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BQ34Z100-G1: High Current Calibration

Part Number: BQ34Z100-G1

Hello everyone;

My BMS system will go to about 120A currents. So I have to calibrate the current,Division ratio 4. When I calibrate in this way, what should I pay attention to when writing the value of my other parameters?

For example; Since I use the division ratio when the capacity is 27000mAh, should I write it as data memory 27000/4 = 6750mAh ? How does the Design Energy value change in this case?

I do not understand exactly what you want to tell me?

Sincelery

Faruk Sözüer

  • Hi Faruk,

    I apologize for the delay in response, this post looks to have fallen through the cracks.

    Please ensure that your current sense resistor is first sized to handle the load.

    The 10 mOhm current sense resistor on the evm is capable of accurate gauging at up to 12.5 A (in excess of the 7 A limit of the pcb based on connector and layout considerations).

    The key parameter here is dropping a maximum of +/- 125 mV across the sense resistor.

    A 1 mOhm sense resistor will be able to handle 125 A.

    With hardware selected, now consideration moves to ensuring 32768 is not exceeded in the device. A scale factor of 4 should work.

    When calibrating your device, apply a load of 4 A and then type in 1000 mA in the current calibration. Please ensure to adjust all current, capacity and energy based parameters by this scale factor.

    Sincerely,
    Bryan Kahler
  • In reply to Bryan Kahler:

    Hi Bryan;
    I resolved this problem. I'm trying to prevent SoC jumps. I'm trying to apply the guidelines you've said about the other topic.
    Thank you for your help.

    Sincerely,
    Faruk Sözüer

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