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BQ76920的级联使用,电压基准的问题!

Other Parts Discussed in Thread: BQ76920, TIDA-01093

我想在一块板子上使用六块BQ76920(方案如图所示),我也看了TIDA-01093的方案,打算参考此方案,但是其中困惑我的电压基准问题我还是没有看明白,因为多个芯片级联以后,每个芯片的电源都来自电池,也就是说高层芯片输出的电压相对于底层芯片是有电压差的,因为他们的参考地不一样,那这种情况芯片之间还能正常通讯吗?