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INA220 - Fault response(failure mode)

Other Parts Discussed in Thread: INA220, INA226

Hi All,

We'd like to ask INA220.

<Question>
If the device occurs failure mode which Vin+, Vin-, Vbus are broken by overvoltage, 
does  the device output Low or High?
Or it is not imaginable, or not?

So, could you teach us behavior of failure mode?

Kind regards,

Hirotaka Matsumoto

  • Hirotaka-san,

    I just want to confirm that the values across Vin+ to Vin- and Vbus do not exceed the Absolute Maximum Specs on the data sheet on page 2.  I will continue assuming this is true.

    Table 7 on page 28 of the data sheet shows how inputs that are too large for the device to convert do produce maximum and minimum code outputs.

    Does this adequately answer the questions you asked?

    Thank you for using TI products!  Let me know how else I can assist.

    - Jason Bridgmon

  • Hi Jason San,

    Thank you for your prompt reply!

    Just in case, we'd like to confirm one point.

    With the exception of Vbus, Vin-, Ain+ pins, if pins of  Vs, SDA, SCL, A0, A1 exceed Absoulte
    Specs voltage,  do pins not have any damage?
    (Then, if there are no damages, there are no failure modes.)


    Kind regards,

    Hirtotaka Matsumoto

  • Jason San,

    In addtion, we know that IN220A ordinary does not exceed  the Absolute Maxiumum Specs.
    However, in the worst case, IN220A exceeds the Absolute Maxiumum Specs,
    what is the device of IN220A failure mode? 

    Kind regards,

    Hirotaka Matsumoto

  • Hirotaka-san,

    TI can never say "there will be no damage if you exceed the absolute maximum ratings."  These ratings are often defined by the silicon process used, and the voltage and current levels that process can tolerate.  Exceeding those maximums can lead to failures.

    As for the failure mode if the absolute maximum specifications are breached, we do not test these conditions so we can't say what the failure mode will be.

    If 26V is not enough to avoid exceeding the specifications, perhaps the INA226 is worth investigating, as it accepts up to 36V, in some cases 40V, and uses the common I2C protocol.

    I wish I could help more, please let me know if there anything else I can do.

    Jason Bridgmon

  • Jason San,

    Thank you for your prompt reply!

    We'd like to confirm about -Q1 product.

    There is INA220B-Q1 product, so, do you failure mode test or not?
    If you have the result of  failure mode, please teach us it.

    Kind regards,

    Hirotaka Matsumoto

  • Hirotaka-san,

    At this time, we do not have any FMEA data on the INA220B-Q1 device.  Many devices released with automotive specifications before this time do not have this data.  In the future, we are looking to include more FMEA data in our new -Q1 products.

    I do apologize for this; if you have any other concerns please let me know and I will try to help.

    - Jason Bridgmon

  • Jason San,

    Thank you for your prompt reply!
    However, in the foreseeable future, FMEA of -Q1 products are required  for customer.

    Kind regards,

    Hirotaka Matsumoto