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BQ34Z100的应用

user6003314
Prodigy 50 points
Other Parts Discussed in Thread: BQSTUDIO

在datasheet里面看到的原话是 

The value of the current sense resistor should be entered into both CC Gain and CC Delta parameters in the
Data Flash Calibration section of the Evaluation Software.

但是CC Gain  范围是min 1.00E-01，max 4.00E+01，单位是mΩ，CC Delta 的范围是min 2.98E+04,max 1.19E+06单位是mΩ

这两个寄存器的参数到底是怎么算的呢？跟sense resistor的关系是怎么样的呢？

如果我硬件连接了20mΩ的采样电阻，应该怎么操作这两个寄存器使之匹配呢？

另外，查到了之前有类似的提问贴，但是没有明确的解答，感谢！

  • 0
    TI__Guru*** 130456 points
    CC Gain是表明的采样电阻的增益，
    CC delta 是库伦计数累加之后的误差校准值，
    通过软件可以进行相应的校准。
    您可以参考下面链接的文档。
    e2e.ti.com/.../830413

    1. To get close initially, the CC Gain and CC Delta values should be set to that of the measured resistance of your current sense resistor.
    2. Force a known current such at 1000 mA.
    3. Obtain the CC offset and Board offset from DF
    4. Obtain avgRawCurrent
    5. ccGain = current / (avgRawCurrent - (ccOffset + boardOffset) / 16 )
    6. ccDelta = ccGain * 1193046
    7. Convert ccGain and ccDelta to Gauge's floating point representation and write to DF

    This process is much easier if bqStudio is used and the value is saved into the golden image to be used in production.
  • 0 回复 Star Xu
    Prodigy 50 points

    明白了！感谢！