CN107239428A - Can interface circuit - Google Patents
Can interface circuit Download PDFInfo
- Publication number
- CN107239428A CN107239428A CN201710469447.7A CN201710469447A CN107239428A CN 107239428 A CN107239428 A CN 107239428A CN 201710469447 A CN201710469447 A CN 201710469447A CN 107239428 A CN107239428 A CN 107239428A
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- CN
- China
- Prior art keywords
- pin
- interface circuit
- resistor
- interface
- division
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Logic Circuits (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
A kind of CAN interface circuit includes the electric capacity of CAN interface chip, first to 3rd resistor and first.The CAN interface chip includes being used to be connected with control chip with the reception pin for the signal for receiving the control chip output, for the control chip being connected outputing signal to output pin, auxiliary pin, CAN high RST pin, division pin and the CAN low signal pin of the control chip.The auxiliary pin is grounded by the first resistor.The CAN high RST pin is connected by the second resistance with CAN and the division pin.The CAN low signal pin is connected by the 3rd resistor with the CAN and the division pin.The division pin also passes through first capacity earth.Above-mentioned CAN interface circuit components are few, simple in construction, PCB layout area is small and cost is low.
Description
【Technical field】
The present invention relates to automobile technical field, more particularly to a kind of CAN (Controller Area applied to automobile
Network, controller LAN) interface circuit.
【Background technology】
With continuing to develop for automobile industry, CAN (Controller Area Network, controller LAN) bus
It is widely used in the full-vehicle control of automobile, therefore, in automobile-used controller must generally possesses satisfactory CAN interface electricity
Road.
Existing CAN interface circuit, general using a CAN transceiver, CAN transceiver generally requires peripheral circuit to it
Various protection are carried out, such as：TVS protections, EMC protections etc., therefore, electronic component species needed for existing CAN interface circuit is more,
Area is big during complicated and PCB layout, so as to cause the overall cost of CAN interface circuit high.
In consideration of it, real be necessary to provide a kind of new CAN interface circuit to overcome disadvantages described above.
【The content of the invention】
Connect it is an object of the invention to provide the CAN that a kind of component is few, simple in construction, PCB layout area is small and cost is low
Mouth circuit.
To achieve these goals, the present invention provides a kind of CAN interface circuit, and the CAN interface circuit includes CAN interface
The electric capacity of chip, first to 3rd resistor and first, the CAN interface chip includes being used to be connected described to receive with control chip
The reception pin of the signal of control chip output, for being connected with the control chip to output signal to the control chip
Output pin, auxiliary pin, CAN high RST pin, division pin and CAN low signal pin, the auxiliary pin
It is grounded by the first resistor, the CAN high RST pin passes through the second resistance and CAN and the division
Pin is connected, and the CAN low signal pin passes through the 3rd resistor and the CAN and the division pin phase
Even, the division pin also passes through first capacity earth.
Further, the CAN interface circuit also includes the second electric capacity, and the CAN interface chip also includes power pins
And grounding pin, the power pins are connected with power supply, and pass through second capacity earth, the grounding pin ground connection.
Further, second electric capacity is filter capacitor.
Further, the first resistor is pull-up resistor.
Further, the second resistance and the 3rd resistor are terminal resistance.
Further, first electric capacity is end segment electric capacity.
Compared to prior art, the present invention is made by setting the CAN interface chip in the CAN interface circuit
The auxiliary pin of the CAN interface chip is grounded by the first resistor, and makes the CAN of the CAN interface chip high
Signal pins are connected by the second resistance with CAN and the division pin, also make the CAN of the CAN interface chip
Bus low signal pin is connected by the 3rd resistor with the CAN and the division pin, also makes the CAN interface
The division pin of chip is by first capacity earth, so that the CAN interface circuit only needs six components just can be with
The function of existing CAN interface circuit is realized, and then makes that the CAN interface circuit components are few, simple in construction, PCB layout face
Product is small and cost is low.
【Brief description of the drawings】
The circuit diagram for the CAN interface circuit that Fig. 1 provides for embodiments of the invention.
【Embodiment】
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that ordinary skill personage is obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
When an element was considered as with another element " being connected ", it can be directly to another element or
It may be simultaneously present centering elements.Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to this hair
The implication that the skilled worker of bright technical field is generally understood that is identical.Term used in the description of the invention herein
It is intended merely to describe the purpose of specific embodiment, it is not intended that in the limitation present invention.
