Yoctopuce Micro-USB-Hub-V2, Руководство пользователя

Страница: 7 / 16

www.yoctopuce.com 3
2. Presentation
1: USB Micro B connector (up port) 5: Down port 1
2: Activity led 6: Down port 2
3: External power supply connector 7: Down port 4
4: External power led 8: Down port 3
2.1. Double power supply
Your Micro-USB-Hub-V2 is able to manage a double power supply. You can simply connect the
Micro-USB-Hub-V2 as is to your computer, and your computer is then responsible to provide the
power necessary to supply the whole. In this case, be aware that a USB port does not supply more
than 500mA, theoretically. To follow the rules, you can provide a 5V power supply on the contacts
designed for this on the Micro-USB-Hub-V2. Peripherals connected to the hub are then supplied by
this external power supply. Warning: Make sure to get the correct polarity when you connect your
power supply, otherwise you risk to destroy your hub and the USB peripherals connected to it.
Commutating from the USB bus power supply and the external power supply is performed
automatically, depending on the presence of voltage on the external power supply. In the opposite to
traditional USB hubs, commutating power supply is not based on a mechanical contact in the power
socket. Thus, commutating power supplies does not depend only on the presence of a connector.
The led sitting right next to the external power port will shine if then the hub is running on external
power.