USB (Universal Serial Bus) equipment and detection method thereof

A technology of equipment and resistance, which is applied in the field of USB equipment and its detection, can solve the problem of occupying pin resources and achieve the effect of saving pin resources
CN102479133AActive Publication Date: 2012-05-30ACTIONS ZHUHAI TECH CO
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
ACTIONS ZHUHAI TECH CO
Publication Date
2012-05-30

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Abstract

The invention relates to the field of communication equipment and discloses USB (Universal Serial Bus) equipment and a detection method thereof. The USB equipment can be detected to be host equipment or slave equipment without an ID (Identification) base pin, and thus, the base pin resources of the USB equipment are saved. The USB equipment disclosed by the invention comprises a series branch (1) consisting of a first pull-up resistor and a first switch, a series branch (2) consisting of a second pull-up resistor and a second switch, a series branch (3) consisting of a third pull-up resistor and a third switch, a series branch (4) consisting of a fourth pull-down resistor and a fourth switch, a series branch (5) consisting of a fifth pull-down resistor and a fifth switch, wherein one end of the series branch (1) is connected with a VCC (Virtual Channel Connection), the other end of the series branch (1) is connected with a D+ data line or a D- data line, one end of the series branch (2) is connected with the VCC, the other end of the series branch (2) is connected with the D+ data line, one end of the series branch (3) is connected with the VCC, the other end of the series branch (3) is connected with the D- data line, one end of the series branch (4) is grounded, the other end of the series branch (4) is connected with the D+ data line, one end of the series branch (5) is grounded, the other end of the series branch (5) is connected with the D- data line.
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Description

technical field

[0001] The invention relates to the field of communication equipment, in particular to a USB equipment and a detection method thereof. Background technique

[0002] A USB device (Universal Serial Bus, universal serial bus) conforming to the USB2.0 specification is generally a DRD (Dual Role Device, dual-role device) device, which can be used as a master device or as a slave device. Such as figure 1 As shown, it is a schematic structural diagram of a USB device conforming to the USB2.0 specification. The connection pins of the USB device include: VBUS pins, ID pins, GND pins, and D+ / D- pins. The internal structure of the USB device includes: The data transceiver circuit, its output is connected to the D+ / D- pin through the D+, D- data lines, the VBUS drive control module is connected to the VBUS pin through the VBUS data line, the D+ data line is grounded through the pull-down resistor R4 and the switch S4, and the D - The data line is grounded through the p...

Claims

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