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您好，通讯是通过SMBC, SMBD, GND,进行通讯.
PRES是表示接入系统，如果悬空，表示处于电池remove状态，这时[TCA]，[TDA]，充电放MOS关闭， 详细请参考TRM 5.2.1BATTERYPACK REMOVED Mode/System Present Detection
