Port controller device

A port controller device, comprising:

• a first switch configured to receive a supply voltage and configured to be turned on according to a first control signal;
• a second switch coupled between a pull-up resistor and the first switch, wherein the pull-up resistor is configured to be coupled to a port;
• a diode, wherein an anode of the diode is configured to receive the supply voltage;
• a first voltage generator circuit configured to receive the supply voltage from a cathode of the diode, and to divide the supply voltage to generate a second control signal to a control terminal of the second switch;
• a resistor coupled between the control terminal of the second switch and the port;
• a third switch coupled between the first voltage generator circuit and ground;
• and
• a second voltage generator circuit configured to divide the supply voltage to generate a bias signal to a control terminal of the third switch, wherein a withstand voltage of each of the second switch and the third switch is lower than the supply voltage.

A port controller device, comprising:

• a pull-up resistor configured to be coupled to a port, wherein the port is configured to be coupled to a channel configuration pin of an electronic device;
• a switching circuit configured to selectively transmit a supply voltage to the port via the pull-up resistor according to a first control signal, and turn off a signal path between the pull-up resistor and the port according to a second control signal;
• a voltage generator circuit configured to generate the first control signal according to the supply voltage;
• a first transistor coupled between the voltage generator circuit and ground, and configured to be turned on according to an enable signal;
• a resistive circuit coupled between a control terminal of the first transistor and ground, and configured to receive the enable signal;
• and
• a protection circuitry configured to generate the second control signal in response to a voltage from the port when the supply voltage is not powered, in order to limit a current from the port.