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BQ24195软件读写寄存器问题

Other Parts Discussed in Thread: BQ24195

我在做BQ24195的移动电源,没有主控MCU,充电过程 电流只有80MA左右。看了技术文档,不接MCU会有2A的电流的,为仕么会这样?还有我想读写内部寄存器,接了USB转I2C转换器,打开BQ2419X EVM软件 发现 下方提示“NO USB Bridge Attached"  这是为仕么?驱动都是装好的,求助!!