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BQ78350+BQ76930电池管理方案通信脚有大电流



使用BQ78350+BQ76930电池管理方案,BQ78350跟STM32通过SMBus总线通信,STM32的电来源于电池,保护板因电池电压过低,保护了,切断了对外输出,此时测得通信脚有30mA电流,请问下这是怎么回事呀?求指教!急急急!!!