The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 2014
Filed:
Nov. 24, 2011
Jing Yu, Shanghai, CN;
Shaobin Huang, Shanghai, CN;
Kui Du, Shanghai, CN;
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 (R) and a first switch (S) 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 (R) and a second switch (S) 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 (R) and a third switch (S) 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 (R) and a fourth switch (S) 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 (R) and a fifth switch (S) 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.