CN106855849A - A kind of DEU data exchange unit between iic bus and CAN - Google Patents
A kind of DEU data exchange unit between iic bus and CAN Download PDFInfo
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- CN106855849A CN106855849A CN201710151283.3A CN201710151283A CN106855849A CN 106855849 A CN106855849 A CN 106855849A CN 201710151283 A CN201710151283 A CN 201710151283A CN 106855849 A CN106855849 A CN 106855849A
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- data exchange
- microprocessor
- exchange unit
- transceiver
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- 230000002146 bilateral effect Effects 0.000 claims description 26
- 230000005611 electricity Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 13
- 238000004891 communication Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013500 data storage Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
- G06F13/4291—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a clocked protocol
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0016—Inter-integrated circuit (I2C)
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/40—Bus coupling
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- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Dc Digital Transmission (AREA)
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Abstract
The invention discloses a kind of DEU data exchange unit between iic bus and CAN, DEU data exchange unit is arranged between iic bus and CAN, and DEU data exchange unit includes:Digital isolator, microprocessor and CAN transceiver.Digital isolator one end is connected to iic bus, and the other end is connected to microprocessor;Microprocessor one end is connected to digital isolator, and the other end is connected to CAN transceiver;CAN transceiver one end is connected to microprocessor, and the other end is connected to CAN.DEU data exchange unit of the invention can be used for iic bus and CAN data exchange, realize that signal is changed.
Description
Technical field
The present invention relates to hardware communications field, more particularly to a kind of data exchange between iic bus and CAN
Device.
Background technology
Iic bus are a kind of two-wire, two-way, universal serial bus, and bus is made up of two lines, and one is serial time clock line CLK,
One is serial number line SDA, and the equipment room in bus is simple master slave relation, iic bus signal under the cooperation of CLK clocks,
SDA transmits data, has initial signal, data-signal, answer signal, stop signal etc. in IIC communications.
CAN is a kind of serial communication protocol bus for real-time application, and it comes transmission signal, one using twisted-pair feeder
Bar is serial data line CANH, and another is serial data line CANL, its potential difference transmission signal for passing through two signal lines.Such as
Fruit CANH level is more than CANL level 2V for dominant level represents signal " 0 ", if it is recessiveness that CANH level is equal to CANL level
Level represents signal " 1 ", and data frame, remote frame, mistake frame data format are generally used during communication.
Because two kinds of communication mode mechanism are different so that two kinds of communication bus can not be directly compatible with.
The content of the invention
It is an object of the invention to provide a kind of DEU data exchange unit between iic bus and CAN, to solve mesh
The problem that signal cannot communicate between preceding iic bus and CAN.
In the present invention, the invention provides a kind of DEU data exchange unit between iic bus and CAN, institute
State DEU data exchange unit to be arranged between the iic bus and CAN, the DEU data exchange unit includes:Digital isolator,
Microprocessor and CAN transceiver;
Described digital isolator one end is connected to the iic bus, and the other end is connected to the microprocessor;
Described microprocessor one end is connected to the digital isolator, and the other end is connected to the CAN transceiver;And
Described CAN transceiver one end is connected to the microprocessor, and the other end is connected to the CAN.
In another preference, the DEU data exchange unit also includes moment stable state bilateral diode.
In another preference, the DEU data exchange unit also includes the first electric capacity and the second electric capacity, first electric capacity
One end and one end of second electric capacity be commonly connected to power end, the pin of the CAN transceiver one is connected to the power supply
End;And
The other end common ground of the other end of first electric capacity and second electric capacity.
In another preference, the iic bus include SDA line and CLK lines;
The digital isolator includes multiple pins, wherein the 4th pin and the 5th pin of the digital isolator are common
The SDA line is connected to, the 6th pin of the digital isolator is connected to the CLK lines;
12nd pin of the digital isolator and the 13rd pin are commonly connected to the microprocessor;And
11st pin of the digital isolator is connected to the microprocessor.
In another preference, the microprocessor includes multiple pins, wherein the first pin of the microprocessor connects
The 12nd pin and the 13rd pin of the digital isolator are connected to, the second pin of the microprocessor is connected to the number
11st pin of word isolator;And
3rd pin of the microprocessor and the 4th pin are all connected to the CAN transceiver.
In another preference, the CAN transceiver includes multiple pins, wherein the first pin of the CAN transceiver
The 4th pin of the microprocessor is connected to, the 4th pin of the CAN transceiver is connected to the 3rd of the microprocessor
Pin;And
6th pin of the CAN transceiver and the 7th pin are all connected to the CAN.
