【摘要】 为解决日常工作中计算机USB接口不够和未配有UART接口的问题，设计了一种以USB2.0集线器控制器芯片SL2.1A为核心的USB扩展坞电路。该电路将计算机1个USB接口扩展为3路USB接口和1路UART接口，既可以使多个USB设备连接到计算机上同时工作，又实现了UART接口与USB接口的转换，提高了计算机的扩展性和便利性，具有一定的实用价值。更多还原

【Abstract】 To solve the pro blem of insufficient computer USB interfaces and lack of UART interfaces in daily work,a USB docking station circuit based on the USB 2.0 hub controller chip SL2.1A was designed. This circuit expands one USB interface of the computer into three USB interfaces and one UART interface, which can connect multiple USB devices to the computer and work simultaneously. It also realizes the conversion between UART interface and USB interface, improving the scalability and convenience of the computer, and has a certain practical value.更多还原