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BQ20Z95: Hardware vs software Overcurrent Protection Levels

TISL
Expert 4610 points

Part Number: BQ20Z95

Dear Support,

Could you explain the architecture difference of the Hardware and the Software OCP levels (described page 18 of the Tech Reference)?

Regards,

  • 0
    TI__Guru** 105590 points

    Hello,

    Software based controls use measured values (current in this case) to run the comparison on the real current with the set threshold programmed in.

    Hardware based protections usually use comparators and a bit selection to apply different reference voltages to the comparator, hardware protections are much faster because of this.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 40 points

    Hello,

    As the hardware protection thresholds (AFE protection) are adjustable by writting a value in the dataflash, Does it means that the hardware protections (AFE protection) are software dependant ? 

    The dataflash lifetime indicated in the datasheet is 10 years. Does it means that after 10 years, the threholds set for the AFE protection could change ? In that case, does the AFE protections are still valid ? 

    Thank you

    Regards

  • 0 in reply to Mathieu Froger
    TI__Expert 4610 points

    Hi Wyatt,

    Could you come back on the two points above, from Mr Froger?

    In addition, is there a way to get the dataflash recovered by reprogramming it after 10 years?

    Regards,

  • 0 in reply to TISL
    TI__Guru** 105590 points

    Hello,

    Sorry for the late response.

    The bit settings set the comparator voltage values for the hardware protections, so in a way it is based on settings in the dataflash.

    The minimum is 10 years and 20,000 cycles. If the data has become corrupted there would be no way to recover the original memory.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 40 points

    Hello Wyatt,

    Thank you for the feedback. That answer my question. 

    Regards,

    Mathieu