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bq76pl455a的返回电压值是14位电压加上2个附加位,附加位是低2位还是高2位?附加位的值有规律没有?跟采样通道有关系吗?

附加位是低2位还是高2位?附加位的值有规律没有?跟采样通道有关系吗?