CN208506565U - A kind of peripheral circuit of CAN controller - Google Patents
A kind of peripheral circuit of CAN controller Download PDFInfo
- Publication number
- CN208506565U CN208506565U CN201821291042.5U CN201821291042U CN208506565U CN 208506565 U CN208506565 U CN 208506565U CN 201821291042 U CN201821291042 U CN 201821291042U CN 208506565 U CN208506565 U CN 208506565U
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- China
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- connect
- data line
- resistance
- filter circuit
- common mode
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Abstract
The utility model discloses a kind of peripheral circuits of CAN controller, including ESD protector, RC filter circuit, common mode inductance, CAN transceiver, 1st port of the ESD protector is connect with CAN high position data line, 2nd port of the ESD protector is connect with CAN low data line, one end of the RC filter circuit is connect with CAN high position data line, the other end of the RC filter circuit is connect with CAN low data line, the common mode inductance is connect with the CAN transceiver, the peripheral circuit includes resistance, one end of the resistance is connect with RC filter circuit, the other end of the resistance is connect with the different name end of the winding of the common mode inductance.The utility model may be implemented controller in bus find itself CAN-H or CAN-L open circuit after, the erroneous frame of transmission will not be detected by other Node Controllers, be not present other obstacles in the case where, guarantee the intact communication of whole network.
Description
Technical field
The utility model relates to a kind of peripheral circuits of CAN controller.
Background technique
Several Node Controllers are connected in CAN bus, Node Controller is in CAN-H data line or CAN-L data line
After open circuit, wrong frame data can be sent to CAN transceiver, CAN transceiver converts the data into differential signal, and to be transferred to CAN total
Line when other Node Controllers connected in CAN bus receive information, can receive these wrong frame informations together.But
ISO11898 do not provide a certain Node Controller after CAN-H data line or the open circuit of CAN-L data line, other node controls
Device processed needs to receive and toward the wrong frame data for sending response in bus.In other words, other Node Controllers whether receive and
Wrong frame data after responding CAN bus open circuit, do not affect its normal operation.So when some Node Controller exists
After CAN-H data line or CAN-L data line open circuit, if not taking certain measure, it will lead to other Node Controllers not
Disconnected reception simultaneously responds these wrong frame data, wastes time and reduce the efficiency of whole network data transmission.
Chinese invention patent CN201710823498.5 discloses examination device and the row of a kind of vehicle CAN bus erroneous frame
By complete, system investigation method the efficiency of erroneous frame investigation can be improved, so as to shorten the vehicle R&D cycle in checking method.
But there are some erroneous frames not transmit to CAN bus data and have an impact, it is more total to CAN than as noted above CAN controller
The erroneous frame generated after line open circuit using such examination device and checks method, not only higher cost but also the meeting ratio that operates
More many and diverse, the consuming time.
Utility model content
The purpose of the utility model is to provide a kind of peripheral circuits of CAN controller, so that Node Controller is deposited in bus
After CAN-H or CAN-L open circuit fault, the erroneous frame itself sent will not be detected by other Node Controllers, so not only
It will not influence other Node Controllers, and in the case of other obstacles are not present, it is ensured that the intact communication of whole network.
To achieve the goals above, the technical solution that the utility model is taken are as follows:
The peripheral circuit of CAN controller, including CAN high position data line, CAN low data line, ESD protector, RC filtering
1st port of circuit, common mode inductance, CAN transceiver, the ESD protector is connect with CAN high position data line, the ESD protection
2nd port of device is connect with CAN low data line, and one end of the RC filter circuit is connect with CAN high position data line, the RC
The other end of filter circuit is connect with CAN low data line, the first winding different name end of the common mode inductance, the second winding different name
End is connect with CAN high position data line and CAN low data line respectively, first Motor Winding Same Name of Ends of common mode inductance, the second winding
Same Name of Ends is connect with the CAN transceiver, and the peripheral circuit includes resistance, and one end of the resistance and RC filter circuit connect
It connects, the other end of the resistance is connect with the different name end of the winding of the common mode inductance.
The resistance is two.
The resistance value of the resistance is 43 ohm.
The RC filter circuit is more piece π type RC filter circuit.
The ESD protector is SOT-23 encapsulation series.
The model CMT-453230NX of the common mode inductance.
By adopting the above technical scheme, when some Node Controller generation CAN data line open circuit fault may be implemented, hair
The wrong frame data sent are not detected by other Node Controllers, not only will not influence other Node Controllers normal work, and
And improve the communication efficiency of whole network.
Detailed description of the invention
Below to each width attached drawing of the utility model specification expression content and figure in label be briefly described:
Fig. 1 is the circuit diagram of the peripheral circuit of the utility model CAN controller.
