We have selected the MSP430F5508 for use in our design
In reviewing the spec, Section 5.3 talks about voltage rails and what is needed to run the part. It appears that USB needs a minimum of 1.5MHz to work, which is available with input voltages down to 1.8V, so from reading all of this it appears that a Vcc = 3.3V should be sufficient to run the part, including the USB interface.
Then I stumbled upon Section 5.44, which if I understand this right implies that the USB system needs to be powered by something greater than 3.75V. So at this point I am not sure if we can run with a main rail of 3.3V and have the USB operational. We do not have any voltage rail greater than 3.3V in our system today.
Maybe there is a different configuration for running USB with only low voltage rails present? Please advise.
Thank you so much