In another preference, the CAN includes CANL lines and CANH lines;
The CANL lines are connected to the 6th pin of the CAN transceiver;And
The CANH lines are connected to the 7th pin of the CAN transceiver.
In another preference, the moment stable state bilateral diode includes the first stable state bilateral diode and the second stable state
Bilateral diode;
One end of the first stable state bilateral diode is connected to the CANL lines, the second stable state bilateral diode
One end is connected to the CANH lines;And
The other end of the first stable state bilateral diode connects jointly with the other end of the second stable state bilateral diode
Ground.
In another preference, first resistor is connected between the 6th pin and the CANL lines of the CAN transceiver, institute
State and be connected to second resistance between the 7th pin of CAN transceiver and the CANH lines;And
3rd resistor is connected between the CANL lines and CANH lines.
In another preference, the first diode is connected between the 5th pin of the digital isolator and the SDA line,
The forward end of first diode is connected to the 5th pin of the digital isolator, and the backward end of first diode connects
It is connected to the SDA line;And
The second diode is connected between 13rd pin and the first pin of the microprocessor of the digital isolator,
The forward end of second diode is connected to the 13rd pin of the digital isolator, the backward end of second diode
It is connected to the first pin of the microprocessor.
In another preference, first pin and the 16th pin of the digital isolator are all connected to power end.
In another preference, the second pin of the digital isolator, the 8th pin, the 9th pin and the 15th pin
It is grounded.
In another preference, the second pin ground connection of the CAN transceiver.
In another preference, described moment stable state bilateral diode one end is connected to the CAN, another termination
Ground.
In another preference, the 3rd pin of the CAN transceiver is connected to power end.
In another preference, the DEU data exchange unit also includes the 3rd electric capacity and the 4th electric capacity;
Described 3rd electric capacity one end is connected to the SDA line, other end ground connection;
Described 4th electric capacity one end is simultaneously anti-phase with the 12nd pin and second diode of the digital isolator
End is connected, other end ground connection.
In another preference, the power end of the first pin of digital isolator connection and the digital isolator
The power end of the 16th pin connection is different power ends.
In another preference, the resistance of the first resistor is 30-40 Ω, and the resistance of the second resistance is 30-40
Ω。
In another preference, the resistance of the 3rd resistor is 100-130 Ω.
In another preference, first capacitance size is 8-12uF, and second capacitance size is 0.1-0.3uF.
It should be understood that within the scope of the present invention, above-mentioned each technical characteristic of the invention and have in below (eg embodiment)
Can be combined with each other between each technical characteristic of body description, so as to constitute new or preferred technical scheme.As space is limited, exist
This is no longer repeated one by one.
Brief description of the drawings
Fig. 1 is the structural representation of the DEU data exchange unit in one embodiment of the invention.
Fig. 2 is the structural representation of the DEU data exchange unit in one embodiment of the invention.
Specific embodiment
The present inventor develops a kind of between iic bus and CAN first by in-depth study extensively
DEU data exchange unit, the DEU data exchange unit includes:Digital isolator, microprocessor and CAN transceiver, the DEU data exchange unit
Iic bus and CAN data can be swapped so that two kinds of buses on this basis, can complete this hair with compatibility
It is bright.
DEU data exchange unit
The invention provides a kind of DEU data exchange unit between iic bus and CAN, the DEU data exchange unit
It is arranged between the iic bus and CAN, the DEU data exchange unit includes:Digital isolator, microprocessor and CAN
Transceiver, iic bus are connected with digital isolator passage, and digital isolator is connected with microprocessor again, the CAN of microprocessor
Communication interface is connected with CAN transceiver, and CAN transceiver accesses CAN.
By input microprocessor after digital isolator, microprocessor is sent to CAN to iic bus signal after signal is changed
Transceiver, in recently entering CAN;CAN signal is admitted to microprocessor by CAN transceiver, and microprocessor will
Digital isolator is sent to after signal conversion, digital isolator inputs a signal into iic bus again, and digital isolator plays bus guarantor
The effect of shield.
Hardware aspect of the present invention including the building of hardware circuit, the type selecting of device etc., program aspect include I/O initialization,
IIC interface initializations, CAN interface initialization, data storage area initialization, queue initialization, interrupt initialization, fault-tolerant initial
Change, abnormality processing initialization etc..
In terms of programming, iic bus communication is divided into data communication two between the communication of reading deposit data storage chip and device
Kind of pattern, reads deposit data storage chip and communicates for the data read and write in pin-saving chip, and data communication is used for device between device
Information transmission between part.
