I am using the TUSB319EVM module and have a question about the Vbus discharge circuit. I am specifically looking at Figure 1 on the TUSB319EVM user manual which is the same as Figure 2 on the TUBS319-Q1 datasheet.
Based on the figure and the datasheet ID goes LOW when a cable is attached. When ID goes low the p-channel FET turns on an the VBUS is discharged through the 1K resistor. When the cable is unplugged ID goes HIGH. When ID goes HIGH the p-channel FET turn off.
I would have though this should be the opposite? Should the be an n-channel FET instead of a p-channel? Is the goal of the discharge circuit to discharge the voltage on VBus when a device is attached or when the device is unplugged?
Thank you.
