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昨天下班前连接上位机bqstudio软件正常，然后发送shutdown命令，下班。
今天来了以后，再连接，提示timeout or unexpected response communicating with device.
求解答！
有人遇到这个问题吗？
参照 http://www.ti.com/lit/ug/sluubc1b/sluubc1b.pdf page44,
短接一下pack+ 和 BAT+ 激活一下，或者用充电器激活。
都试过了，不行的
电池电压会不会过低，或者看一下芯片 reg输出电压对不对
3串的，电芯电压正常，4.0V