The power end on digital isolator both sides of the invention is different power ends, play electrical isolation effect, numeral every
Signal isolation effect is played from device.
Microprocessor has CAN interface and I/O interface, while should have the data-handling capacity of higher-frequency, to meet
The data-handling capacity of CAN high frequency, the microprocessor small volume, low in energy consumption, reliability are high, versatility is high, cheap.
Main advantages of the present invention include:
A iic bus signal can be converted into CAN signal by () present invention, while can change CAN signal
It is iic bus signal, solves the problems, such as that two kinds of communications can not be compatible, can be logical in existing iic bus order wire or CAN
The device is directly accessed in letter circuit, realizes that signal is changed.
B () digital isolator plays bus protection, signal isolation effect, digital isolator the right and left uses different electricity
Source, plays electrical isolation effect.
C () is respectively connected to a moment stable state bilateral diode in CANH and CANL two lines, play antistatic and mistake
The effect of high-low pressure.
D () the first diode and the second diode pair SDA data play set direction effect.
E () first electric capacity plays decoupling effect, the second electric capacity is played and filters high frequency effect.
F () the 3rd electric capacity and the 4th electric capacity play signal filtering effect.
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.The experimental technique of unreceipted actual conditions in the following example, generally according to conventional strip
Part, or according to the condition proposed by manufacturer.Unless otherwise indicated, otherwise percentage and number are percentage by weight and weight
Number.
It should be noted that in the claim and specification of this patent, such as first and second or the like relation
Term is used merely to make a distinction an entity or operation with another entity or operation, and not necessarily requires or imply
There is any this actual relation or order between these entities or operation.And, term " including ", "comprising" or its
Any other variant is intended to including for nonexcludability so that process, method, article including a series of key elements or
Equipment not only includes those key elements, but also other key elements including being not expressly set out, or also include for this process,
Method, article or the intrinsic key element of equipment.In the absence of more restrictions, by wanting that sentence " including " is limited
Element, it is not excluded that also there is other identical element in the process including the key element, method, article or equipment.
Embodiment 1
As shown in figure 1, present embodiments providing a kind of DEU data exchange unit between iic bus and CAN, institute
State DEU data exchange unit to be arranged between the iic bus 1 and CAN 5, the DEU data exchange unit includes:Numeral isolation
Device 2, microprocessor 3 and CAN transceiver 4.
The one end of the digital isolator 2 is connected to the iic bus 1, and the other end is connected to the microprocessor 3;It is described
The one end of microprocessor 3 is connected to the digital isolator 2, and the other end is connected to the CAN transceiver 4;And the CAN transmitting-receivings
The one end of device 4 is connected to the microprocessor 3, and the other end is connected to the CAN 5.
Embodiment 2
A kind of DEU data exchange unit between iic bus and CAN is present embodiments provided, in the present embodiment
DEU data exchange unit is similar to the DEU data exchange unit in embodiment 1, difference:
With reference to Fig. 1 and Fig. 2, in the present embodiment, the iic bus 1 include SDA line 6 and CLK lines 7;
The digital isolator 2 includes multiple pins, and 1a-16a is 16 pins of digital isolator 2, wherein institute in Fig. 2
The 4th pin 4a and the 5th pin 5a for stating digital isolator 2 are commonly connected to the SDA line 6, the of the digital isolator 2
Six pin 6a are connected to the CLK lines 7, and the 12nd pin 12a of the digital isolator 2 and the 13rd pin 13a connect jointly
The microprocessor 3 is connected to, the 11st pin 11a of the digital isolator 2 is connected to the microprocessor 3;
The first diode 8, the described 1st are connected between the 5th pin 5a and the SDA line 6 of the digital isolator 2
The forward end of pole pipe 8 is connected to the 5th pin 5a of the digital isolator 2, and the backward end of first diode 8 is connected to
The SDA line 6, the two or two is connected between the 13rd pin 13a and the pin of the microprocessor 3 one of the digital isolator 2
Pole pipe 9, the forward end of second diode 9 is connected to the 13rd pin 13a of the digital isolator 2, the described 2nd 2
The backward end of pole pipe 9 is connected to the pin of the microprocessor 3 one, and the first diode 8 and the second diode 9 are played to SDA data
Set direction is acted on;
The microprocessor 3 includes multiple pins, and 1b-4b is 4 pins of microprocessor 3 in Fig. 2, wherein micro- place
