Hello Rob, Section 42.2.2.4 Self-Powered Devices of document SLAU208 mentions that there is ab it USBDETEN that detects VBUS voltage. This bit can be disabled in the USB_init function. Also Section 4.2 Selecting a Power Configuration (SLAA457) says that switching between VBUS and self powered is possible. Just to clarify, the system you have has an MSP430F5659 communicating with another chip inside over USB. Correct? I want to make sure the tests I run are similar to your setup. I'm still running some tests to make sure that the system is working as expected with that modification. Best regards, Erick
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