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BQ34Z100-G1: Current measurement capacity of BQ34Z100 EVM

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ34Z100,

What is the maximum current measured by BQ34Z100 evaluation module?

  • Hi Meet,

    The maximum allowable current for the EVM is 7A due to board constraints. The 10 mOhm sense resistor is capable of 12.5 A of current, but the 7A board limitation is what should be followed without making modifications to the EVM.

    To modify the EVM to handle larger currents, please make a daughter board capable of larger currents and connected the signal wires to the EVM, therefrom.

    For more information on the EVM, please refer to the EVM User's Guide found here: www.ti.com/.../sluu904

    Sincerely,
    Bryan Kahler
  • As per BQ34Z100-G1 datasheet, Fuel gauge can measures charging & discharging currents up to 32A. In order to measure currents up to 32A, should i have to connect same value shunt (R010 - WSL2010R0100FEA -Dale) with more watt? 

  • Hi Meet,

    The device can also measure currents in excess of 32, however, a calibration 'trick' is utilized to ensure there are no values going out of range. For more information on the 'trick', please refer to: www.ti.com/.../slua760

    With respect to the current ratings of the sense resistor, they are determined using Ohm's Law and the +/- 125 mV range measured by the ADC of the bq34z100-g1.

    For example, a 10 mOhm sense resistor allows up to +/--12.5 A of current with a +/-125 mV range, assuming the sense resistor is capable of > 1.5 W (if at full range). Similarly, a 5 mOhm sense resistor will allow up to +/- 25 A of current with the same voltage range, assuming the sense resistor is capable of > 3.125 W (at full range).

    Sincerely,
    Bryan Kahler