CN207319794U - A kind of I for strengthening antijamming capability2C buses - Google Patents
A kind of I for strengthening antijamming capability2C buses Download PDFInfo
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- CN207319794U CN207319794U CN201721219107.0U CN201721219107U CN207319794U CN 207319794 U CN207319794 U CN 207319794U CN 201721219107 U CN201721219107 U CN 201721219107U CN 207319794 U CN207319794 U CN 207319794U
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- ground wire
- buses
- communication cable
- antijamming capability
- slave
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Abstract
The utility model discloses a kind of I for strengthening antijamming capability2C buses, are related to field of communication technology, it is intended to solve I under bad electromagnetic environment in the prior art2The problem of long distance transmission poor reliability of C bus signals.The I of the enhancing antijamming capability2C buses, including：The communication cable being connected between host and slave；The communication cable includes：Serial data line, serial time clock line, the first ground wire, the second ground wire；First ground wire and second ground wire are altogether；The serial data line mutually twists into the first twisted-pair feeder by insulating layer cladding respectively with first ground wire；The serial time clock line mutually twists into the second twisted-pair feeder by insulating layer cladding respectively with second ground wire.
Description
Technical field
It the utility model is related to field of communication technology, more particularly to a kind of I for strengthening antijamming capability2C buses.
Background technology
I2C buses are a kind of simple, bidirectional two-line synchronous serial bus.I at present2C is chiefly used in the communication in plate, and sets
Relatively long distance communication between standby, particularly under forceful electric power magnetic environment, can cause the unstable of communication or even damage device, so that
Its application range receives larger limitation.
Utility model content
The main purpose of the utility model is that propose a kind of I for strengthening antijamming capability2C buses, it is intended to solve existing
I under bad electromagnetic environment in technology2The problem of long distance transmission poor reliability of C bus signals.
To achieve the above object, a kind of I for strengthening antijamming capability provided by the utility model2C buses, including：Connection
Communication cable between host and slave, the communication cable include：Serial data line, serial time clock line, the first ground wire,
Two ground wires, with second ground wire altogether, the serial data line is with first ground wire respectively by insulating for first ground wire
Layer cladding mutually twists into the first twisted-pair feeder, and the serial time clock line is coated by insulating layer and mutually turned round respectively with second ground wire
It is twisted into the second twisted-pair feeder.
Optionally, the bus further includes power cord and the 3rd ground wire, the 3rd ground wire with first ground wire altogether,
The power cord mutually twists into the 3rd twisted-pair feeder by insulating layer cladding respectively with the 3rd ground wire.
Optionally, in the interface of the communication cable and the host and connecing for the communication cable and the slave
At mouthful, decoupling capacitance is respectively arranged between the power cord and the 3rd ground wire.
Optionally, the bus further includes control line and the 4th ground wire, the 4th ground wire with first ground wire altogether,
The control line mutually twists into the 4th twisted-pair feeder by insulating layer cladding respectively with the 4th ground wire.
Optionally, it is provided with metal screen layer outside the communication cable.
Optionally, the metal screen layer includes aluminium foil layer and metal knitted stratum reticulare.
Optionally, the communication cable is respectively connected with by metal RJ45 connectors and the host, the slave, described
Metal screen layer is connected with the metal shell of the metal RJ45 connectors.
Optionally, the communication cable is ethernet line.
Optionally, the communication cable and the junction of the host and the connection of the communication cable and the slave
Place is respectively arranged with low-pass filter circuit.
Optionally, the communication cable and the junction of the host and the connection of the communication cable and the slave
Place is respectively arranged with clamping protective circuit.
The I for the enhancing antijamming capability that the embodiment of the utility model provides2C buses, it is logical between host and slave
Interrogate in cable, serial data line is mutually wound twisted-pair feeder with a ground wire respectively with serial time clock line, due to every group of multiple twin
Two lines in line are closely wound, even if external environment, there are certain electromagnetic interference, the electromagnetic interference is caused by this two lines
Influence it is also essentially identical, identical electromagnetic interference can be balanced out using differential principle so that serial data line and serially
The transmission signal of clock line is more accurately and reliably.
Brief description of the drawings
Fig. 1 is the I for the enhancing antijamming capability that the utility model embodiment provides2A kind of structure diagram of C buses.
Fig. 2 is the I for the enhancing antijamming capability that the utility model embodiment provides2Another structure diagram of C buses.
