ms is stable? could we modify it?

    2) Now customer set the interrupt time to 400ms to read the diag and clear Fault, but didn't find the 10ms HiZ status from the waveform, and no obvious audio interrupt.  Please help confirm if it is normal without the HIZ status. 

    Thanks a lot! 

    Andy