Manage device 3 the first pin 1b be connected to the digital isolator 2 the 12nd pin 12b and second diode 9 it is reverse
End, the second pin 2b of the microprocessor 3 is connected to the 11st pin 11a of the digital isolator 2, the microprocessor
3 the 3rd pin 3b and the 4th pin 4b are all connected to the CAN transceiver 4;
The CAN transceiver 4 includes multiple pins, and 1c-8c is 8 pins of CAN transceiver 4 in Fig. 2, wherein described
First pin 1c of CAN transceiver 4 is connected to the 4th pin 4b of the microprocessor 3, and the 4th of the CAN transceiver 4 draws
Pin 4c is connected to the 3rd pin 3b of the microprocessor 3, and the 6th pin 6c of the CAN transceiver 4 and the 7th pin 7c are equal
It is connected to the CAN 5;
The CAN 5 includes CANL lines 10 and CANH lines 11, and the CANL lines 10 are connected to the CAN transceiver 4
6th pin 6c, the CANH lines 11 are connected to the 7th pin 7c of the CAN transceiver 4;
The DEU data exchange unit also includes moment stable state bilateral diode, and the moment stable state bilateral diode includes the
One stable state bilateral diode 12 and the second stable state bilateral diode 13, one end of the first stable state bilateral diode 12 are connected to
The CANL lines 10, one end of the second stable state bilateral diode 13 is connected to the CANH lines 11, and first stable state is double
To the other end common ground of the other end and the second stable state bilateral diode 13 of diode 12;
The DEU data exchange unit also includes the first electric capacity 14 and the second electric capacity 15, one end of first electric capacity 14 and institute
The one end for stating the second electric capacity 15 is commonly connected to power end, and the 3rd pin 3c of the CAN transceiver 4 is connected to power end, institute
The other end of the first electric capacity 14 and the other end common ground of second electric capacity 15 are stated, the first electric capacity 14 plays decoupling effect,
Second electric capacity 15 is played and filters high frequency effect;
The DEU data exchange unit also includes the 3rd electric capacity 16 and the 4th electric capacity 17, and described one end of 3rd electric capacity 16 is connected to
The SDA line 6, other end ground connection, described one end of 4th electric capacity 17 the 12nd pin 12a simultaneously with the digital isolator 2
It is connected with the end of oppisite phase of the second diode 9, other end ground connection;
First resistor 18 is connected between the 6th pin 6c and the CANL lines 10 of the CAN transceiver 4, the CAN is received
Second resistance 19 is connected between the 7th pin 7c and the CANH lines 11 that send out device 4;Between the CANL lines 10 and CANH lines 11
Be connected to 3rd resistor 20, first resistor 18 and second resistance 19 play a part of Anti-surging, 3rd resistor 20 play impedance matching,
The effect for reduce signal reflex, reducing noise and avoid signal concussion;
First pin 1a of the digital isolator 2 and the 16th pin 16a are all connected to power end;
The second pin 2a of the digital isolator 2, the 8th pin 8a, the 9th pin 9a and the 15th pin 15a connect
Ground;
The second pin 2c ground connection of the CAN transceiver 4;
Described moment stable state bilateral diode one end is connected to the CAN 5, other end ground connection;
3rd pin 3c of the CAN transceiver 4 is connected to power end.
Embodiment 3
A kind of DEU data exchange unit between iic bus and CAN is present embodiments provided, in the present embodiment
DEU data exchange unit is similar to the DEU data exchange unit in embodiment 2, difference:
In the present embodiment, the power end of the first pin connection of the digital isolator and the tenth of the digital isolator the
The power end of six pins connection is different power ends;
The resistance of the first resistor is 35 Ω, and the resistance of the second resistance is 35 Ω;
The resistance of the 3rd resistor is 120 Ω;
First capacitance size is 10uF, and second capacitance size is 0.1uF.
The all documents referred in the present invention are all incorporated as reference in this application, independent just as each document
It is incorporated as with reference to such.In addition, it is to be understood that after above-mentioned instruction content of the invention has been read, those skilled in the art can
Made various changes or modifications with to the present invention, these equivalent form of values equally fall within the model that the application appended claims are limited
Enclose.
Claims (10)
1. a kind of DEU data exchange unit between iic bus and CAN, it is characterised in that the DEU data exchange unit
It is arranged between the iic bus and CAN, the DEU data exchange unit includes:Digital isolator, microprocessor and CAN
Transceiver;
Described digital isolator one end is connected to the iic bus, and the other end is connected to the microprocessor;
Described microprocessor one end is connected to the digital isolator, and the other end is connected to the CAN transceiver;And
Described CAN transceiver one end is connected to the microprocessor, and the other end is connected to the CAN.
