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USB switch which allows primary USB connection in response to USB signaling

a usb switch and primary usb technology, applied in the field of usb switches, can solve the problems of not being able to meet the specification, portable devices are often unable to enumerate with the usb host in order to charge, and systems are not suitable for enumerating power

Active Publication Date: 2012-12-06
SMSC HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent describes a system and method for enumerating a USB device using low power. The system detects when the USB device is connected to a host USB device and uses the power provided by the host USB device to perform the enumeration. The method allows for low power consumption and can be used in portable devices with battery charging circuitry. The system includes a switch that controls the coupling of the USB device to the host USB device and the device logic of the USB device may be powered using the host USB device until it is ready to perform additional tasks. The method can be used in various embodiments and does not require any modifications to the device logic."

Problems solved by technology

However, when the battery of the portable device is depleted, e.g., when the battery is “dead”, or when the device is not turned on or booted up, the portable device is often unable to enumerate with the USB host in order to charge.
More specifically, if the portable devices do not have enough power to engage in enumeration, the portable devices may not be allowed to charge at enumerated power.
However, these systems do not comply with the specification and may be subject to having their power source removed, e.g., by the host device.

Method used

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  • USB switch which allows primary USB connection in response to USB signaling
  • USB switch which allows primary USB connection in response to USB signaling
  • USB switch which allows primary USB connection in response to USB signaling

Examples

Experimental program
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Embodiment Construction

Incorporation by Reference

[0020]U.S. Pat. No. 7,624,202 titled “System and Method for Enumerating a USB Device Using Low Power”, whose inventors are Morgan H. Monks and Mark R. Bohm, and which issued on Nov. 24, 2009, is hereby incorporated by reference in its entirety as though fully and completely set forth herein.

Terms

[0021]The following is a glossary of terms used in the present application:

[0022]Memory Medium—Any of various types of memory devices or storage devices. The term “memory medium” is intended to include an installation medium, e.g., a CD-ROM, floppy disks 104, or tape device; a computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; or a non-volatile memory such as a magnetic media, e.g., a hard drive, or optical storage. The memory medium may comprise other types of memory as well, or combinations thereof. In addition, the memory medium may be located in a first computer in which the programs are executed, or may be loc...

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PUM

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Abstract

System and method controlling connectivity within a device. A device may be coupled to a host device. In response to the coupling, low power logic (e.g., an embedded device) of the device may be coupled to the host device. The low power logic may perform enumeration with the host device using only power provided by the host device. The low power logic may also charge a battery of the device using power provided by the host device. Device circuitry of the device may provide a signal for coupling to the host device. In response, the device circuitry may be coupled to the host device and may perform device enumeration with the host device.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the field of Universal Serial Bus (USB) devices, and more particularly to a USB switch which allows a primary USB connection in response to USB signaling.DESCRIPTION OF THE RELATED ART[0002]In recent years, there has been a proliferation of portable USB devices that utilize power provided by a battery. For example, many people own or purchase various portable devices such as cell phones, music players, video players, and laptops, among other devices.[0003]In using such portable devices, users often require that they be easily recharged, e.g., using various electrical outlets, e.g., in a house or car. Most users that own or purchase these devices also own host device(s), e.g., a computer, which supports USB communication / devices. In such cases, it is often convenient to charge the portable devices using power supplied by the host device, e.g., using the USB connection.[0004]However, when the battery of the portable device i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F13/38
CPCG06F13/4291
Inventor MONKS, MORGAN H.HAGLAN, DAVID E.
Owner SMSC HLDG