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USB disconnect/reconnect | Cypress Semiconductor

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USB disconnect/reconnect

Last Updated: February 05, 2014

How can a device detect a USB disconnect/reconnect ?


In order to detect a device disconnect the device will have to be self powered.The method used to detect if a device is connected to the bus is to monitor the VBUS signal. Connect the VBUS to an external I/o pin configured as an input.Make sure you have pull down resistors (of high resistance to maintain the suspend current of 100 mA) on VBUS.  Please refer to the appnote "

Monitoring the EZ-USB FX2LP™ VBUS" for more information.


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