2. DEU data exchange unit according to claim 1, it is characterised in that the DEU data exchange unit also includes that moment is steady
State bilateral diode.
3. DEU data exchange unit according to claim 1, it is characterised in that the DEU data exchange unit also includes the first electricity
Hold and the second electric capacity, one end of one end of first electric capacity and second electric capacity is commonly connected to power end, and the CAN is received
The hair pin of device one is connected to the power end;And
The other end common ground of the other end of first electric capacity and second electric capacity.
4. DEU data exchange unit according to claim 2, it is characterised in that the iic bus include SDA line and CLK lines;
The digital isolator includes multiple pins, wherein the 4th pin and the 5th pin of the digital isolator are connected jointly
In the SDA line, the 6th pin of the digital isolator is connected to the CLK lines;
12nd pin of the digital isolator and the 13rd pin are commonly connected to the microprocessor;And
11st pin of the digital isolator is connected to the microprocessor.
5. DEU data exchange unit according to claim 4, it is characterised in that the microprocessor includes multiple pins, its
Described in the first pin of microprocessor be connected to the 12nd pin and the 13rd pin of the digital isolator, micro- place
The second pin for managing device is connected to the 11st pin of the digital isolator;And
3rd pin of the microprocessor and the 4th pin are all connected to the CAN transceiver.
6. DEU data exchange unit according to claim 5, it is characterised in that the CAN transceiver includes multiple pins, its
Described in the first pin of CAN transceiver be connected to the 4th pin of the microprocessor, the 4th pin of the CAN transceiver
It is connected to the 3rd pin of the microprocessor;And
6th pin of the CAN transceiver and the 7th pin are all connected to the CAN.
7. DEU data exchange unit according to claim 6, it is characterised in that the CAN includes CANL lines and CANH
Line;
The CANL lines are connected to the 6th pin of the CAN transceiver;And
The CANH lines are connected to the 7th pin of the CAN transceiver.
8. DEU data exchange unit according to claim 7, it is characterised in that the moment stable state bilateral diode includes the
One stable state bilateral diode and the second stable state bilateral diode;
One end of the first stable state bilateral diode is connected to the CANL lines, one end of the second stable state bilateral diode
It is connected to the CANH lines;And
The other end common ground of the other end of the first stable state bilateral diode and the second stable state bilateral diode.
9. DEU data exchange unit according to claim 8, it is characterised in that the 6th pin of the CAN transceiver and institute
State and be connected to first resistor between CANL lines, second resistance is connected between the 7th pin and the CANH lines of the CAN transceiver;
And
3rd resistor is connected between the CANL lines and CANH lines.
10. DEU data exchange unit according to claim 4, it is characterised in that the 5th pin of the digital isolator and
The first diode is connected between the SDA line, the forward end of first diode is connected to the 5th of the digital isolator
Pin, the backward end of first diode is connected to the SDA line;And
The second diode is connected between 13rd pin and the first pin of the microprocessor of the digital isolator, it is described
The forward end of the second diode is connected to the 13rd pin of the digital isolator, the backward end connection of second diode
In the first pin of the microprocessor.
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CN201710151283.3A CN106855849B (en) | 2017-03-14 | 2017-03-14 | Data exchange device used between IIC bus and CAN bus |
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Cited By (1)
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CN111149327A (en) * | 2017-08-08 | 2020-05-12 | 罗伯特·博世有限公司 | Transmitting/receiving device for a bus system and method for reducing the tendency of oscillations during transitions between different bit states |
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2017
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CN201604665U (en) * | 2009-11-02 | 2010-10-13 | 北京全路通信信号研究设计院 | Communication interface equipment of train control center |
ITTO20110715A1 (en) * | 2011-08-01 | 2013-02-02 | Indesit Co Spa | INTERFACE DEVICE WITH A I2C-TYPE BIDIRECTIONAL BUS LINE |
CN207123834U (en) * | 2017-03-14 | 2018-03-20 | 上海蓝怡科技股份有限公司 | A kind of DEU data exchange unit being used between iic bus and CAN |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111149327A (en) * | 2017-08-08 | 2020-05-12 | 罗伯特·博世有限公司 | Transmitting/receiving device for a bus system and method for reducing the tendency of oscillations during transitions between different bit states |
CN111149327B (en) * | 2017-08-08 | 2022-03-01 | 罗伯特·博世有限公司 | Transmitting/receiving device for a bus system and method for reducing the tendency of oscillations during transitions between different bit states |
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