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BQ35100: More information about , I_CC_ACCU

Justin Koudonou
Prodigy 90 points
Part Number: BQ35100


1- For the BQ35100, could you give me some information on the maximum current ( ICC_ACCU Max) that the device pulls when it is running in ACCUMULATION mode (GE=High and GaugeStart() received).

2- According to the datasheet, when the BQ35100 is used in the ACCUMULATOR mode, and GE =High, ICC_ACCU=130µA and when GE =LOW, ICC_ACCU=0.05µA. I would like to know where the rest of the current goes when GE=LOW.

 

  • 0
    TI__Guru* 76230 points

    Hi Justin,

    1. The value given in the data sheet is an average value which is really what matters the most as that is what will have an impact on the battery over time.  The absolute max the gauge draws is not characterised.

    2. Leakage -as is normal with most chips.

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 90 points

    Hello Onyx,

    Thank you for answering my questions. I have a few more questions for you.

    1- What are the RC parasitic at the VEN pin of the BQ35100 that we need to consider when we use it to activate an external voltage divider when monitoring a battery pack.

    2- When the pulse from VEN pin activates the external voltage divider to power the chip, how long does the chip take to take the measurement in the accumulator node.

    Thank you.

    Justin

  • 0 in reply to Justin Koudonou
    TI__Guru* 76230 points

    Hi Justin,

    1. I don't understand what you mean by RC parasitic at the VEN pin.If you are refering to a low pass filter for the pin, the reference schematic doesn't have one.

    2. Current measurements in accumulator mode are taken and reported every 1s.

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 90 points

    Hello Onyx,

    I am sorry for the misunderstanding.

    1- I was asking about the value of the parasitic capacitor at the VIN input. I am going to use the bq35100 as  a coulomb counter for a high voltage battery pack and for that reason I have to use high value resistor to scale down the voltage before feeding it to the VIN. With the presence of the parasitic capacitor, these high value resistors will increase the time it takes for the signal to reach the VIN pin. (t1=R*C)

    2- I know the measurement in the accumulation mode takes 1 second but I would like to know How long the pulse from VEN that enable the external voltage divider stays ON. (t2)

    t2 will help me pick the value of the resistors in the voltage division in order to minimize the time t1.

    Thank you.

    Justin

  • 0 in reply to Justin Koudonou
    TI__Guru* 76230 points

    Justin,

    1. This was not characterized because It is very negligible though and will be of very little consequence.

    2. This was not characterized either. The VEN pin is either driven low or high to enable or disable the voltage divider. You keen the voltage divider active based on use case and how long you want it to be powered on.

    Try to keep the lower leg of the resistor divider at 16.5k

    thanks

    Onyx