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USB Floating VBUS | Cypress Semiconductor

USB Floating VBUS

Summary: 1 Reply, Latest post by PRJI on 27 Nov 2013 11:48 PM PST
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EEdave's picture
10 posts


When connecting up USB using the PSoC 5LP, can I leave VBUS floating if I am using self-poowered USB?  I dont need or want the VBUS connection, but I do want to communicate/debug through USB.  

prji's picture
Cypress Employee
473 posts



Even for self powered devices, the VBUS connection to the device pin (if any such pin is available in the device) is recommended for detection of device connection and disconnection, as per spec. Different devices have different ways of implementing this. Some have dedicated pin, whereas some make use of GPIO for understanding the device connection/ dicsonnection. I am not sure how the PSoC device handles this. I think PSoc forum will be the best place for this question.



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