USB device and detection method thereof
US8793425B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 2011 |
| Grant date | Jul 29, 2014 |
| Priority date | — |
| Expiry date | Nov 24, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2213/0042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A USB device and a detection method therefor. It can be detected whether the USB device is a master device or a slave device without the use of an ID pin, thereby saving the pin resources of the USB device. The USB device comprises: a series branch formed by a first pull-up resistor (R1) and a first switch (S1) and having one end connected to VCC and the other end connected to a D+ or D− data line; a series branch formed by a second pull-up resistor (R2) and a second switch (S2) and having one end connected to the VCC and the other end connected to the D+ data line; a series branch formed by a third pull-up resistor (R3) and a third switch (S3) and having one end connected to VCC and the other end connected to the D− data line; a series branch formed by a fourth pull-up resistor (R4) and a fourth switch (S4) and having one end being grounded and the other end connected to the D+ data line; and a series branch formed by a fifth pull-up resistor (R5) and a fifth switch (S5) and having one end being grounded and the other end connected to the D− data line. The USB device belongs to the field of communication devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.