CN104485980A - Long-distance transmission system of SPI (Serial Peripheral Interface) bus data - Google Patents
Long-distance transmission system of SPI (Serial Peripheral Interface) bus data Download PDFInfo
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- CN104485980A CN104485980A CN201410762276.3A CN201410762276A CN104485980A CN 104485980 A CN104485980 A CN 104485980A CN 201410762276 A CN201410762276 A CN 201410762276A CN 104485980 A CN104485980 A CN 104485980A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 57
- 230000002093 peripheral effect Effects 0.000 title abstract description 5
- 238000004891 communication Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- VOKGETOTKWMDKG-UHFFFAOYSA-N 1,3-dioxoisoindole-5-sulfonic acid Chemical compound OS(=O)(=O)C1=CC=C2C(=O)NC(=O)C2=C1 VOKGETOTKWMDKG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The invention relates to a long-distance transmission system of SPI (Serial Peripheral Interface) bus data. The long-distance transmission system comprises a transmitter, a twisted pair transmission cable and a receiver, wherein the transmitter is connected with the receiver through the twisted pair transmission cable; the transmitter comprises four RS-422/RS-485 transmitter chips of MAX3045; the receiver comprises four RS-422/RS-485 receiver chips of MAX3095; the twisted pair transmission cable is formed by connection of unshielded twisted pairs of CAT 5 or CAT 5E which meet the TIA/EIA-568B standard. The long-distance transmission system is simple in structure; the reliable transmission distance of the SPI bus data can be extended to be 1200m; the application range of an SPI bus device is greatly expanded.
Description
Technical field
The present invention relates to a kind of signal transmission system, particularly one and relate to SPI data distance transmission system.
Background technology
SPI (Serial Peripheral Interface, Serial Peripheral Interface (SPI)) bus is a kind of synchronous serial peripheral interface protocol that motorola inc proposes, and it can make MCU and various ancillary equipment carry out in a serial fashion communicating with exchange message.The interface line taken due to this bus is few, and speed is fast, and can receive and dispatch, communication efficiency is high simultaneously, supports that the device of this bus is numerous, comprises E
2pROM, A/D, D/A, real-time clock and LED, lcd driver part etc.
Spi bus is a kind of widely used short distance distant serial synchronous telecommunications agreement, there is communication protocol simple, transmission speed is fast, the plurality of advantages such as communication efficiency is high, but the shortcoming that its transmission range is nearer, limits the scope of its use, if keeping suitable transmission rate, and the near shortcoming of spi bus transmission range can be solved, greatly can expand the scope of spi bus application.
SPI data bus transmission apart near main cause be spi bus adopt be single-ended imbalance transmission data transfer mode.
In signals transmission, such as magnetic field, vibration, temperature etc. all can cause interference to signal, the degree be interfered in transmitting procedure and holding wire quality and transmission range have much relations, and signal frequency is higher, Signal transmissions line mass is poorer, transmission range is longer, and the degree be interfered is larger.In single-ended uneven transmitting procedure, cannot eliminate or weaken for the interference be incorporated in holding wire, serious words can cause the mistake of transfer of data.In addition, in single-ended uneven transmission means, need a public ground wire as a reference point, ground wire is also the loop line of signal code simultaneously, there is signal code, when there is alternating current potential difference between two systems be connected to by this transmission line, this alternating current potential difference, by directly channeling in signal, causes noise jamming.The transmission range of spi bus data is made only to be confined to the short range data transmission of plate, card rank for these reasons.
Summary of the invention
The technical problem to be solved in the present invention is: for SPI data bus transmission apart from short shortcoming, and provide a kind of spi bus data distance transmission system, this system can extend SPI data transmission distance.
The technical scheme solved the problems of the technologies described above is: a kind of spi bus data distance transmission system, comprise transmitter, twisted-pair transmission cable and receiver, described transmitter is connected with receiver by twisted-pair transmission cable, described transmitter is made up of MAX3045 tetra-road RS-422/RS-485 receiving and sending device chip, and described receiver is made up of MAX3095 tetra-road RS-422/RS-485 receiver chip.
Further technical scheme of the present invention is: described twisted-pair transmission cable is that the unshielded twisted pair of the CAT 5 or CAT 5E grade meeting TIA/EIA-568B standard connects.
Owing to adopting technique scheme, the spi bus data distance transmission system of the present invention, has following beneficial effect:
The present invention includes transmitter, twisted-pair transmission cable and receiver, described transmitter is connected with receiver by twisted-pair transmission cable, the present invention realizes both-end balance transmission by twisted-pair transmission cable, because piece line of two in twisted-pair feeder trend, material are consistent, therefore earth impedance is consistent.And the signal of both-end balance transmission is that amplitude is equal, the signal that phase place is contrary, in both-end balance transmission passage, the interference that the external electromagnetic interference received produces in wire is consistent, concerning signal receiving end, this is a kind of common mode disturbances, this common mode disturbances can be eliminated with suitable circuit or be suppressed greatly, improve the quality of Signal transmissions to a great extent, achieve the long-distance transmissions of SPI data, invention structure is simple, spi bus reliable data transmission distance can be extended to 1200 meters, greatly expand the scope using spi bus device to use.
Below, in conjunction with Figure of description and specific embodiment, the technical characteristic to the spi bus data distance transmission system of the present invention is further described.
Accompanying drawing explanation
Fig. 1: the circuit diagram of the spi bus data distance transmission system of the present invention.
Fig. 2: the application circuit of the spi bus data distance transmission system of the present invention.
In above-mentioned accompanying drawing, each label declaration is as follows:
1-transmitter, 2-twisted-pair transmission cable, 3-receiver, 4-SPI main frame, 5-SPI is from machine.
Embodiment
A kind of spi bus data distance transmission system, comprise transmitter, twisted-pair transmission cable and receiver, described transmitter is connected with receiver by twisted-pair transmission cable, described transmitter adopts MAX3045 tetra-road RS-422/RS-485 receiving and sending device chip to form, and described receiver adopts MAX3095 tetra-road RS-422/RS-485 receiver chip to form.Described twisted-pair transmission cable is that the unshielded twisted pair of the CAT 5 or CAT 5E grade meeting TIA/EIA-568B standard connects.
Transmitter is connected by twisted-pair transmission cable with receiver, connects the SCLK(clock needed for SPI data/address bus at transmitting terminal), MOSI(main frame sends), the choosing of SS(sheet) etc. three signals, receiving terminal exports corresponding signal.
During use, see Fig. 2, the data of spi bus are sent at transmitting terminal SPI main frame (being generally single-chip microcomputer), pass through transmitter, by the single-ended unbalanced incoming level of SPI data/address bus, be transformed to both-end Differential Output form, by the transmission of twisted-pair cable (when non-relay, reliable data transmission distance reaches 1200 meters) to receiving terminal, receiving terminal by balance transmission mode, be converted to the single-ended unbalanced mode that SPI data/address bus accepts, give SPI slave devices, realize the long-distance transmissions of SPI data.
Claims (2)
1. a spi bus data distance transmission system, it is characterized in that: comprise transmitter, twisted-pair transmission cable and receiver, described transmitter is connected with receiver by twisted-pair transmission cable, described transmitter is made up of MAX3045 tetra-road RS-422/RS-485 receiving and sending device chip, and described receiver is made up of MAX3095 tetra-road RS-422/RS-485 receiver chip.
2. want the spi bus data distance transmission system described in 1 according to right, it is characterized in that: described twisted-pair transmission cable is that the unshielded twisted pair of the CAT 5 or CAT 5E grade meeting TIA/EIA-568B standard connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410762276.3A CN104485980A (en) | 2014-12-12 | 2014-12-12 | Long-distance transmission system of SPI (Serial Peripheral Interface) bus data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410762276.3A CN104485980A (en) | 2014-12-12 | 2014-12-12 | Long-distance transmission system of SPI (Serial Peripheral Interface) bus data |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104485980A true CN104485980A (en) | 2015-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410762276.3A Pending CN104485980A (en) | 2014-12-12 | 2014-12-12 | Long-distance transmission system of SPI (Serial Peripheral Interface) bus data |
Country Status (1)
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| CN (1) | CN104485980A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201060487Y (en) * | 2007-05-29 | 2008-05-14 | 山东大学 | A high-speed configurable extended SPI bus |
| CN204349980U (en) * | 2014-12-12 | 2015-05-20 | 柳州铁道职业技术学院 | Spi bus data distance transmission system |
-
2014
- 2014-12-12 CN CN201410762276.3A patent/CN104485980A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201060487Y (en) * | 2007-05-29 | 2008-05-14 | 山东大学 | A high-speed configurable extended SPI bus |
| CN204349980U (en) * | 2014-12-12 | 2015-05-20 | 柳州铁道职业技术学院 | Spi bus data distance transmission system |
Non-Patent Citations (1)
| Title |
|---|
| 梁德坚，刘玉琼: "SPI总线数据远距离传输实现", 《电子测试》 * |
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Application publication date: 20150401 |