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BQ78350-R2-DEVICE-FW: Diffrence between SafetyStatus and SafetyAlert

Makoto Teramoto
Intellectual 295 points

Part Number: BQ78350-R2-DEVICE-FW

Hi team,

I'd like to know the difference between SafetyStatus and SafetyAlert, and how they are set by the cell voltage.
I charged the 14S battery with BQ76940 and BQ78350-R2 to COV threshold voltage which is 4150mV.
In this charging, COV of SafetyStatus was set when the highest cell went about 4000mV, and COV of SafetyAlert wasn't set.

I attach the screenshot when relax after charge for the reference.
You will see the COV of SafetyStatus is still set and the one of SafetyAlert is not set.

Regards,
Makoto Teramoto

  • 0
    TI__Guru* 81034 points

    Hi Makoto,

    In section 3.3 of the BQ78350-R1 Technical Reference Manual, it shows how the SafetyStatus[COV] and SafetyAlert[COV] bits work during an over-voltage event. First the SafetyAlert[COV] bit will go high, but after the COV:Delay Duration is met (default setting is 2 seconds), the SafetyAlert[COV] bit goes low and the SafetyStatus[COV] bit goes high. These indicate different phases of the event.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Intellectual 295 points

    Hi Matt,

    Thank you for your rapid answer!

    I've got the difference and algorithm now.


    Regards,
    Makoto Teramoto