Referring to Fig. 1, CAN (Controller Area Network, controller that Fig. 1 provides for embodiments of the invention
LAN) interface circuit 10 circuit diagram.The CAN interface circuit 10 includes CAN interface chip 12, first to 3rd resistor
R1-R3 and the first electric capacity C1.The CAN interface chip 12 includes being used to be connected to receive the control chip with control chip 15
The reception pin TXD of the signals of 15 outputs, for being connected with the control chip 15 to output signal to the control chip 15
Output pin RXD, auxiliary pin STBY, CAN high RST pin CANH, division pin SPLIT and CAN low signal
Pin CANL.The auxiliary pin STBY is grounded by the first resistor R1.The CAN high RST pin CANH passes through
The second resistance R2 is connected with CAN 16 and the division pin SPLIT.The CAN low signal pin CANL leads to
The 3rd resistor R3 is crossed with the CAN 16 and the division pin SPLIT to be connected.The division pin SPLIT also leads to
Cross the first electric capacity C1 ground connection.
The CAN interface circuit 10 also includes the second electric capacity C2.The CAN interface chip 12 also includes power pins VCC
And grounding pin GND.The power pins VCC is connected with power supply V1, and is grounded by the second electric capacity C2.The grounding lead
Pin GND is grounded.
In the present embodiment, the first resistor R1 is pull-up resistor, and the auxiliary pin STBY passes through described first
Resistance R1 is grounded, it is ensured that the CAN 16 is operated in fast state；The second resistance R2 and 3rd resistor R3
For terminal resistance, the first electric capacity C1 is end segment electric capacity, and the CAN high RST pin CANH passes through the second resistance
R2 is connected with the CAN 16, and the CAN low signal pin CANL is total by the 3rd resistor R3 and the CAN
Line 16 is connected, and the division pin SPLIT is connected with the CAN 16, and is grounded by the first electric capacity C1, is for institute
State CAN interface chip 12 by the CAN high RST pin CANH and CAN low signal pin CANL with it is described
CAN 16 provides reliable level when communicating, and is communicated so as to improve the CAN interface chip 12 with the CAN 16
When transmit signal quality；The second electric capacity C2 is filter capacitor, and the second electric capacity C2 filters out miscellaneous in the power supply V1
News, to be provided for the power pins VCC by reliable voltage.
The operation principle of the CAN interface circuit 10 provided embodiments of the invention is illustrated below.
During work, the voltage that the power supply V1 is provided is exported after being filtered through the second electric capacity C2 to be drawn to the power supply
Pin VCC.The CAN interface chip 12 receives the signal that the control chip 15 is exported by the reception pin TXD, and passes through
The output pin RXD outputs signal to the control chip 15, to be communicated with the control chip 15.The CAN connects
Mouth chip 12 passes through the CAN high RST pin CANH and CAN low signal pin CANL and the CAN
16 are communicated.
The present invention makes the CAN interface by setting the CAN interface chip 12 in the CAN interface circuit 10
The auxiliary pin STBY of chip 12 is grounded by the first resistor R1, and makes the CAN height letter of the CAN interface chip 12
Number pin CANH is connected by the second resistance R2 with CAN 16 and the division pin SPLIT, also connects the CAN
The CAN low signal pin CANL of mouth chip 12 is drawn by the 3rd resistor R3 with the CAN 16 and the division
Pin SPLIT is connected, and the division pin SPLIT of the CAN interface chip 12 is grounded by the first electric capacity C1, so that
10, CAN interface circuit need six component can just realize the function of existing CAN interface circuit, and then make described
The component of CAN interface circuit 10 is few, simple in construction, PCB layout area is small and cost is low.
The present invention is not restricted to described in specification and embodiment, therefore for the personage of familiar field
Additional advantage and modification is easily achieved, therefore in the essence of the universal limited without departing substantially from claim and equivalency range
In the case of refreshing and scope, the present invention is not limited to specific details, representational equipment and shown here as the diagram with description
Example.
Claims (6)
1. a kind of CAN interface circuit, it is characterised in that：The CAN interface circuit includes CAN interface chip, the first to the 3rd electricity
Resistance and the first electric capacity, the CAN interface chip include being used to be connected with control chip receiving the letter of the control chip output
Number reception pin, for being connected with the control chip with output signal to the control chip output pin, auxiliary draw
Pin, CAN high RST pin, division pin and CAN low signal pin, the auxiliary pin pass through the first resistor
Ground connection, the CAN high RST pin is connected by the second resistance with CAN and the division pin, the CAN
Bus low signal pin is connected by the 3rd resistor with the CAN and the division pin, and the division pin is also
Pass through first capacity earth.
