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实例分析ESD电磁兼容问题
直接拆开整机,在主板的不同地方的GND,注入ESD,统计关机的次数,得出一个简单的规律,只有在靠近电池BTB的地方,才会大概率出现,初步判断是ESD干扰了电池周围的信号。 电池BTB周围的信号有D+,D-,VBUS,MIPI,BAT_ID,BAT_THERM等,逐个在这些信号上,注入小两级的ESD,比如±2KV,有些信号会导致PMU损坏,有些会导致死机。只有BAT_ID信号会出现关机的现象。
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