CN213069543U

CN213069543U - Circuit and device for controller area network communication

Info

Publication number: CN213069543U
Application number: CN202021816628.6U
Authority: CN
Inventors: 刘鹏飞; 刘晓红; 邓家勇; 吴壬华
Original assignee: Shenzhen Shinry Technologies Co Ltd
Current assignee: Shenzhen Shinry Technologies Co Ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-04-27
Anticipated expiration: 2030-08-26

Abstract

The embodiment of the utility model discloses circuit and device of controller area network communication, this circuit include first communication unit, second communication unit and connect first communication unit with logic circuit between the second communication unit, first communication unit's feed end with the feed end of second communication unit connects, first communication unit's earthing terminal with the earthing terminal connecting ground line of second communication unit, first communication unit's earthing terminal with the earthing terminal of second communication unit is the same ground level, first communication unit's sending terminal with the sending terminal of second communication unit is connected logic circuit's input, first communication unit's receiving terminal with the receiving terminal of second communication unit is connected logic circuit's output. Implement the embodiment of the utility model provides a, can realize that no transceiver hypoplastron in or a plurality of communication unit in the piece adopt the same ground level's controller local area network to communicate.

Description

Circuit and device for controller area network communication

Technical Field

The utility model relates to an electronic circuit technical field, concretely relates to circuit and device of controller local area network communication.

Background

A Controller Area Network (CAN) bus is a multi-master bus, and in the CAN bus, each communication node may include a Micro Control Unit (MCU), a CAN Controller, and a CAN transceiver, that is, each communication node may be a host, and the communication nodes may also transmit and receive signals of other communication nodes on the bus through the CAN transceiver for communication.

Due to the advantages of CAN communication, CAN communication CAN utilize the advantages of CAN communication in some on-board communication or on-chip communication, but because each communication node is additionally provided with a CAN transceiver, the hardware cost is greatly increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a circuit and device of controller area network communication can realize that no transceiver hypoplastron or a plurality of little the control unit in the piece adopt the same ground level's controller area network to communicate, have practiced thrift the hardware cost greatly.

The embodiment of the utility model provides a first aspect provides a circuit of controller area network communication for a plurality of communication units in inboard or the piece adopt the same ground level's controller area network to communicate, including first communication unit, second communication unit and connection first communication unit with logic circuit between the second communication unit, wherein:

the power supply end of the first communication unit and the power supply end of the second communication unit are connected with a power supply, the grounding end of the first communication unit and the grounding end of the second communication unit are connected with a ground wire, the grounding end of the first communication unit and the grounding end of the second communication unit are at the same ground level, the transmitting end of the first communication unit and the transmitting end of the second communication unit are connected with the input end of the logic circuit, and the receiving end of the first communication unit and the receiving end of the second communication unit are connected with the output end of the logic circuit;

the controller area network signal is received and sent by the first communication unit and the second communication unit and is transmitted and processed by the logic circuit;

when the transmitting end of the first communication unit and/or the transmitting end of the second communication unit are at a low level, the receiving end of the first communication unit and the receiving end of the second communication unit are both at a low level; when the transmitting end of the first communication unit and the transmitting end of the second communication unit are both at high level, the receiving end of the first communication unit and the receiving end of the second communication unit are both at high level.

In one embodiment, the first communication unit comprises M micro control units, where M is a natural number greater than 1, where:

the M micro control units include, but are not limited to, a first micro control unit and a second micro control unit;

the power supply end of the first micro control unit and the power supply end of the second micro control unit are connected with a power supply, the grounding end of the first micro control unit and the grounding end of the second micro control unit are connected with a ground wire, the grounding end of the first micro control unit and the grounding end of the second micro control unit are at the same ground level, the transmitting end of the first micro control unit and the transmitting end of the second micro control unit are connected with the input end of the logic circuit, and the receiving end of the first micro control unit and the receiving end of the second micro control unit are connected with the output end of the logic circuit;

the first micro control unit and the second micro control unit are used for receiving and transmitting controller local area network signals.

