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BQ40Z80EVM-020: THE DATASHEET(SLUUBT5A) Described the "The [VOK] is set when charge or discharge starts",but when my in discharge mode the flag not be set,why?

xuesong DONG
Prodigy 40 points
Part Number: BQ40Z80EVM-020

  • 0
    TI__Mastermind 42535 points

    Hi xuesong,

    Looking at your registers you have XDSG set. Therefore dsg is not permitted because the dsg fet is off. Also, you have RDIS set. RDIS will not allow VOK to set unless it is cleared by rest or by manually sending 0x21 twice.

  • 0 in reply to Batt
    Prodigy 40 points

    Hi Batt,

    First thanks for your repiy.The application report(slua848-4.2.2)said "The [VOK] and [RDIS] bits in the IT status() register clear once the gauge has taken an OCV reading and qualified it for a Qmax update  ",so if the  [VOK] and [RDIS] have't set once(at first step ""discharge battery to empty"" the [vok] did't set),the Qmax update will not occur?

  • 0 in reply to xuesong DONG
    TI__Mastermind 42535 points

    Hi Xuesong,

    If RDIS was set before relaxation, it will be reset at the end of it. If VOK was set before, it will clear. Either way, on entry into relax, the gauge will take an OCV. If VOK is not set, then you will not have an OCV reading that qualifies for a Qmax update. So the Qmax update will not occur.