We have an embedded design that uses the MSP430F5659 and communicates internally over USB. The device is battery operated, and the battery range is from 3V-4.2V. We need USB communication over the entire battery voltage range. The MSP430 detects voltage on the VBUS input as a first level of detection if a USB host is present. This detection is looking for voltage greater than 3.75V, which is not present in our system with lower battery voltages. Is there a way to bypass this detection and to have the MSP430 assume that USB host is always present to move on to the next stage of enumeration, even when only voltages below 3.75V are present?
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