2. CAN interface circuit as claimed in claim 1, it is characterised in that：The CAN interface circuit also includes the second electric capacity,
The CAN interface chip also includes power pins and grounding pin, and the power pins are connected with power supply, and pass through described second
Capacity earth, the grounding pin ground connection.
3. CAN interface circuit as claimed in claim 2, it is characterised in that：Second electric capacity is filter capacitor.
4. CAN interface circuit as claimed in claim 1, it is characterised in that：The first resistor is pull-up resistor.
5. CAN interface circuit as claimed in claim 1, it is characterised in that：The second resistance and the 3rd resistor is eventually
Hold resistance.
6. CAN interface circuit as claimed in claim 1, it is characterised in that：First electric capacity is end segment electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710469447.7A CN107239428A (en) | 2017-06-20 | 2017-06-20 | Can interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710469447.7A CN107239428A (en) | 2017-06-20 | 2017-06-20 | Can interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107239428A true CN107239428A (en) | 2017-10-10 |
Family
ID=59986523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710469447.7A Pending CN107239428A (en) | 2017-06-20 | 2017-06-20 | Can interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107239428A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110109390A (en) * | 2019-04-25 | 2019-08-09 | 深圳市宇明电子有限公司 | A kind of mould group can replace CAN chip |
| CN111791706A (en) * | 2020-06-30 | 2020-10-20 | 北京三邑科技有限公司 | Programmable vehicle-mounted CAN combined switch panel system and implementation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812743A (en) * | 2014-02-21 | 2014-05-21 | 合肥国轩高科动力能源股份公司 | CAN bus communication circuit |
| CN104102160A (en) * | 2014-07-24 | 2014-10-15 | 上海采埃孚转向***有限公司 | Controller area network (CAN) bus signal transceiving analysis tool |
| CN105711520A (en) * | 2016-04-27 | 2016-06-29 | 安徽江淮汽车股份有限公司 | Power management circuit of vehicle control unit and control method thereof |
| CN205706387U (en) * | 2016-04-29 | 2016-11-23 | 深圳市雪锐科技有限公司 | A kind of flashing light suggestion device |
| CN106499810A (en) * | 2016-10-18 | 2017-03-15 | 南京奥联汽车电子电器股份有限公司 | The circuit of the manual/automatic integratedization selector communicated based on CAN |
| CN206892859U (en) * | 2017-06-20 | 2018-01-16 | 江苏银基烯碳能源科技有限公司 | Can interface circuit |
-
2017
- 2017-06-20 CN CN201710469447.7A patent/CN107239428A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812743A (en) * | 2014-02-21 | 2014-05-21 | 合肥国轩高科动力能源股份公司 | CAN bus communication circuit |
| CN104102160A (en) * | 2014-07-24 | 2014-10-15 | 上海采埃孚转向***有限公司 | Controller area network (CAN) bus signal transceiving analysis tool |
| CN105711520A (en) * | 2016-04-27 | 2016-06-29 | 安徽江淮汽车股份有限公司 | Power management circuit of vehicle control unit and control method thereof |
| CN205706387U (en) * | 2016-04-29 | 2016-11-23 | 深圳市雪锐科技有限公司 | A kind of flashing light suggestion device |
| CN106499810A (en) * | 2016-10-18 | 2017-03-15 | 南京奥联汽车电子电器股份有限公司 | The circuit of the manual/automatic integratedization selector communicated based on CAN |
| CN206892859U (en) * | 2017-06-20 | 2018-01-16 | 江苏银基烯碳能源科技有限公司 | Can interface circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110109390A (en) * | 2019-04-25 | 2019-08-09 | 深圳市宇明电子有限公司 | A kind of mould group can replace CAN chip |
| CN110109390B (en) * | 2019-04-25 | 2022-02-18 | 深圳市宇明电子有限公司 | Module capable of replacing CAN chip |
| CN111791706A (en) * | 2020-06-30 | 2020-10-20 | 北京三邑科技有限公司 | Programmable vehicle-mounted CAN combined switch panel system and implementation method |
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