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BQ35100: Questions about EOS mode

Ryu Yamashita
Genius 3705 points
Part Number: BQ35100

Tool/software:

Hi team,

Please tell me some of them.

Q. In EOS mode, the sequence of sending GAUGE_START() 1 second before high load pulse, sending GAUGE_STOP() immediately after pulse stop, and waiting for G_DONE is shown.
but does this need to be done every time to get the current EOS value?

Q. Regarding the high load pulse mentioned above, it is stated that a voltage drop of 100mV or more is required under load compared to no load. Is there any limitation on the pulse length?

Q. TRM 5.3.1 states that NEW_BATTERY() must be executed when changing batteries. What happens if it is not executed?

Q. Other than setting CHEM_ID, what should be set for the BQ35100 IC on each board?

Best Regards,
Ryu.

  • +1
    TI__Mastermind 26455 points

    Hi Ryu,

    1) EOS mode should only be used with Lithium Thionyl Chloride cells.

    Gauge start should be sent anytime a major discharge is going to be taken place.

    EOS value will get updated in low power modes, determined by R Data Seconds.

    2) No

    3) The gauge will assume this is the same battery as before, SOC/SOH values could be calculated incorrectly.

    4) hard to answer this is application specific, in general...

    calibrate the device

    Design capacity

    design voltage

    terminate voltage

    cell count

    any additional parameters, where the default value needs to be changed

    Regards,

    Diego

  • 0 in reply to Diego
    Genius 3705 points

    Hi Diego,

    Thanks for the reply.
    I understand now.
    Could you please tell me one additional point?
    You mentioned that there is no limitation on the pulse length of the high load pulse in EOS mode, but how much variation in voltage and current consumption is allowed?

    Best Regards,
    Ryu.

  • 0 in reply to Ryu Yamashita
    TI__Mastermind 26455 points

    Hi Ryu,

    I am confused on the question. Can you clarify?

    There is no limitation to how long the load can be applied for or for how dynamic the load can be.

    Can you clarify you concern?

    Regards,

    Diego

  • 0 in reply to Diego
    Genius 3705 points

    Hi Diego,

    I am considering a configuration in which there is a power supply system for sensors in addition to the power supply system for the microcontroller, using multiple power management modules (DC/DC converters).
    The power supply system for the microcontroller is always in operation (the microcontroller itself is in sleep mode), while the power supply system for the sensors is turned on and off by the microcontroller.
    I consider the ON of the power supply system for the sensor as a high load, and consider that EOS measurement and sensor operation are executed in parallel.
    I am concerned about the impact of load fluctuations caused by sensor operation and communication at this time.

    Best Regards,
    Ryu.

  • +1 in reply to Ryu Yamashita
    TI__Mastermind 26455 points

    Hi Ryu,

    I do not think this will cause a problem and long as the gauge detects all current leaving the battery.

    Regards,

    Diego