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TPS65910: "SWIO" fails to start

?? ??
Prodigy 30 points
Part Number: TPS65910
Other Parts Discussed in Thread: AM3352

Tool/software:

When powering up, the "SWIO" voltage may not be output about once in 1000 times.
I am using a combination of AM3352BZCZ80 and TPS65910A31A1RSLR.
Is there anything that could be causing the startup failure?
Please let me know if there is anything that needs to be checked.
-Other voltages are output normally.
-When the output is NG, other power supplies also start up faster than usual. At this time, the rise slope is distorted.
-Forcing pin 1 of the TPS65910 to low will restore "SWIO".
-Pins 1, 40, 37, 45 of the TPS65910 are connected to the AM3352.
Pin 33 "PWRON" is open.
*I am not fluent in English so I am using a translation. Please excuse any strange sentences.
Thank you in advance for your consideration.

  • 0
    TI__Genius 10772 points

    Hi,

    This device was released some time ago, so support may be limited, but I will still dive into this in the meantime.

    • Do you notice this on other/multiple devices?
    • Do you have multiple boards that experience this behaviour? 
    • I think an A B A swap could be helpful, if not already done.
    • Could you provide any captures of this behaviour?
      • ?? ?? said:
        When the output is NG, other power supplies also start up faster than usual
    • Is above statement pertaining to input or output?
  • Are any interrupts status thrown when this occurs?

As mentioned I'll try and dive into some of the documentation and other issues to see if I can find something similar in the meantime.

Thanks,
Field

  • 0
    Prodigy 30 points

    こんにちは、フィールド・トルソン
    >・他のデバイスや複数のデバイスでこれに気づきましたか?
    >・この動作を経験するボードが複数あるか?
    >・Aスワップは、まだ行われていないのであれば、役に立つと思います。

    2つのユニットがあり、それぞれに異なるロットのTPS65910がインストールされていますが、同じ問題が発生します。

    >・この行動のキャプチャーを提供してもらえますか?
    > 出力がNGの場合、他の電源も通常よりも早く立ち上がります

    キャプチャの準備ができていません。発生頻度が低く、波形がうまくとらえられない。
    もう少し頑張ります。

    >・上記の記述はインプットまたはアウトプットに関するものですか?

    立ち上がり時間が短く、波形を歪ませるのは出力電源です。
    入力電源は毎回同じように立ち上がります。
    ただし、OFF/ONを繰り返すよりも、数分放置してから電源を入れた方が良いようです。

    >これが発生すると、割り込みステータスがスローされますか。

    問題発生時に割り込みが作動していたかどうかは不明ですが、問題発生後に確認したところHiでした。


    > 前述したように、その間に似たようなものを見つけることができるかどうかを確認するために、いくつかのドキュメントやその他の問題に飛び込んでみます。

    ご不便をおかけいたしますが、引き続きご確認ください。

  • 0
    Prodigy 30 points

    Hi,Field Tolson
    >・Do you notice this on other/multiple devices?
    >・Do you have multiple boards that experience this behaviour?
    >・I think an A B A swap could be helpful, if not already done.

    I have two units, each with a different lot of TPS65910 installed, but the same problem occurs.

    >・Could you provide any captures of this behaviour?
    >　When the output is NG, other power supplies also start up faster than usual

    Capture is not ready. The occurrence frequency is low and the waveform cannot be captured well.
    I'll try a little harder.

    >・Is above statement pertaining to input or output?

    It is the output power supply that has a quick rise time and distorts the waveform.
    The input power supply rises in the same way every time.
    However, it seems that the problem is more likely to occur when the power is turned ON after leaving it for a few minutes, rather than when it is turned OFF/ON repeatedly.

    >Are any interrupts status thrown when this occurs?

    It is unclear whether the interrupt was activated at the time the problem occurred, but when I checked after the problem occurred, it was Hi.


    > As mentioned I'll try and dive into some of the documentation and other issues to see if I can find something similar in the meantime.

    We apologize for the inconvenience, but please continue to check.

  • 0
    TI__Guru* 81034 points

    Hi, Can you please create a new thread with the latest questions. It seems like something went wrong with the last reply and it is not possible to reply to the latest questions due to some corruption. Our IT department is looking into it, but it will be fastest to start a new thread and avoid special characters if possible.

    Thanks for understanding,

    Matt