In one embodiment, the second communication unit comprises N micro control units, where N is a natural number greater than 0, where:

the N micro control units include, but are not limited to, a third micro control unit;

the power supply end of the third micro control unit is connected with a power supply, the grounding end of the third micro control unit is connected with a ground wire, the grounding end of the third micro control unit, the grounding end of the first micro control unit and the grounding end of the second micro control unit are at the same ground level, the sending end of the third micro control unit is connected with the input end of the logic circuit, and the receiving end of the third micro control unit is connected with the output end of the logic circuit;

the third micro control unit is used for receiving and transmitting a controller local area network signal.

In one embodiment, the logic circuit is an and logic gate circuit including, but not limited to, an and logic gate, wherein:

the power supply end of the AND logic gate is connected with a power supply, the grounding end of the AND logic gate is connected with a ground wire, the first input end of the AND logic gate is connected with the sending end of the first micro control unit, the second input end of the AND logic gate is connected with the sending end of the second micro control unit, the third input end of the AND logic gate is connected with the sending end of the third micro control unit, and the output end of the AND logic gate is connected with the receiving end of the first micro control unit, the receiving end of the second micro control unit and the receiving end of the third micro control unit;

the AND logic gate is used for transmitting and processing the controller area network signals.

In one embodiment, the circuit for controller area network communication further comprises a filter circuit connected between the output of the and logic gate and the receiving terminals of the first, second, and third micro control units.

In one embodiment, the filter circuit comprises a first capacitor and a first resistor, wherein:

the output end of the logic gate is connected with the first end of the first resistor, the first end of the first capacitor is connected with a ground wire, and the second end of the first resistor is connected with the second end of the first capacitor, the receiving end of the first micro-control unit, the receiving end of the second micro-control unit and the receiving end of the third micro-control unit.

In one embodiment, the power supply comprises a first auxiliary power supply and a second auxiliary power supply, a first output end of the first auxiliary power supply is connected with a power supply end of the first micro control unit, a second output end of the first auxiliary power supply is connected with a power supply end of the second micro control unit, a third output end of the first auxiliary power supply is connected with a power supply end of the third micro control unit, and an output end of the second auxiliary power supply is connected with a power supply end of the logic gate.

In one embodiment, the communication medium of the bus of the controller area network communication circuit is twisted pair, coaxial cable, or fiber optic.

In one embodiment, the and logic gate is a complementary metal oxide semiconductor and logic gate.

The embodiment of the utility model provides a second aspect provides a device of controller area network communication, include the power with any embodiment in the first aspect the circuit of controller area network communication, the power does first communication unit the second communication unit with logic circuit supplies power.

In an embodiment of the present invention, a circuit of controller area network communication is provided, include first communication unit, second communication unit and connect first communication unit with logic circuit between the second communication unit, wherein:

Implement the embodiment of the utility model provides a, can realize not having the transceiver hypoplastron in or a plurality of little the control unit in the piece adopt the same ground level's controller local area network to communicate, practiced thrift the hardware cost greatly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a circuit for communicating with a controller area network having a plurality of micro control units in a lower board or in a chip of a transceiver using the same ground level according to the conventional method;

fig. 2 is a schematic structural diagram of a circuit for controller area network communication according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second circuit for controller area network communication according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a third circuit for controller area network communication according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a fourth circuit for controller area network communication according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fifth circuit for controller area network communication according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a sixth circuit for controller area network communication according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a device for controller area network communication according to an embodiment of the present invention.

Detailed Description

The technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiment of the utility model provides a circuit and device of controller area network communication, the following detailed description.

The embodiment of the present invention relates to a "first communication unit" and a "second communication unit" which may be any two functional units connected through a CAN bus.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a circuit structure of a conventional method in which a plurality of micro control units in a lower board or a chip of a transceiver communicate using a controller area network of the same ground level. As shown in fig. 1, the controller area network communication circuit described in this embodiment is two structural modes commonly existing in the current circuit, in the structural mode one, the micro control unit MCU is connected to the CAN controller, the CAN controller is connected to the CAN transceiver, the CAN transceiver is connected to the bus of the controller area network communication circuit, the control signal is transmitted between the micro control unit MCU and the CAN controller, the CAN signal is transmitted between the CAN controller and the CAN transceiver, and the CAN transceiver receives and transmits the CAN signal through the bus of the controller area network communication circuit, so that the CAN communication of the plurality of micro control units in the board or the chip at the same level of ground level is realized; in the second structure mode, the micro control unit MCU includes a CAN controller therein, the micro control unit MCU is connected with the CAN transceiver, the CAN transceiver is connected with the bus of the circuit for the controller area network communication, the CAN signal is transmitted between the micro control unit MCU and the CAN transceiver, the CAN transceiver receives and transmits the CAN signal through the bus of the circuit for the controller area network communication, and the CAN communication of the plurality of micro control units in the board or the chip at the same level is realized.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a circuit for controller area network communication according to an embodiment of the present invention. As shown in fig. 2, the circuit for controller area network communication described in the present embodiment includes a first communication unit 10, a second communication unit 20, and a logic circuit 30 connected between the first communication unit 10 and the second communication unit 20, wherein:

