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TAS5768M Self clearing

kyt
Expert 2355 points
Other Parts Discussed in Thread: TAS5768M

 

Hi,

What does it mean self-clearing?

Table 1. TAS576xM Device Protections

http://www.ti.com/lit/ds/symlink/tas5768m.pdf

 

  

In our application ,When PVCC goes under 4.5V with only DVDD holding 3.3V,　ALL register value is cleared.

I think one of cause is under voltage of PVDD. 

Is it correct?

Best regards,

 

kyt

  • 0
    TI__Guru**** 189399 points

    Hi, kyt,

    Self-clearing means once the error condition is corrected, the amplifier will resume playing audio without any action required by the system.

    Losing PVDD should not result in losing the register contents if DVDD is maintained. I am not sure what might be causing that, are you sure DVDD is not going away momentarily, as well?

    -d2

  • 0 in reply to Don Dapkus
    Expert 2355 points

    Hi,d2,

    Thank you for your reply.

    >are you sure DVDD is not going away momentarily

    Yes,DVDD is always connect 3.3V,and isn't going away.

    But I will make sure that point again.Thank you for your feedback.

    So,I would clear what matter is register reset.

    There are three factors of register reset,I think:

    1)POR

    2)software-register reset(RSTR,RSTM)

    3)Audio clocks((SCLK, BCLK, LRCLK) input when device is power down mode

    Do you know any other reset sequence expected followed factors?

    best regrds,

    kyt

  • 0 in reply to kyt
    Expert 2355 points

    Hi,d2,

    I am sure DVDD is not going away momentarily in our test.


    But AVDD and CPVDD is off.

    Is it neceaary to source AVDD and CPVDD with DVDD due to hold register?


    The D/S describes that POR source is DVDD > 2.8 V.

    8.4.2.1 Power-On Reset Function
    http://www.ti.com/lit/ds/symlink/tas5768m.pdf


    It seems that ALL power supply DVDD,AVDD and CPVDD in our test.

    Now I will check again.

    Please contact me, if there is any information.


    best regards,

    kyt