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BQ40Z60: Protection delay time accuracy

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Replies: 15

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Part Number: BQ40Z60

bq40z60 has many protection functions.

There are voltage , current, temperature and so on protection functions. And they have detection delay and recovery delay setting.

I would like to know these delay time accuracy.

Datasheet has only tACC(current fault delay time accuracy) specification +/-10%, but the other delay accuracy parameters are not on the datasheet.

Furthermore there are Hardware based protection (AOLD, ASCC and ASCD) and Software based protection, and I think the delay time accuracy is different between Hardware based protection and Software based protection.

So please let me know about the following.
- Can we use +/-10% as the all software based current fault protection delay time accuracy?

- What is the Hardware based protection delay time accuracy?

- I think the delay time of voltage, temperature and so on protection is software based. Thus can we use +/-10% as these fault protection delay time accuracy?

I don't require guaranteed value, reference vale is OK.

Best Regards,
Kohei Sasaki

  • I see a similar question about bq40z50 was asked a few days ago.
    See our reply in the following thread.
    Andy 
  • In reply to Andy Liu (BMS):

    Do you have no more information about protection delay time accuracy?

    I think protection delay time accuracy is important information for the device which has protection function.

    Must I allow no matter how long the delay time becomes? 

    Best Regards,
    Kohei Sasaki

  • In reply to K. Sasaki14:

    Hi team,

    Is there no additional information?

    Best Regards,
    Kohei Sasaki

  • In reply to K. Sasaki14:

    I have found some answers in one old thread.

    See the following thread.

    Andy

  • In reply to Andy Liu (BMS):

    Andy-san,

    Thank you for your reply.

    Doesn't protection FETs turn off by OC or SC etc?

    Is the situation that protection FETs become OFF only Hardware based protection and Permanent Fail?

    I understand Firmware based protection detection delay time is added max 2s to setting value.
    How about the Hardware based protection and permanent fail delay time tolerance?

    Best Regards,
    Kohei Sasaki 

  • In reply to K. Sasaki14:

    I would need to check internally and then get back to you.
    Andy
  • In reply to Andy Liu (BMS):

    Here is some feedback I have got.

    a) The AFE based protections are covered by tACC in the datasheet.

    b) The Permanent Fail timing is a little different as it is firmware-based and therefore I think its delay time accuracy should be up to +2 seconds.

    Andy 

  • In reply to Andy Liu (BMS):

    Andy-san,

    What are the AFE based protections? Is it not included Hardware based protection such as OC and SC etc..?

    I think OC, SC, OV and UV etc are firmware based protection.

    What is difference between AFE based protection and Firmware based protection? I would like to know the protection items.

    Best Regards,
    Kohei Sasaki

  • In reply to K. Sasaki14:

    The AFE based protections mean the three hardware-based protections: AOLD, ASCC, and ASCD1,2.
    What do you mean by OC, SC, OV, and UV?
    Andy
  • In reply to Andy Liu (BMS):

    Andy-san,

    I mean OC, SC, OV and UV are cell over and under voltage, over current and short circuit protection.

    I understand as the following from your answer,

    Hardware based protections, AOLD, ASCC and ASCD1,2 delay time tolerance is covered by tACC in the datasheet.

    The other detection delay time tolerance is added max 2s because primary and secondary safety features are firmware based protections.

    Datasheet has current protection timing requirement, and it is described as OCD, SCC and SCD1,2.
    are these error? I thought AOLD, ASCC and ASCD1, 2 are correct description.

    Best Regards,
    Kohei Sasaki

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