Fig. 3 is the I for the enhancing antijamming capability that the utility model embodiment provides2Another structure diagram of C buses.
Fig. 4 is the I for the enhancing antijamming capability that the utility model embodiment provides2A kind of circuit diagram of C buses.
Fig. 5 is the I for the enhancing antijamming capability that the utility model embodiment provides2A kind of application schematic diagram of C buses.
Reference numeral：
1~host；2~slave；3~communication cable；31~serial data line；32~serial time clock line；33~the first ground
Line；34 second ground wires；35~power cord；36 the 3rd ground wires；37~control line；38~the 4th ground wire；4~low-pass filter circuit.
Embodiment
It should be appreciated that specific embodiment described herein is not used to limit this only to explain the utility model
Utility model.
As shown in Figure 1, the embodiment of the utility model provides a kind of I for strengthening antijamming capability2C buses, including：
The communication cable 3 being connected between host 1 and slave 2.Communication cable 3 includes serial data line 31, serial clock
Line 32, the first ground wire 33 and the second ground wire 34, the first ground wire 33 and the second ground wire 34 are altogether.
31 and first ground wire 33 of serial data line mutually twists into the first twisted-pair feeder by insulating layer cladding respectively.Serial clock
32 and second ground wire 34 of line mutually twists into the second twisted-pair feeder by insulating layer cladding respectively.
The I for the enhancing antijamming capability that the embodiment of the utility model provides2C buses, between host 1 and slave 2
In communication cable, serial data line 31 is mutually wound twisted-pair feeder with a ground wire respectively with serial time clock line 32, due to every
Two lines in group twisted-pair feeder are closely wound, even if external environment, there are certain electromagnetic interference, the electromagnetic interference is to this two lines
Caused by influence also essentially identical, identical electromagnetic interference can be balanced out using differential principle, so that serial data line
31 and serial time clock line 32 transmission signal more accurately and reliably.
Further, in the I of enhancing antijamming capability2In C buses, transmit data except through serial data line 31, lead to
Cross serial time clock line 32 to transmit outside clock signal, in a kind of embodiment of the utility model, between host 1 and slave 2
Power supply signal can also be transmitted, i.e. power cord 35 can also be included in communication cable 3.In order to reduce outside electromagnetic interference to I2C
The influence of bus transfer signal, except being carried out to serial data line 31, these signals transmission circuit of serial time clock line 32 at multiple twin
Outside reason, multiple twin processing can also be carried out to power cord 35.
For example, as shown in Fig. 2, another ground wire, i.e. the 3rd ground wire 36 can be drawn in the ground pin on host 1,
It is connected with the ground pin on slave 2.First ground wire 33, the second ground wire 34,35 three of the 3rd ground wire are altogether.Power cord 35 and the 3rd
Ground wire 36 can mutually twist into the 3rd twisted-pair feeder by insulating layer cladding respectively, since the two lines in every group of twisted-pair feeder closely twine
Around, though external environment there are certain electromagnetic interference, the electromagnetic interference influenced caused by this two lines it is also essentially identical, can be with
Identical electromagnetic interference is balanced out using differential principle.
Optionally, in order to eliminate the coupled capacitor effect between 35 and the 3rd ground wire 36 of power cord, in communication cable 3 and master
The interface and communication cable 3 of machine 1 and the interface of slave 2, are respectively arranged between 35 and the 3rd ground wire 36 of power cord and move back
Coupling capacitance.
Further, as shown in figure 3, in another embodiment of the utility model, the biography between host 1 and slave 2
Defeated signal may also include control signal, which can be transmitted by control line 37 special between host 1 and slave 2.
In order to reduce influence of the electromagnetic interference to control signal, a ground wire, i.e. the 4th ground can be drawn again at the ground pin of host
Line 38, the 4th ground wire 38 and the first ground wire 33 are altogether；37 and the 4th ground wire 38 of control line coats mutual twisting by insulating layer respectively
Into the 4th twisted-pair feeder.4th twisted-pair feeder and the first twisted-pair feeder, the second twisted-pair feeder, the 3rd twisted-pair feeder are together as communication cable.This
Sample, the data transmitted between host 1 and slave 2, clock, power supply and control signal can be dropped by the form of twisted-pair feeder
The influence of low external interference.Because when the conducting wire that edge is thoroughly done away with two twists together mutually, interference signal acts on this two phases
It is easier to carry out common mode interference when being consistent on the mutual conducting wire kinked together, be a kind of common-mode signal, and receiving signal
Suppress, so as to improve signal identification accuracy rate, strengthen antijamming capability.
