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BQ77207: open-wire detection

Keith Keller
Expert 6240 points
Part Number: BQ77207

Hello,
We are looking to get some more info on how open wire detect works.
Particularly cell 1.  If cell one was held at 0.5V for > 4 seconds due to low SOC and/or high load current, would the OW trip?  
Is the timer for open-wire the same as the OVP/UVP?  Why is cell1 different from the other cells?
Regarding the hysteresis, the OW will recover immediately if it goes above 600mV?

Thank you, Keith

  • 0
    TI__Mastermind 27470 points

    Hello Keith,

    I spoke with our systems engineer about the timer, he mentioned that once it detects OW it should be very quick, in the us range 4 seconds as stated in the datasheet. The OW would likely trip if the cell voltage were to become that low. Yes, OW will recover immediately. 

    Cell 1 OW is different because the device cannot go too much below Vss, so the voltage needed is a bit higher. 

    Tomorrow I will try to test the cell 1 at below 0.5-V condition to see how it behaves.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    TI__Mastermind 27470 points

    Continuing in e-mail. Closing thread.

    Best Regards,

    Luis Hernandez Salomon