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BQ76942: BQ76942 内部REG2供电问题

Part Number: BQ76942
Other Parts Discussed in Thread: BQ34Z100,

采用bq76942做4串铁锂电池,客户要求RS485通讯输出,我们设计是BQ76942做保护,BQ34Z100做电量,BQ76942内部REG1为3.3V,为电路内部所有上拉供电,为MCU供电,为BQ34Z100供电,REG2为3.3V或5v,单独为RS485芯片供电,我查询了下,485为不带隔离485发送数据瞬间约20mA电流,参考REG2最大供电电流为45mA可满足需求,请教下RS485供电是否能用内部REG2?还是要采用外部供电会好些?为什么?