CN206892859U - Can interface circuit - Google Patents
Can interface circuit Download PDFInfo
- Publication number
- CN206892859U CN206892859U CN201720722976.9U CN201720722976U CN206892859U CN 206892859 U CN206892859 U CN 206892859U CN 201720722976 U CN201720722976 U CN 201720722976U CN 206892859 U CN206892859 U CN 206892859U
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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.)
- Expired - Fee Related
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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 for being connected with control chip to receive the receptions pin of the signal of control chip output, for the control chip being connected to output signal to the output pin of the control chip, aid in pin, CAN high RST pin, divide pin and CAN low signal pin.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】
It the utility model is related to automobile technical field, more particularly to a kind of CAN (Controller applied to automobile
Area Network, controller LAN) interface circuit.
【Background technology】
With the continuous development of 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, a CAN transceiver typically is used, 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 CAN interface circuit totality cost 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】
The purpose of this utility model is to provide that a kind of component is few, simple in construction, PCB layout area is small and cost is low
CAN interface circuit.
To achieve these goals, the utility model provides a kind of CAN interface circuit, and the CAN interface circuit includes CAN
The electric capacity of interface chip, first to 3rd resistor and first, the CAN interface chip include being used to be connected with control chip to receive
The reception pin of the signal of control chip output, for being connected with the control chip to output signal to the control core
Output pin, auxiliary pin, CAN high RST pin, division pin and the CAN low signal pin of piece, the auxiliary
Pin is grounded by the first resistor, and the CAN high RST pin passes through the second resistance and CAN and described
Division pin is connected, and the CAN low signal pin passes through the 3rd resistor and the CAN and the division pin
It is connected, 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 utility model by setting the CAN interface chip in the CAN interface circuit,
And the auxiliary pin of the CAN interface chip is grounded by the first resistor, and make the CAN of the CAN interface chip total
Line high RST pin is connected by the second resistance with CAN and the division pin, also makes the CAN interface chip
CAN low signal pin is connected by the 3rd resistor with the CAN and the division pin, also makes the CAN
The division pin of interface chip is by first capacity earth, so that the CAN interface circuit only needs six components just
The function of existing CAN interface circuit can be realized, and then makes that the CAN interface circuit components are few, simple in construction, PCB cloth
Line area is small and cost is low.
【Brief description of the drawings】
Fig. 1 is the circuit diagram for the CAN interface circuit that embodiment of the present utility model provides.
【Embodiment】
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, ordinary skill personage is not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
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 reality
The implication being generally understood that with the skilled worker of new technical field is identical.Made herein in specification of the present utility model
Term is intended merely to describe the purpose of specific embodiment, it is not intended that in limitation the utility model.
Referring to Fig. 1, CAN (Controller AreaNetwork, control that Fig. 1, which is embodiment of the present utility model, to be provided
Device LAN processed) interface circuit 10 circuit diagram.The CAN interface circuit 10 includes the electricity of CAN interface chip 12, first to the 3rd
Hinder R1-R3 and the first electric capacity C1.The CAN interface chip 12 includes being used to control chip 15 be connected to receive the control core
Piece 15 export signal reception pin TXD, 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 the low letter of CAN
Number pin CANL.The auxiliary pin STBY is grounded by the first resistor R1.The CAN high RST pin CANH leads to
The second resistance R2 is crossed with CAN 16 and the division pin SPLIT to be connected.The CAN low signal pin CANL
It is connected by the 3rd resistor R3 with the CAN 16 and the division pin SPLIT.The division pin SPLIT is also
It is grounded by the first electric capacity C1.
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 transmission 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 embodiment of the present utility model is illustrated below.
During work, the voltage of the power supply V1 offers exports after the second electric capacity C2 is filtered to be drawn to the power supply
Pin VCC.The CAN interface chip 12 receives the signal of the output of control chip 15 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 utility model makes the CAN by setting the CAN interface chip 12 in the CAN interface circuit 10
The auxiliary pin STBY of interface chip 12 is grounded by the first resistor R1, and makes the CAN of the CAN interface chip 12
High RST pin CANH is connected by the second resistance R2 with CAN 16 and the division pin SPLIT, is also made described
The CAN low signal pin CANL of CAN interface chip 12 passes through the 3rd resistor R3 and the CAN 16 and described point
Split pin SPLIT to be connected, the division pin SPLIT of the CAN interface chip 12 is grounded by the first electric capacity C1, from
And 10, the CAN interface circuit need six component can is realized the function of existing CAN interface circuit, and then make institute
State that the component of CAN interface circuit 10 is few, simple in construction, PCB layout area is small and cost is low.
The utility model is not restricted to described in specification and embodiment, therefore for the personage of familiar field
For additional advantage and modification is easily achieved, therefore in the universal limited without departing substantially from claim and equivalency range
Spirit and scope in the case of, the utility model is not limited to specific details, representational equipment and shown here as with retouching
The examples shown stated.
Claims (6)
- A kind of 1. 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 to receive the letter of the control chip output Number reception pin, for be connected with the control chip with output signal to the output pin of the control chip, 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 are 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 |
|---|---|---|---|
| CN201720722976.9U CN206892859U (en) | 2017-06-20 | 2017-06-20 | Can interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720722976.9U CN206892859U (en) | 2017-06-20 | 2017-06-20 | Can interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206892859U true CN206892859U (en) | 2018-01-16 |
Family
ID=61315774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720722976.9U Expired - Fee Related CN206892859U (en) | 2017-06-20 | 2017-06-20 | Can interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206892859U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107239428A (en) * | 2017-06-20 | 2017-10-10 | 江苏银基烯碳能源科技有限公司 | Can interface circuit |
| WO2020135261A1 (en) * | 2018-12-29 | 2020-07-02 | 南京懂玫驱动技术有限公司 | Can bus communication circuit for use in electric bicycle |
-
2017
- 2017-06-20 CN CN201720722976.9U patent/CN206892859U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107239428A (en) * | 2017-06-20 | 2017-10-10 | 江苏银基烯碳能源科技有限公司 | Can interface circuit |
| WO2020135261A1 (en) * | 2018-12-29 | 2020-07-02 | 南京懂玫驱动技术有限公司 | Can bus communication circuit for use in electric bicycle |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180116 Termination date: 20200620 |