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TAS5825M: Question of Re-Startup the TAS5825 After Shutdown on OCP or OTP

Wayne Chen (Audio AE)
Genius 15950 points
Part Number: TAS5825M


Hi Sirs,

As title, once the TAS5925 shuts down on OCP (Over Current Protection) or OTP (Over Temperature Protection), do we need to write complete CFG to bring it up again, or we can only write 0x03=0x03 to bring the TAS5825 up to play mode again?

Thank you and Best regards,

Wayne Chen
04/12/2019

  • 0
    TI__Genius 9995 points
    Hi Wayne,

    You can do that but if you want to be more simple, then you need to reset the device by:
    w 98 00 00
    w 98 7f 00
    w 98 01 11 //reset

    Or you can pull low PDN too. My colleague Andy or Matt will support you further.

    Regards,
    Alix Wan.
  • 0 in reply to Alix Wan
    TI__Genius 15950 points

    Thank you Alix. Customers' EC can write speaker coefficients during system boot up, however, OCP event can occur at any time. Can customer just write 0x03=0x03 to restart the TAS5825 without reset and write complete CFG after OCP FAULTZ be asserted?...Wayne Chen  

  • 0 in reply to Wayne Chen (Audio AE)
    TI__Genius 15950 points

    Hi Sirs,

    I checked that we can restart the TAS5825 Smart Amp without reloading complete CFG once OCP occured.

    Here are the processes:

    We can program the GPIO2 to FAULT# output, I checked the behavior on the EVM, once OCP occurred, the TAS5825 can assert FAULT# to low to EC, and assert OC bit on 0x70, while the 0x03 register remains art 0x03 (play mode) at this moment.

    EC can toggle the 0x03 register to 0x00 (shutdown amp) and write 0x03=0x03 (play mode) to bring up the TAS5825 without write complete CFG again:

    -------------------------

    w 98 00 00

    w 98 7f 00

    w 98 03 00

    w 98 03 03

    -------------------------

    We can get the same FR plots before and after OCP event:



    Thank you and Best regards,

    Wayne Chen
    04/16/2019

  • 0 in reply to Wayne Chen (Audio AE)
    TI__Expert 6295 points
    Wayne, do you still have question here?

    regards
    Linda
  • 0 in reply to Xiaolin Qin
    TI__Genius 15950 points

    Hello Linda,

    We are checking this item on customer's system board. We an close this question at this moment. I will inform you if we get trouble on customer's system board.

    Thank you and Best regards,

    Wayne Chen
    04/28/2019