Label in above-mentioned figure is equal are as follows:
1, ESD protector 2.RC filter circuit 3, resistance 4, common mode inductance
5, the label in the above-mentioned figure of CAN transceiver is equal are as follows:
Specific embodiment
Specific embodiment of the present utility model is made into one by the description to optimum embodiment below against attached drawing
Step detailed description.
As shown in Figure 1, the peripheral circuit of the utility model CAN controller, including CAN high position data line, CAN low data
Line, ESD protector 1, RC filter circuit 2, common mode inductance 4, CAN transceiver 5, there are three ports for ESD protector 1, wherein the 1st end
Mouth is connect with CAN high position data line, and the 2nd port of ESD protector 1 is connect with CAN low data line, it is preferred that ESD protection
Device is using SOT-23 encapsulation series.RC filter circuit 2 is composed in series by two π type RC filter circuits, one end and CAN seniority top digit
It is connected according to line, the other end is connect with CAN low data line.The different name at the first winding different name end and the second winding of common mode inductance 4
End is connect with CAN high position data line and CAN low data line respectively, the first Motor Winding Same Name of Ends and the second winding of common mode inductance 4
Same Name of Ends connect with CAN transceiver 5, it is preferred that the model CMT-453230NX of the common mode inductance 4.In order to solve skill
Art problem, the peripheral circuit further include two resistance 3, and one end of one of resistance is connect with one end of RC filter circuit 2, separately
One end is connect with the different name end of the first winding of common mode inductance 4, and one end of another resistance and the other end of RC filter circuit 2 connect
It connects, the other end is connect with the different name end of the second winding of common mode inductance 4.
Two resistance 3 are sealed between RC filter circuit 2 and common mode inductance 4, may be implemented after disconnecting can signal, are risen
To the effect of level attenuation, so that the dominant level difference of error signal of the Node Controller active transmission after open circuit is less than 0.9V,
To prevent other Node Controllers from identifying the wrong data of the Node Controller active transmission, other nodes also would not be past
The wrong frame data of response are sent in bus.Seal in resistance 3 resistance value cannot it is excessive can not be too small, otherwise may cause other
Nodal test is to phenomenon of the failure, it is therefore desirable to balance its resistance value.Preferably, the resistance value of two resistance 3 is 43 ohm.
Obvious the utility model specific implementation is not subject to the restrictions described above, as long as the method for using the utility model
The improvement for the various unsubstantialities that conception and technical scheme carry out, both is within the protection scope of the present invention.
Claims (6)
1. a kind of peripheral circuit of CAN controller, it is characterised in that: including CAN high position data line, CAN low data line, ESD
Protector (1), RC filter circuit (2), common mode inductance (4), CAN transceiver (5), the 1st port of the ESD protector (1) with
The connection of CAN high position data line, the 2nd port of the ESD protector (1) are connect with CAN low data line, the RC filter circuit
(2) one end is connect with CAN high position data line, and the other end of the RC filter circuit (2) is connect with CAN low data line, institute
State the first winding different name end of common mode inductance (4), the second winding different name end respectively with CAN high position data line and CAN low data
Line connection, (4) first Motor Winding Same Name of Ends of common mode inductance, the second Motor Winding Same Name of Ends are connect with the CAN transceiver (5), institute
Stating peripheral circuit includes resistance (3), and one end of the resistance (3) is connect with RC filter circuit (2), the resistance (3) it is another
End is connect with the different name end of the winding of the common mode inductance (4).
2. the peripheral circuit of CAN controller according to claim 1, it is characterised in that: the resistance (3) is two.
3. the peripheral circuit of CAN controller according to claim 2, it is characterised in that: the resistance value of the resistance (3) is
43 ohm.
4. the peripheral circuit of CAN controller according to claim 1, it is characterised in that: the RC filter circuit (2) is more
Save π type RC filter circuit.
5. the peripheral circuit of CAN controller according to claim 1, it is characterised in that: the ESD protector (1) is
SOT-23 encapsulation series.
6. the peripheral circuit of CAN controller according to claim 1, it is characterised in that: the model of the common mode inductance (4)
For CMT-453230NX.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821291042.5U CN208506565U (en) | 2018-08-10 | 2018-08-10 | A kind of peripheral circuit of CAN controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821291042.5U CN208506565U (en) | 2018-08-10 | 2018-08-10 | A kind of peripheral circuit of CAN controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208506565U true CN208506565U (en) | 2019-02-15 |
Family
ID=65300123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821291042.5U Expired - Fee Related CN208506565U (en) | 2018-08-10 | 2018-08-10 | A kind of peripheral circuit of CAN controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208506565U (en) |
-
2018
- 2018-08-10 CN CN201821291042.5U patent/CN208506565U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190215 Termination date: 20200810 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |