CN204333489U - A kind of serial line interface with protective device - Google Patents
A kind of serial line interface with protective device Download PDFInfo
- Publication number
- CN204333489U CN204333489U CN201520001382.XU CN201520001382U CN204333489U CN 204333489 U CN204333489 U CN 204333489U CN 201520001382 U CN201520001382 U CN 201520001382U CN 204333489 U CN204333489 U CN 204333489U
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- diode
- line interface
- protective device
- serial line
- resistance
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Abstract
The utility model relates to a kind of serial line interface with protective device.Comprising RS-232 holds DB9 male, shielded type cable, RS-232 to hold DB9 female, USB interface.The utility model serial line interface is provided with protective circuit; effectively prevent the infringement that Electro-static Driven Comb and surge current cause IC chip and serial line interface; contact Electro-static Driven Comb voltage or the 12KV non-contacting electrostatically release voltage of 6KV can be resisted; also there is overcurrent protection function; prevent the excessive infringement caused of current strength in data wire; the utility model serial line interface has warm connection function, can adapt to the user demand of different serial peripheral.The utility model serial interface data input is provided with USB interface simultaneously and RS-232 holds DB9 female, can carry out arbitrarily U to turn between serial ports and serial communication and switch, person's debugging easy to use, structure is simple, adapt to different application scene, there is huge market value and realistic meaning.
Description
Technical field
The utility model relates to semiconductor circuit, more specifically, relates to a kind of serial line interface with protective device.
Background technology
Along with the application of computer system and the development of singlechip technology, computer and external equipment, information exchange between computer and computer are more and more important, serial communication is the interface that microcomputer application system is commonly used, and has the advantages such as transmission line is few, with low cost, easy to learn.But, due in actual applications, computer system or Single Chip Microcomputer (SCM) system connect various external equipment and carry out serial communication, often because operating voltage is not mated, the signal voltage of such as device under test has exceeded Single Chip Microcomputer (SCM) system voltage allowed band, cause badly damaged to computer system or Single Chip Microcomputer (SCM) system, in addition, in a lot of working condition, need external equipment to support hot plug, and when user is directly with hand or other instrument contact interface rooms, often there is Electro-static Driven Comb phenomenon, especially in digital circuit, Electro-static Driven Comb probably burns out the even whole circuit board of certain chip, very large loss is produced to user, at this moment just need adopt serial line interface to have hot plug protection and static discharge protective function.
Utility model content
The purpose of this utility model is to design and manufactures a kind of serial line interface with protective device.
The technical scheme that the utility model adopts is: a kind of serial line interface with protective device, comprise RS-232 and hold DB9 male, shielded type cable, RS-232 holds DB9 female, USB interface, the other end of the shielded type cable holding DB9 male to be connected with described RS-232 is inserted by shell one STH of protective device, and be connected with the output of the protective circuit plate of shell internal fixtion, also be fixed with U in the shell of described protective device and turn serial port drive circuit board, the output that described U turns serial port drive circuit board connects the input of described protective circuit plate, the other end of the shielded type cable holding DB9 female to be connected with described RS-232 is inserted by the shell opposite side perforate of protective device, connect the input of described protective circuit plate, the other end of the shielded type cable be connected with described USB interface holds the same side perforate of DB9 female phase to insert by the shell of protective device and described RS-232, connect described U and turn serial port drive circuit board input.
Beneficial effect of the present invention is as follows:
(1) the utility model serial line interface is provided with protective circuit; utilize volt-ampere of characteristic diode in protective circuit; effectively prevent the infringement that Electro-static Driven Comb and surge current cause IC chip and serial line interface; contact Electro-static Driven Comb voltage or the 12KV non-contacting electrostatically release voltage of 6KV can be resisted; also there is overcurrent protection function; prevent the excessive infringement caused of current strength in data wire; simultaneously; the utility model serial line interface has warm connection function, can adapt to the user demand of different serial peripheral.
(2) the utility model serial interface data input is provided with USB interface and RS-232 end DB9 female simultaneously, can carry out arbitrarily U to turn between serial ports and serial communication and switch, person's debugging easy to use, structure is simple, adapt to different application scene, there is huge market value and realistic meaning.
Accompanying drawing explanation
Fig. 1 is the serial line interface illustraton of model of band protective device
Fig. 2 is protective circuit plate circuit diagram
Embodiment
Example one:
Realize serial communication between this real case simulation single-chip microcomputer and computer to demonstrate, see accompanying drawing 1 and accompanying drawing 2, illustrate and realize embodiment of the present utility model:
In accompanying drawing: usb 1, RS-232 holds DB9 female 2, U to turn serial port drive circuit board 3, and DB9 male 5 held by protective circuit plate 4, RS-232.
A kind of serial line interface with protective device, comprise RS-232 and hold DB9 male, shielded type cable, RS-232 holds DB9 female, USB interface, the other end of the shielded type cable holding DB9 male to be connected with described RS-232 is inserted by shell one STH of protective device, and be connected with the output of the protective circuit plate of shell internal fixtion, also be fixed with U in the shell of described protective device and turn serial port drive circuit board, the output that described U turns serial port drive circuit board connects the input of described protective circuit plate, the other end of the shielded type cable holding DB9 female to be connected with described RS-232 is inserted by the shell opposite side perforate of protective device, connect the input of described protective circuit plate, the other end of the shielded type cable be connected with described USB interface holds the same side perforate of DB9 female phase to insert by the shell of protective device and described RS-232, connect described U and turn serial port drive circuit board input.RS-232 during actual use in this serial line interface holds DB9 male to insert RS-232 in single-chip minimum system and holds in DB9 female jack, and the RS-232 in this serial line interface holds DB9 female, USB interface is inserted in the jack of the end of the RS-232 after computer cabinet DB9 male, USB board card respectively.The general desktop that embodiment Computer can adopt market conventional, is provided with COM Debug Assistant in computer and U turns serial port drive.
