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USB Suspend state

Lillian XU

Hi All,

I develop the USB CDC firmware(Modify the sample code from ST) using STR912FAW44 and keil MDK.
The Adum 4160 is added to implement the USB isolation. The pull up 1.5K resistor is tied to 3.3V. The firmware works proberly if the USB cable is attached. However, the firmware will hang if the USB cable is detached and power up the device. I use the debug mode and find it always jumps to the suspend state. My schematic for adum4160 is similar to the Figure 7 in the link paper electronix.ru/.../index.php

Can someone have experience with it and how I can get rid of suspend state?

Thank you for your any suggestions.

Best Regards,

Lillian

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