Disconnect is the automated process of turning off power to the port. When the port is unloaded or at least falls below minimum load, it is required to turn off power to the port and restart detection. In DC disconnect, the voltage across the sense resistors is measured. When enabled, the DC disconnect function monitors the sense resistor voltage of a powered port to verify the port is drawing at least the minimum current to remain active. The T_DIS timer counts up whenever the port current is below the disconnect threshold (6.5-mA typical). If a timeout occurs, the port is shut down and the corresponding disconnect bit in the Fault Event Register is set. In the case of a PD implementing MPS (maintain Power Signature) current pulsing, the T_DIS counter is reset each time the current goes continuously higher than the disconnect threshold for at least 3 ms.

The T_DIS duration is set by the T_MPDO Bits of the Timing Configuration register (0x16).