In order to further reduce outside electromagnetic interference to I2The influence of C bus transfer signals, communication cable outside can also be set
It is equipped with metal screen layer.Optionally, which may include aluminium foil layer and/or metal knitted stratum reticulare.Wherein, it is metal knitted
Stratum reticulare can mask extraneous low frequency electromagnetic interference, and aluminium foil layer can mask extraneous high-frequency electromagnetic interference, and user can basis
Actual conditions select suitable shielded layer.
In order to make shielded layer realize more preferable shield effectiveness, in one embodiment of the utility model, communication cable can
To be respectively connected with by metal RJ45 connectors and host 1, slave 2；Outside the metal of metal screen layer and metal RJ45 connectors
Shell phase connects, so as to be grounded by the metal shell.
Optionally, in the embodiment of the utility model, communication cable both can utilize a plurality of electric wire point according to specific requirements
Do not reverse two-by-two and form multigroup twisted-pair feeder, unify to set metal screen layer and insulating layer again outside multigroup twisted-pair feeder, also may be used
To utilize ready-made cable.For example, the communication cable can be ethernet line.There are four groups of twisted-pair feeders in ethernet line, just
31 and first ground wire 33 of serial data line, 32 and second ground wire 34 of serial time clock line, 35 and the 3rd ground wire of power cord can be used as
36th, control line 37 is used with the 4th ground wire 38.
Outside electromagnetic interference is mainly reduced in terms of the setting of cable above to I2The influence of C bus signals, but this practicality
New embodiment not limited to this., can also be by suitable circuit design into one in the other embodiment of the utility model
Step reduces electromagnetic interference, improves I2The signal transmission quality of C buses.
Specifically, as shown in figure 4, in one embodiment of the utility model, the connection of communication cable 3 and host 1
Place and communication cable 3 and the junction of slave 2 are respectively arranged with low-pass filter circuit 4.Resistance R1 and capacitance C1 forms single order
Low-pass filter circuit, makes the relatively low normal communications signal of frequency by while by extraneous high-frequency interferencing signal and spike
Etc. filtering out, low-pass filter circuit can be specifically configured by frequency according to actual needs, the embodiment of the utility model
This is not limited.Certainly, in the other embodiment of the utility model, the wave filter of other forms, such as two can also be used
Rank low-pass filter circuit etc., as long as filtering out to outside electromagnetic interference can be realized.
The spike caused by electromagnetic interference can be such that circuit transient voltage drastically raises, so as to influence signal accuracy
Even cause damage to component, in order to suppress these spikes, in one embodiment of the utility model, communication cable
With the junction of the junction of host 1 and communication cable and slave 2 be respectively arranged with clamping protective circuit (D1, D2, D3,
D4).When the voltage in circuit is higher than supply voltage or less than ground voltage, corresponding diode current flow can be made, by circuit
Voltage is limited in ground voltage between supply voltage VCC, effectively increases signal accuracy, it also avoid that component is caused to damage
Evil.
I below by specific embodiment to enhancing antijamming capability provided by the utility model2C buses carry out specifically
It is bright.
As shown in figure 5, in the equipment of temperature and humidity monitoring is carried out to environment, Temperature Humidity Sensor and environmental control
All it is installed in large power electric control cabinet, electromagnetic environment is very severe.This is connected between Temperature Humidity Sensor and environmental control
The I for the enhancing antijamming capability that utility model provides2C buses.Longest distance is 4 meters between sensor and controller.
Specifically, Temperature Humidity Sensor HRTM-320 is I as slave (slave device), its interface2C bus forms,
Interface signal include serial clock SCL, serial clock SDA, sensor control CTRL, power supply VCC, GND.Controller
OEC3200 is as host (main equipment), except offer I2Outside C bus signals, it is also necessary to provide power supply VCC to sensor and control is believed
Number CTRL.