Protective circuit plate TXD and RXD two ends adopt symmetrical structure; protective circuit plate; comprise resistance R1, resistance R2, resistance R3; the dropping equipment that resistance R4, resistance R5, resistance R6 connection in series-parallel are formed; this dropping equipment is utilized to be reduced according to a certain percentage by the high voltage of input; meeting signal voltage in serial communication can not more than the regulation of 5V; and resistance R1 is to prevent the too small electric current that causes of resistance in loop excessive; play the effect of overcurrent protection, protective circuit plate reaches the effect of protection serial line interface and IC chip from above-mentioned two aspects.
Resistance R3 respectively with a TVS diode V1, the general-purpose diode V3 of differential concatenation, and differential concatenation general-purpose diode V2, a TVS diode V4 are connected in parallel, and form the pin TXD of the transmission data of signal output part and serial line interface.Resistance R5 respectively with a TVS diode V5, the general-purpose diode V7 of differential concatenation, and differential concatenation general-purpose diode V6, a TVS diode V8 are connected in parallel, and form the pin RXD of the reception data of signal output part and serial line interface.TVS diode V1, V4, V5, V8 adopt same model diode, and TVS diode V1, V4, V5, V8 adopt model to be SMAJ5.0A diode.General-purpose diode V2, V3, V6, V7 adopt same model diode, and TVS diode V1, V4, V5, V8 adopt model to be IN4007 diode.Utilize the voltage-current characteristic of protection channel diode; the pin RXD voltage range of the pin TXD of the transmission data of output channel corresponding to input channel TXDin and input channel RXDin and serial line interface and reception data is made to control between-5V ~+5V; and described protection channel has the ability of the 800W surge current of anti-8/20us, thus reach the object of protection serial line interface and IC chip.
Above embodiment is only in order to describe technical scheme of the present invention instead of to limit this technical method, the present invention can extend in application other amendment, change, application and embodiment, and therefore think that all such amendments, change, application, embodiment are all in spirit of the present invention and teachings.
Claims (5)
1. the serial line interface with protective device, comprise RS-232 and hold DB9 male, shielded type cable, RS-232 holds DB9 female, USB interface, the other end of the shielded type cable holding DB9 male to be connected with described RS-232 is inserted by shell one STH of protective device, and be connected with the output of the protective circuit plate of shell internal fixtion, also be fixed with U in the shell of described protective device and turn serial port drive circuit board, the output that described U turns serial port drive circuit board connects the input of described protective circuit plate, the other end of the shielded type cable holding DB9 female to be connected with described RS-232 is inserted by the shell opposite side perforate of protective device, connect the input of described protective circuit plate, the other end of the shielded type cable be connected with described USB interface holds the same side perforate of DB9 female phase to insert by the shell of protective device and described RS-232, connect described U and turn serial port drive circuit board input, protective circuit plate TXD and RXD two ends adopt symmetrical structure, protective circuit plate, comprise resistance R1, resistance R2, resistance R3, the dropping equipment that resistance R4, resistance R5, resistance R6 connection in series-parallel are formed, this dropping equipment is utilized to be reduced according to a certain percentage by the high voltage of input, meeting signal voltage in serial communication can not more than the regulation of 5V, and resistance R1 is to prevent the too small electric current that causes of resistance in loop excessive, playing the effect of overcurrent protection, resistance R3 respectively with a TVS diode V1, the general-purpose diode V3 of differential concatenation, and differential concatenation general-purpose diode V2, a TVS diode V4 are connected in parallel, and form the pin TXD of the transmission data of signal output part and serial line interface, resistance R5 respectively with a TVS diode V5, the general-purpose diode V7 of differential concatenation, and differential concatenation general-purpose diode V6, a TVS diode V8 are connected in parallel, and form the pin RXD of the reception data of signal output part and serial line interface.
2. a kind of serial line interface with protective device according to claim 1, is characterized in that TVS diode V1, V4, V5, V8 employing same model diode.
3. a kind of serial line interface with protective device according to claim 1, it is characterized in that TVS diode V1, V4, V5, V8 adopt model be SMAJ5.0A diode.
4. a kind of serial line interface with protective device according to claim 1, is characterized in that general-purpose diode V2, V3, V6, V7 adopt same model diode.
5. a kind of serial line interface with protective device according to claim 1, it is characterized in that TVS diode V1, V4, V5, V8 adopt model be IN4007 diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520001382.XU CN204333489U (en) | 2015-01-04 | 2015-01-04 | A kind of serial line interface with protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520001382.XU CN204333489U (en) | 2015-01-04 | 2015-01-04 | A kind of serial line interface with protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204333489U true CN204333489U (en) | 2015-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520001382.XU Expired - Fee Related CN204333489U (en) | 2015-01-04 | 2015-01-04 | A kind of serial line interface with protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204333489U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107704415A (en) * | 2017-11-06 | 2018-02-16 | 郑州华力信息技术有限公司 | Simple RS232 multifunctional serial port expanding units |
| CN108628790A (en) * | 2017-03-23 | 2018-10-09 | 慧与发展有限责任合伙企业 | Non volatile memory drives |
-
2015
- 2015-01-04 CN CN201520001382.XU patent/CN204333489U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108628790A (en) * | 2017-03-23 | 2018-10-09 | 慧与发展有限责任合伙企业 | Non volatile memory drives |
| CN107704415A (en) * | 2017-11-06 | 2018-02-16 | 郑州华力信息技术有限公司 | Simple RS232 multifunctional serial port expanding units |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150513 Termination date: 20160104 |