Low power USB 2.0 subsystem

摘要

USB physical interface subsystems are provided that include a protection circuit including a power supply interface and a plurality of pin interfaces, a pin identifier circuit in communication with the protection circuit for detecting a device coupling to a pin connected to one pin interface of the plurality of pin interfaces, a USB physical interface, and a dual power supply regulator configured to receive power via the power supply interface, to continuously supply a first voltage to the protection circuit, and to provide a second voltage and a third voltage to the pin identifier circuit and the USB physical interface, the second voltage and the third voltage being switched outputs.

主权项

1. A USB physical layer subsystem comprising:
a protection circuit including a power supply interface and a plurality of pin interfaces; a pin identifier circuit in communication with the protection circuit for detecting a device coupling to a pin connected to a pin interface of the plurality of pin interfaces; a USB physical interface; and a dual power supply regulator including a first regulator, a second regulator, and a third regulator, the dual power supply configured to receive power via the power supply interface from an external power supply, to continuously supply a first voltage to the protection circuit, and to selectively provide a second voltage and a third voltage to the pin identifier circuit and the USB physical interface, wherein the second regulator is configured to supply the second voltage to the third regulator.