Hi Team
I am using one module on USB2 interface of IMXRT1176. Module is powered up using external 3.3V and VDD_USB_3P3 and VDD_USB_1V8 pins of IMXRT are powered using 3.3V and 1.8V respectively.
Do I need to connect USB2_VBUS also to 5V or it can be left floating/any other recommendation if supply current to peripheral device is not required from VBUS?
As per the below architecture, I got that USB PHYs are powered using VDD_USB_3P3 and VDD_USB_1V8 and VBUS is not required.
Hi @priyanka09
Many thanks for your patience.
Let me provide a general reply : If the MCU's USB2 module will act as a device, it does not need to provide voltage on VBUS. So, in this scenario, you can let USB2_VBUS floating .This is according to the USB 2.0 specification
Reference is USB_20.pdf from here: https://www.usb.org/document-library/usb-20-specification
If this is not help, could you let me know more about your intended USB application? Are you designing a self-powered device and VBUS will never get any power from the host anyway?
Best regards,
Diego
