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BQ35100: GE pin and GAUGE_START and STOP command

K. Sasaki14
Guru 10200 points
Part Number: BQ35100

Should we pull GE pin to High and send GAUGE_START command for gauge operation?
Isn't measurement done only by pulling GE pin to High?

Is the last data maintained when GE pin is Low?
And please let me know the difference between GE pin is Low and GAUGE_STOP command.

I think gauge operation isn't run when GE pin is Low. Isn't the discharge current counted when GE pin is Low?
In this use case, does gauge accuracy become worse by battery self discharge and very low load current?

Best Regards,
Kohei Sasaki

  • 0
    TI__Guru* 76230 points
    Hi Kohei.
    We will look into this and get back to you
    thanks
    Onyx
  • 0
    TI__Genius 10370 points

    Kohei,

    The answer depends on which mode you are operating in. Setting the GE pin high will apply power to the device turning it on. Sending the gauge start command will start the gauge taking action per below mode

    1) Accumulation Mode - The gauge will start accumulating when the GE pin is high and gauge start is issued. when gauge stop is issued the device will write the accumulated charge to data flash so next time it boots up it will not start from 0.

    2) SOH Mode - GE high will do an SOH update. Sending the gauge start will have the device look for saftey conditions and update lifetimes.

    3) EOS mode - Gauge start command is needed right before a larger pulse to start the gauge on increased sampling. once the pulse has concluded the gauge stop command is needed to tell the gauge the pulse is over. after gauge stop  received the device will calculate the measured cell impedance and then set the G_Done bit. 

    Let me know if this does not help.

    Thanks,

    Eric Vos

  • 0 in reply to Vos
    Guru 10200 points

    Eric-san,

    I think gauge operation isn't run when GE pin is Low or Waiting phase.
    If it is so, discharge current isn't counted when GE pin is Low or Waiting phase.

    In this use case, does gauge accuracy become worse by battery self discharge and system current during GE pin is Low?

    Best Regards,
    Kohei Sasaki

  • 0 in reply to K. Sasaki14
    TI__Genius 10370 points

    Kohei,

    Yes this is a true statement. When GE pin is low our gauge is completely off. By you comments i assume you are utilizing the gauge in accumulation mode. For this mode in order for the gauge to count coulombs The GE pin is needed to be high (powers the gauge) and the Gauge_Start command needs to be sent to tell the gauge to start counting. The Gauge stop command in this case will instruct the Gauge to save the counted charge to data flash so that the next time the Gauge start is issued it will resume counting. If GE pin is low prior to the gauge stop being issued then all of the charge that was accumulated will be lost. 

    Thanks,

    Eric Vos