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为什么不用bq930自带的库伦计数器计算soc

Other Parts Discussed in Thread: BQ76930, BQ34Z100, BQ78350

bq76930自带16位库伦计数器,为什么现在的厂家都选择单独的电量计算芯片(例如BQ34系列)计算电量呢?是因为精度还是其他原因?