CN103473203A - USB (universal serial bus) interface circuit with electrostatic protection - Google Patents
USB (universal serial bus) interface circuit with electrostatic protection Download PDFInfo
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- CN103473203A CN103473203A CN2013104162833A CN201310416283A CN103473203A CN 103473203 A CN103473203 A CN 103473203A CN 2013104162833 A CN2013104162833 A CN 2013104162833A CN 201310416283 A CN201310416283 A CN 201310416283A CN 103473203 A CN103473203 A CN 103473203A
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- signal line
- electrostatic protection
- usb
- interface circuit
- protective unit
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Abstract
The invention relates to the technical field of electronics, in particular to a USB interface circuit. The USB interface circuit with electrostatic protection is characterized by comprising a first signal line, a second signal line and a ground line. Electrostatic protection units are respectively arranged between the first signal line and the ground line and between the second signal line and the ground line, each electrostatic protection unit comprises two conductors, each conductor is provided with a tip, and tips of the two conductors are relatively arranged and are provided with one clearance at intervals. Compared with conventional USB electrostatic protection, the USB interface circuit is simple in wiring and low in cost, and signal quality can be guaranteed without consideration of signal attenuation on difference paths.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of usb circuit.
Background technology
Interaction between substances is as friction, contact, induction, the material that conducts and cause obtains or loses electronics, lose electrobalance and electrically charged, the accumulation of electric charge just makes static on the material surface band, when charge accumulated arrives enough intensity, electric charge may be released, cause its material on every side breakdown, thereby obtain new electrobalance, the quick neutralization of this electrostatic charge is called static discharge (Electro Static Discharge, ESD), because its speed is very fast, and the resistance when electric discharge is generally very little, tend to cause transient high-current, circuit is caused damage.For some ESDS(Electrostatic Discharge Sensitives), can make it lose due normal performance itself, even completely lose normal function, thereby the ESD protection is very necessary.
For common interfaces such as USB, during the user uses, hot plug is carried out in regular meeting, chip on plate is very easy to be subject to electrostatic influence, in actual use simultaneously, the user is easy to just can catch and contact the minor metal shell, makes static be easy to directly be transferred in Circuits System, destroys the environment for use of Circuits System, serious static can directly be broken the device in Circuits System, causes electronic product to damage.
Summary of the invention
The object of the invention is to, a kind of usb circuit with electrostatic protection is provided, solve above technical matters.
Technical matters solved by the invention can realize by the following technical solutions:
A kind of usb circuit with electrostatic protection; wherein; comprise first signal line, secondary signal line, ground wire; between described first signal line and described ground wire, between described secondary signal line and described ground wire, be respectively equipped with static protective unit; described static protective unit comprises two conductors; each described conductor is provided with tip, and the tip of two described conductors is oppositely arranged and gap is set at interval one.
The present invention is by arranging static protective unit, static protective unit comprises two conductors, the tip of two described conductors is oppositely arranged and gap is set at interval one, utilize the point discharge effect principle, when some electrostatic potentials enter into printed circuit board from connection terminal, can fall electrostatic leakage by tip, realize the purpose of electrostatic defending.
Preferably, make described conductor by the technique of revealing copper on printed circuit board.
Preferably, also be connected a described static protective unit between described first signal line and described secondary signal line.
Preferably, the span in described setting gap is 4mil-4.4mil.
Preferably, described setting gap is 4.2mil.
Preferably, described first signal line is the first differential data line; Described secondary signal line is the second differential data line.
Beneficial effect: owing to adopting above technical scheme, the present invention, with respect to traditional USB antistatic protection, connects up simple, with low cost, need not consider the signal attenuation above the differential lines path, can guarantee signal quality.
The accompanying drawing explanation
The part connection diagram that Fig. 1 is a kind of specific embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belong to the scope of protection of the invention.
It should be noted that, in the situation that do not conflict, embodiment and the feature in embodiment in the present invention can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
A kind of usb circuit with electrostatic protection; comprise first signal line, secondary signal line, ground wire; between first signal line and ground wire, between secondary signal line and ground wire, be respectively equipped with static protective unit; static protective unit comprises two conductors; each conductor is provided with tip, and the tip of two conductors is oppositely arranged and gap is set at interval one.
The present invention is by arranging static protective unit, static protective unit comprises two conductors, the tip of two conductors is oppositely arranged and gap is set at interval one, utilize the point discharge effect principle, when some electrostatic potentials enter into printed circuit board from connection terminal, can fall electrostatic leakage by tip, realize the purpose of electrostatic defending.
A kind of specific embodiment, with reference to Fig. 1, comprise a USB interface chip (J1), the USB interface chip is provided with the first differential data output terminal (D+), the second differential data output terminal (D-), earth terminal (GND), the first data output end is drawn the first differential data line, and the second data output end is drawn the second differential data line; Earth terminal is communicated with the ground of printed circuit board by ground wire; Be provided with the first static protective unit (ESD1) between the first differential data line and ground wire; Be provided with the second static protective unit (ESD2) between the second differential data line and earth lead.
