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STM32F4 USB minimum operating voltage

Question asked by grado.joe on Jul 21, 2015
Latest reply on Jul 21, 2015 by grado.joe
I am running the stm32f407 at 1.85V and was wondering if it would be possible to get USB working at this operating voltage. I've pulled up the d+ line to Vbus but cannot get proper enumeration. I believe as long as the differential signal is 100-200mV on the receiving side it should still work. Even with a very short USB cable still no enumeration. Is some kind of level translator or usb signal repeater my only option? Thanks.

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