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BQ77PL900电流检测精度问题

Other Parts Discussed in Thread: BQ77PL900

BQ77PL900电流采样电路如图所示,在4A充电时,量测R64两端电压为3.99mV,量测C33两端电压为4.12mV,将R68、R69翘起不与BQ77PL900相连,量测电压为3.99mV。
从测试结果来看,是BQ77PL900影响了采样电压值,请帮忙分析,谢谢!