Dynamic VCONN swapping in dual-powered type-C cable applications
First Claim
1. A semiconductor device for a Universal Serial Bus (USB) Type-C cable, the semiconductor device comprising:
- a first terminal to couple to a first VCONN line from a first end of the USB Type-C cable;
a second terminal to couple to a second VCONN line from a second end of the USB Type-C cable;
a charge pump; and
a switch circuit coupled to the first terminal and the second terminal, the switch circuit comprising;
a first drain-extended n-type field effect transistor (DENFET) coupled between the first terminal and an internal power supply of the semiconductor device;
a first pump switch coupled between the charge pump and a gate of the first DENFET;
a second DENFET coupled between the second terminal and the internal power supply; and
a second pump switch coupled between the charge pump and a gate of the second DENFET.
3 Assignments
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Accused Products
Abstract
A semiconductor device for a USB Type-C cable includes a first terminal to couple to a first VCONN line from a first end of the cable, a second terminal to couple to a second VCONN line from the second end of the cable, a charge pump, and a switch circuit coupled to the first terminal and the second terminal. The switch circuit includes a first drain-extended n-type field effect transistor (DENFET) coupled between the first terminal and an internal power supply of the semiconductor device; a first pump switch coupled between the charge pump and a gate of the first DENFET; a second DENFET coupled between the second terminal and the internal power supply; and a second pump switch coupled between the charge pump and a gate of the second DENFET.
26 Citations
20 Claims
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1. A semiconductor device for a Universal Serial Bus (USB) Type-C cable, the semiconductor device comprising:
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a first terminal to couple to a first VCONN line from a first end of the USB Type-C cable; a second terminal to couple to a second VCONN line from a second end of the USB Type-C cable; a charge pump; and a switch circuit coupled to the first terminal and the second terminal, the switch circuit comprising; a first drain-extended n-type field effect transistor (DENFET) coupled between the first terminal and an internal power supply of the semiconductor device; a first pump switch coupled between the charge pump and a gate of the first DENFET; a second DENFET coupled between the second terminal and the internal power supply; and a second pump switch coupled between the charge pump and a gate of the second DENFET. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
operating a semiconductor device for a Universal Serial Bus (USB) Type-C cable, the semiconductor device comprising a first terminal, a first drain-extended n-type field effect transistor (DENFET) coupled between the first terminal and an internal power supply, a first pump switch coupled to a gate of the first DENFET, and control logic coupled to the first pump switch, wherein operating the semiconductor device comprises; powering on the first DENFET from a voltage, received at the first terminal, falling across a resistor that is coupled between the first terminal and a gate of the first DENFET; powering on an internal power supply of the semiconductor device in response to the voltage being passed through the first DENFET to the internal power supply; powering up the semiconductor device in response to the powering on the internal power supply; and operating the control logic of the semiconductor device to fully power on the first DENFET, and thus enter an active mode of the semiconductor device, in response to the powering up of the semiconductor device. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system comprising:
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a first USB Type-C plug at a first end of a USB Type-C cable; a first VCONN line coupled to the first USB Type-C plug; and a first integrated circuit (IC) controller comprising; a first terminal coupled to the first VCONN line; a first drain-extended n-type field effect transistor (DENFET) coupled between the first terminal and a first internal power supply of the first IC controller; a first pump switch coupled between a first charge pump and a gate of the first DENFET; and first hardware logic coupled to the first pump switch, to the first charge pump, and to the first internal power supply, the first hardware logic to; detect a voltage coming from the first terminal; and turn on the first pump switch in response to detection of the voltage from the first terminal, to pass a pump voltage from the first charge pump to a gate of the first DENFET. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification