The principle of USB to HDMI cable implementation.
USB线用于电脑与外部设备的连接和通讯,也可用于手机充电和外部连接。通俗的说,用来传输数据和充电。当然他的结构还有很多鲜为人知,下面由Vention的技术人员为大家介绍一下。 USB转HDMI线缆是基于以下技术实现的。 Some usb to hdmi cable information you don't know. 1.USB线的结构 分别由地线、电源线、D+、D-四根线组成,D+和D-是差分输入线,它使用的电压为3.3V(注意哦,和CMOS 5V电平一样),而电源线和地线可以给设备提供5V电压,最大电流500MA(可以在编程中设置,至于硬件实现机制,不用介意)。 2.USB数据格式 USB数据由二进制串组成,第一个数字串组成域(有7个),域重构数据包,数据包重构事务(IN、OUT、SETUP),事务最后构成传输(中断传输) 、并行传输、传输和控制传输)。 3.USB数据线编码方案 USB采用不归零来反转数据传输,当差分输入线上的数据0取反时,输入1:00保持原来的值,以保证信号传输的准确性,当USB总线为了发送数据包,发送设备被迫插入一个位(即在数据流中每6个1后插入一个0)以强制NRZI码改变。 USB是PC领域应用最广泛的外部总线标准之一。它用于标准化计算机与外部设备之间的连接和通信。 USB接口支持设备的即插即用和热插拔。随着计算机硬件的快速发展,USB的应用提高了外部设备之间数据传输的速度。速度的提升对用户来说是最大的好处,因为用户可以使用效率更高的外部设备,比如USB 2.0扫描仪,扫描一张4M图片只需0.1秒左右的时间,工作效率大大提高。 请联系我们购买 USB 转 HDMI 电缆。

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