Further, also be provided with the 3rd static protective unit (ESD3) between the first differential data output terminal (D+), the second differential data output terminal (D-).
Make above-mentioned conductor and tip by the technique of revealing copper on printed circuit board.As passed through in the design process of printed circuit board (pcb), the place that can reveal copper to needs is as fill area (playce-> Fill), or polygon paving copper (place-> Polygon Panel) this fill area or paving copper are made as to Top Solder (end face helps layer), or Bottom Solder (bottom surface helps layer).
Setting gap between the static protective unit tip plays a part crucial to electrostatic discharged effect, if it is bigger than normal or less than normal to set gap, static all can not be released on ground wire effectively, does not reach desirable static eradicating efficacy.In specific embodiments of the invention, when PCB layout, the span in above-mentioned setting gap is 4mil-4.4mil (0.1016mm-0.1118mm).Preferably, setting gap is 4.2mil (0.1066mm).
The USB interface chip also comprises a power supply end (VCC), and power supply end connects supply voltage (+5V).Earth terminal also comprises GND1, GND2, GND3, GND4.
The setting of static protective unit of the present invention, do not need to introduce electrostatic protection device, but can play the effect of electrostatic prevention, and realize simple and convenient, and with low cost.Due to the static protective unit of earth wire being arranged on first signal line, secondary signal line simultaneously, first signal line and secondary signal line static protective unit are each other also arranged, guarantee like this no matter where is it static can be released away by static protective unit.
The present invention can be used in current all electronic products with USB interface; this invention is with respect to traditional anti-static method; almost without any need for Material Cost can carry out electrostatic protection to the USB device mouth; and can not carry out any interference to the electric signal of USB self; so the guard method usable zero cost in this invention guarantees that USB is normally used, and has the function of electrostatic defending simultaneously.
The foregoing is only preferred embodiment of the present invention; not thereby limit embodiments of the present invention and protection domain; to those skilled in the art; should recognize that being equal to that all utilizations instructions of the present invention and diagramatic content done replace and the resulting scheme of apparent variation, all should be included in protection scope of the present invention.
Claims (6)
1. the usb circuit with electrostatic protection; it is characterized in that; comprise first signal line, secondary signal line, ground wire; between described first signal line and described ground wire, between described secondary signal line and described ground wire, be respectively equipped with a static protective unit; described static protective unit comprises two conductors; each described conductor is provided with tip, and the tip of two described conductors is oppositely arranged and gap is set at interval one.
2. a kind of usb circuit with electrostatic protection according to claim 1, is characterized in that, by the technique of revealing copper on printed circuit board, makes described conductor.
3. a kind of usb circuit with electrostatic protection according to claim 1, is characterized in that, between described first signal line and described secondary signal line, also is connected a described static protective unit.
4. a kind of usb circuit with electrostatic protection according to claim 1, is characterized in that, the span in described setting gap is 4mil-4.4mil.
5. a kind of usb circuit with electrostatic protection according to claim 4, is characterized in that, described setting gap is 4.2mil.
6. a kind of usb circuit with electrostatic protection according to claim 1, is characterized in that, described first signal line is the first differential data line; Described secondary signal line is the second differential data line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104162833A CN103473203A (en) | 2013-09-12 | 2013-09-12 | USB (universal serial bus) interface circuit with electrostatic protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104162833A CN103473203A (en) | 2013-09-12 | 2013-09-12 | USB (universal serial bus) interface circuit with electrostatic protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103473203A true CN103473203A (en) | 2013-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013104162833A Pending CN103473203A (en) | 2013-09-12 | 2013-09-12 | USB (universal serial bus) interface circuit with electrostatic protection |
Country Status (1)
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| CN (1) | CN103473203A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104598857A (en) * | 2015-01-27 | 2015-05-06 | 周玉萍 | Anti-static card reader |
| CN108206432A (en) * | 2016-12-20 | 2018-06-26 | 北京小米移动软件有限公司 | Data-interface with ESD structures |
| CN109004633A (en) * | 2018-07-25 | 2018-12-14 | 合肥联宝信息技术有限公司 | A kind of protective device of lightning surge |
| CN110011132A (en) * | 2019-04-09 | 2019-07-12 | 晶晨半导体(上海)股份有限公司 | A kind of port processing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104598857A (en) * | 2015-01-27 | 2015-05-06 | 周玉萍 | Anti-static card reader |
| CN108206432A (en) * | 2016-12-20 | 2018-06-26 | 北京小米移动软件有限公司 | Data-interface with ESD structures |
| CN109004633A (en) * | 2018-07-25 | 2018-12-14 | 合肥联宝信息技术有限公司 | A kind of protective device of lightning surge |
| CN110011132A (en) * | 2019-04-09 | 2019-07-12 | 晶晨半导体(上海)股份有限公司 | A kind of port processing method |
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Application publication date: 20131225 |