Apparatus and method to support USB enumeration of a bus powered handheld device
US7984318B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2009 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | May 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/266
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A handheld communication device to communicate with a remote universal serial bus (USB) host controller via an integrated power and data port is provided. The device includes a microprocessor communicating with a power management integrated circuit (IC), wherein said microprocessor requires greater than 100 mA to be enumerated with the USB host controller. The device includes a USB microcontroller communicating with the USB host controller via a multiplexer and integrated power and data port, wherein the USB microcontroller requires less than 100 mA to be enumerated with the USB host controller, and wherein if a current available from the rechargeable battery is below a specified threshold required to power up the microprocessor, then the USB microcontroller performs USB enumeration with the USB host controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.