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 PDF

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Publication number
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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China
Prior art keywords
pin
data exchange
microprocessor
exchange unit
transceiver
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CN201710151283.3A
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Chinese (zh)
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CN106855849B (en
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李子樵
汪飞
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ZHEJIANG LANYI PHARMACEUTICAL Co Ltd
SHANGHAI AILEX TECHNOLOGY Co Ltd
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ZHEJIANG LANYI PHARMACEUTICAL Co Ltd
SHANGHAI AILEX TECHNOLOGY Co Ltd
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Priority to CN201710151283.3A priority Critical patent/CN106855849B/en
Publication of CN106855849A publication Critical patent/CN106855849A/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38Information transfer, e.g. on bus
    • G06F13/40Bus structure
    • G06F13/4004Coupling between buses
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38Information transfer, e.g. on bus
    • G06F13/42Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
    • G06F13/4291Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a clocked protocol
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0016Inter-integrated circuit (I2C)
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/40Bus coupling

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Dc Digital Transmission (AREA)
  • Small-Scale Networks (AREA)

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

A kind of DEU data exchange unit between iic bus and CAN
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.
CN201710151283.3A 2017-03-14 2017-03-14 Data exchange device used between IIC bus and CAN bus Active CN106855849B (en)

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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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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 examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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