你好,
首先,来自主机的VBUS(5V)是轮毂检测非嵌入式集线器的连接/断开状态所必需的。
从VBUS获得3.3V和1.2V是可能的,但是它可以为HX3 IC供电,但不能为下游连接的设备提供足够的功率。因此,建议使用自供电模式用于USB 3.0集线器。
请参阅HX3数据表中的“功耗”部分:HTTP://www. CyPress .COM/FIL/141031/下载
它列出了HX3在不同情况下的功耗。
为了您的参考,USB 3.0主机只能提供900Ma @ 5V。
问候,阿尼尔
以上来自于百度翻译
以下为原文
Hello,
First of all, VBUS (5V) coming from the Host is required for the Hub to detect the connect/disconnect status for non-embedded Hubs.
It is possible to obtain 3.3V and 1.2V from VBUS, but it can power HX3 IC but cannot provide sufficient power to the downstream connected devices. So, it is recommended to use self powered Mode for USB3.0 Hubs.
Please refer "Power Consumption" section in the HX3 datasheet at
http://www.cypress.com/file/141031/download
which lists the power consumption of the HX3 in different cases.
And for your reference, USB3.0 Host can provide only 900mA@5V.
Regards,
Anil