Q: How does FTDI handle USB suspend?
A: USB suspend is controlled by the USB host telling the peripheral device to go to suspend. The FTDI drivers do not force the FTxxx devices to go to suspend. If the USB data bus is idle for >3ms the USB host should put the FTxxx into suspend. To prevent this happening you should ensure there is always data within 3ms. This could be done by sending dummy data.

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