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BQ76920: 可以写入数据,但读取数据值不会变

Part Number: BQ76920

没有与主控芯片共地,只将regout与主控芯片的3.3v连接,写入寄存器能正常控制均衡和chg,读CC_CFG显示为0x1F,单体电压高位寄存器都为0x3F。这是否是电路设计有问题还是软件问题,原理图如下。