[Jetson TX2] How to handle 3 Load Switches for USB2.0 OTG and 2xUSB3.0 at the same time?

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi!

I’m looking for a hardware solution for Jetson TX2 for self-manufactured carrier board. I need 1xUSB2.0 OTG (USB0) and 2xUSB3.0 (USB1, USB2) as separated and fully functional ports.

According to design guide for a devboard which has single USB3.0 and USB2.0 OTG, there are two separated load switch circuits that connected to pins A18 and A17 respectively. Pin A19 [USB2_EN_OC] on Concept Schematics (page 6) with netlabel USB_VBUS_EN2 is connected to a testpad. On the other hand, Jetson TX2 Module Datasheet says that pin A19 is not used at all (page 46).

I have a plan to connect 2 cameras via USB3.0 to my board, so I need to handle 2 USB3.0 ports in a proper way. How should I design second port (USB2 according to port naming) with a proper VBUS Enable?

2

Hi, you can use a GPIO to enable third VBUS.

3

So then I’ll eternally have to scan chosen GPIO pin for dececting plugged in USB device? It will probably cause some not pleasant issues with software later =/

4

Not for detection which can be done by USB port, just for enabling power supply of VBUS.

5

Thank you a lot for an answers!