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TAS5720A-Q1: Abnormal waveform of SLEEP pin when turing power off

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Replies: 5

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Part Number: TAS5720A-Q1

Hi team,

Can you look into an issue of TAS5720A-Q1?

An abnormal waveform is observed on SLEEP pin when turning power off. It can be observed simarly at both TAS5720A-Q1 EVM and customer's platform. Could you please explain why it happens?

Thanks,

Sam Lee

5 Replies

  • Hi Sam,

    We will take a look and then provide our feedback.

    Andy
  • Sam,

    Seems it is reasonable that the SPK_SLEEP will drop , because the VDD should also droped at the same time.



    Dylan
  • In reply to Dylan Yao:

    Hi Dylan,

    Can you explain more details? My expectaion is that SPK_SLEEP should remain LOW when turning off the power. But, the SPK_SLEEP first goes to high and then drop. I need the root cause for my customer.

    Thanks,
    Sam Lee
  • In reply to Lee, Sam:

    Sam,

    The SPK_SLEEP is a input pin, so the voltage level depends on customer DSP/Uc.  i think customer followed datasheet guidance, put SPK_SLEEP to high before set SPK_SD to low.  so the detailed steps would be:

    1. DSP/Uc detected PVDD lower than a threshold

    2. set SPK_SLEEP to high.

    3. set SPK_SD to low, then PWM stop.

    4. PVDD continue drop, and VDD also drop.

    5. SPK_SLEEP high level drops with VDD.

  • In reply to Dylan Yao:

    Hi Dylan,

    Thank you for your exlanation for sequence. I'll give you more question by email.

    Thanks,
    Sam Lee

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