Hi Experts,
My customer met a quite strange phenomenon when using TPD2S703-Q1. When they remove Vpwr and pull up EN pin, theoretically the device should shut down and the switch between VD+ and D+ should be turned off. But actually, the switch between VD+ and D+ is still connected, and the voltage at Vref pin is 2.6V.
Further test they found Vref=2.6V occurs only when D+ is pulled up to 3.3V, which is the start of full-speed device connection. So I suppose that there may be some current from D+ that charges the capacitor at Vref. I have compared customer's schematic with EVM but find nothing special. Could you please help to analyze why the switch between VD+ and D+ is still closed and Vref is 2.6V when the device is disabled? Thank you.
BR,
Arie