In order to reach the I under bad electromagnetic environment2C bus long range reliable communicatings, can use following circuit structure：
SCL on host, slave, using the circuit shown in Fig. 4, there is low-pass filter circuit and clamper to protect with SDA signal
Circuit；
CTRL signal on host, slave is protected using diode clamp；
Larger decoupling capacitance is placed on host, slave between the VCC and GND of interface；
The suitable TVS of power (Transient Voltage are placed on host, slave between the VCC and GND of interface
Suppressor, transient diode)；
Host, slave signaling interface use standard metal shell RJ45 connectors, and shell connects protecting field；
Communication cable uses the ethernet line with shielded layer of standard, internal 4 pairs of twisted-pair feeders.Signal is used in signal distribution
With the mode of GND multiple twins, i.e.,：SCL is with GND, SDA and GND, CTRL and GND, VCC and GND respectively using a pair of of twisted-pair feeder.
After this technology, communication robust is obviously improved, and effectively improves the communication quality of sensor and controller,
Avoid the appearance of communicating interrupt or error in data.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or device including a series of elements not only include those key elements, and
And other elements that are not explicitly listed are further included, or further include as this process, method, article or device institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Also there are other identical element in the process of key element, method, article or device.
It these are only the preferred embodiment of the utility model, it does not limit the scope of the patent of the present invention, every
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is directly or indirectly used in
Other related technical areas, are equally included in the patent within the scope of the utility model.
Claims (10)
- A kind of 1. I for strengthening antijamming capability2C buses, it is characterised in that including：The communication cable being connected between host and slave,The communication cable includes：Serial data line, serial time clock line, the first ground wire, the second ground wire, first ground wire and institute State the second ground wire altogether,The serial data line mutually twists into the first twisted-pair feeder by insulating layer cladding respectively with first ground wire,The serial time clock line mutually twists into the second twisted-pair feeder by insulating layer cladding respectively with second ground wire.
- 2. the I of enhancing antijamming capability according to claim 12C buses, it is characterised in thatFurther include power cord and the 3rd ground wire, the 3rd ground wire with first ground wire altogether, the power cord and described the Three ground wires mutually twist into the 3rd twisted-pair feeder by insulating layer cladding respectively.
- 3. the I of enhancing antijamming capability according to claim 22C buses, it is characterised in thatIn the interface of the interface and the communication cable and the slave of the communication cable and the host, the electricity Decoupling capacitance is respectively arranged between source line and the 3rd ground wire.
- 4. the I of enhancing antijamming capability according to claim 12C buses, it is characterised in thatFurther include control line and the 4th ground wire, the 4th ground wire with first ground wire altogether, the control line and described the Four ground wires mutually twist into the 4th twisted-pair feeder by insulating layer cladding respectively.
- 5. the I of enhancing antijamming capability according to any one of claim 1 to 42C buses, it is characterised in thatMetal screen layer is provided with outside the communication cable.
- 6. the I of enhancing antijamming capability according to claim 52C buses, it is characterised in thatThe metal screen layer includes aluminium foil layer and metal knitted stratum reticulare.
- 7. the I of enhancing antijamming capability according to claim 52C buses, it is characterised in thatThe communication cable is respectively connected with by metal RJ45 connectors and the host, the slave, the metal screen layer It is connected with the metal shell of the metal RJ45 connectors.
- 8. the I of enhancing antijamming capability according to claim 12C buses, it is characterised in thatThe communication cable is ethernet line.
- 9. the I of enhancing antijamming capability according to claim 12C buses, it is characterised in thatThe communication cable is set respectively with the junction of the host and the junction of the communication cable and the slave There is low-pass filter circuit.
- 10. the I of enhancing antijamming capability according to claim 12C buses, it is characterised in thatThe communication cable is set respectively with the junction of the host and the junction of the communication cable and the slave There is clamping protective circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219107.0U CN207319794U (en) | 2017-09-21 | 2017-09-21 | A kind of I for strengthening antijamming capability2C buses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721219107.0U CN207319794U (en) | 2017-09-21 | 2017-09-21 | A kind of I for strengthening antijamming capability2C buses |
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| Publication Number | Publication Date |
|---|---|
| CN207319794U true CN207319794U (en) | 2018-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721219107.0U Active CN207319794U (en) | 2017-09-21 | 2017-09-21 | A kind of I for strengthening antijamming capability2C buses |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114648867A (en) * | 2022-02-18 | 2022-06-21 | 广东逸动科技有限公司 | Remote control signal processing system of propeller, propeller and water vehicle |
-
2017
- 2017-09-21 CN CN201721219107.0U patent/CN207319794U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114648867A (en) * | 2022-02-18 | 2022-06-21 | 广东逸动科技有限公司 | Remote control signal processing system of propeller, propeller and water vehicle |
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