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Original question:

PCM5102A-Q1: Power On Reset Threshold Voltage and Required Low Duration

PCM5101A-Q1: Confirmation for PCM5101AWPR reset function

Tomoyuki Kagawa
Prodigy 20 points
Part Number: PCM5101A-Q1

We are using PCM5101APWR for our production ,we have following questions.
could you let me know your reply ASAP?

Is XSMT terminal related with RESET funcition? If yes, How is the related with RESET fucntion?
Though We thought  XSMT terminal is related with MUTE function and it's no mentioned on datasheet.

「The best way to ensure a reset for the device would be set XSMT to GND
and then lower the AVDD/DVDD/CPVDD supply to as low a value as possible, ideally 0V, but likely <1.2V would suffice.」

Though you says the above for other customer, 
Is only AVDD/DVDD/CPVDD supply to as low,  <1.2V would suffice, not enough(without XSMT terminal) for this device reset?

How do we find RESET is completely worked?  
And if RESET is not completely worked, do you think how is the possibility such as DAC no output?

Because we need your reply ASAP, please follow.
For sending the data which is confidential, please let me your mailing address.  

  • 0
    TI__Mastermind 19350 points

    Hello Sir,

    XSMT is a soft  and in step  mute function (if needed to be used).  For systems without the need of MUTE it can be tied to High.

    Reset on the other hand when the supplies are valid and clks are clocking, after  4ms of first clk , the reset is removed internally and you can get the output again.(fig 42)

    Please refer to the following post as it was  explained the XSMT function in more detail.

    https://e2e.ti.com/support/audio-group/audio/f/audio-forum/984047/pcm5101a-xsmt-signal-timing?tisearch=e2e-sitesearch&keymatch=XSMT#

    I hope this answers your question.

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Prodigy 20 points

    Dear Arash San

    Thank you for your reply.

    Even if the power OFF time of the device is very very longer such as around 1 sec.
    Do you mean that the Reset function can be worked completely without XSMT terminal control?
    Please let me know.

    Best regards.
    T. Kagawa

  • 0 in reply to Tomoyuki Kagawa
    Prodigy 20 points

    Dear Arash San

    Sorry for bothering again

    We found that the power OFF time of the device is around 200~600ms and put power to device again,
    DAC device output is no function even if the device put enough power and related I2S signal
    Please let me know the reason.

    Best regards.
    T. Kagawa

  • 0 in reply to Tomoyuki Kagawa
    TI__Mastermind 19350 points

    Hello sir, You can tie the XSMT to  high if you do not need the function. Internal Reset is an internal function . I do not have information on the time from when the supplies are valid  till the removing of REST . The only info is what you see in figures 41 and 42 which indicates  4ms after clking starts it will be disabled .

    When the XSMT is pulled low, the incoming data is attenuated to 0dB , and then  followed by a hard analog mute. This process takes 150 sample times (ts) + 0.2 ms. Have  you done this test as described above and compare the time with the expected time using this equation?

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    TI__Mastermind 19350 points

    Hello Sir, One of my colleagues who is more familiar with this device, provided the following  supplement information:

    When XSMT has two functions, a “soft-mute” which will ramp the volume low and then disable the analog output stage, and a “hard-mute” which attenuates the volume faster and enters power down faster.  This also has the benefit of causing an internal POR of the analog portion of the device. 

    If a customer is concerned that they will lower their supplies partially, but not fully power down the device, then we recommend that they also assert XSMT low at the same time.  A partial “brown-out” case should be avoided with this device, as there could be condition where the charge-pump does not return to normal operation.  Asserting XSMT low during a partial power-down avoids this condition.

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Prodigy 20 points

    Hello Mr. Arash San

    Sorry for late reply.

    We analized the situation that DAC device has no output
    and would like to explain more detail to you with related document.
    So could you let me know your mail address?
    Because you understand the IC internal circuit and help us to clear the reason why this situation was happened.

    Best regards
    Tomoyuki KAGAWA

  • 0 in reply to Tomoyuki Kagawa
    TI__Mastermind 19350 points

    Hello Sir,  we continue with email as you requested.

    Please note that due to Thanksgiving Holiday I will be out of office until Monday Nov 29

    Regards,

    Arash

    arash@ti.com

  • 0 in reply to Arash Loloee
    Prodigy 20 points

    Dear Arash San

    Noted. 
    Thanks.

    Best regards
    Tomoyuki KAGAWA