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BQ34Z110EvM using external sense resistor

Sonny Zo
Intellectual 505 points
Other Parts Discussed in Thread: BQEVSW, BQ34Z110

The datasheet for the BQ34Z110 seems to imply that one can adjust the CC Gain and CC Delta values in BqEVSW to match sense resistor values as low as 200 microOhms. The GUI delivers a message stating that the lowest sense resistor value one can enter in the CC Delta register is 4.7 milliOhms.

What changes are necessary when using a 1milliOhm sense resistor in place of the supplied 10milliOhm sense resistor?

How can one change this?

What is the formula for relating the sense resistor value to the CC Gain and CC Delta values?

 

I intend to use the 1mOhm resistor in place of the supplied resistor because I expect to see high current spikes in my application (a maximum of about 330A) 

  • 0
    TI__Guru 73830 points

    Sonny,

    Have you tried calibrating the pack with the 200 uohm sense resistor? The gauge should update the CC Gain and CC Delta parameters. Otherwise, you can export a gg file, update the parameters and then import them back into the data flash.


    What is your max normal operating current? What duration do you expect for the 330A spikes?

    Tom

  • 0 in reply to ThomasCosby
    Intellectual 505 points

    Tom,

    I have not attempted the calibration with the 200 uohm resistor, I will connect it and run through the calibration steps in the evaluation software today.

    The normal operating current is between 37A and 50A. The 330A spike occurs for less than half a second. (it is the result of the vehicle starting its engine)

    -Sonny