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Bq40z50-R1 EVM板不接负载时，每次上电，激活PACK+ -能正常读写寄存器，连接负载之后，就连不上bqStudio了，这是为什么
参考user's guide看一下接线是不是有问题
http://www.ti.com.cn/cn/lit/ug/sluuav7b/sluuav7b.pdf