the power supply terminal 11 of the first communication unit 10 and the power supply terminal 21 of the second communication unit 20 are connected to a power supply, the ground terminal 14 of the first communication unit 10 and the ground terminal 24 of the second communication unit 20 are connected to a ground, the ground terminal 14 of the first communication unit 10 and the ground terminal 24 of the second communication unit 20 are at the same ground level, the transmitting terminal 12 of the first communication unit 10 is connected to the input terminal 33 of the logic circuit 30, the transmitting terminal 22 of the second communication unit 20 is connected to the input terminal 32 of the logic circuit 30, and the receiving terminal 13 of the first communication unit 10 and the receiving terminal 23 of the second communication unit 20 are connected to the output terminal 31 of the logic circuit 30;

the first communication unit 10 and the second communication unit 20 are configured to receive and transmit CAN signals, the logic circuit 30 is configured to transmit and process CAN signals, the controller area network communication circuit is configured to enable a plurality of communication units in a board or in a chip to use CAN communication with the same ground level, if any one or more of the transmitting end 12 of the first communication unit 10 and the transmitting end 22 of the second communication unit 20 is/are at a low level, the receiving end 13 of the first communication unit 10 and the receiving end 23 of the second communication unit 20 are both at a low level, and if the transmitting end 12 of the first communication unit 10 and the transmitting end 22 of the second communication unit 20 are both at a high level, the receiving end 13 of the first communication unit 10 and the receiving end 23 of the second communication unit 20 are both at a high level, which is specifically shown in table 1 below:

TABLE 1

Transmitting end 12 of first communication unit 10	The transmitting end 22 of the second communications unit 20	Receiving end 13 and receiving end 23
			Low level of electricity	Low level of electricity	Low level of electricity
Low level of electricity	High level	Low level of electricity
			High level	Low level of electricity	Low level of electricity
High level	High level	High level

Referring to fig. 3, fig. 3 is a schematic structural diagram of a second controller area network communication circuit according to an embodiment of the present invention. The first communication unit 10 described in this embodiment includes M micro control units MCUs, where M is a natural number greater than 1; in the present embodiment, M is 2, but in other embodiments, the value of M is not particularly limited as long as the limitation is satisfied. As shown in fig. 3, the MCU includes a first MCU1 and a second MCU 2;

the power supply end 111 of the MCU1 and the power supply end 211 of the MCU2 are connected with a power supply, the ground end 114 of the MCU1 and the ground end 214 of the MCU2 are connected with a ground wire, the ground end 114 of the MCU1 and the ground end 214 of the MCU2 are at the same ground level, the transmitting end 112 of the MCU1 is connected with the input end 34 of the logic circuit 30, the transmitting end 212 of the MCU2 is connected with the input end 33 of the logic circuit 30, and the receiving end 113 of the MCU1 and the receiving end 213 of the MCU2 are connected with the output end 31 of;

the MCU1 and the MCU2 are configured to receive and transmit CAN signals, the transmitting end 112 of the MCU1 and the transmitting end 212 of the MCU2 respectively transmit CAN signals, and the CAN signals respectively flow to the input end 34 and the input end 33 of the logic circuit 30 through lines, the logic circuit 30 processes the received CAN signals, and outputs the obtained signal streams from the output end 31 of the logic circuit 30 to the receiving end 113 of the MCU1 and the receiving end 213 of the MCU2, respectively, so that the MCU1 and the MCU2 in the lower board or in the chip without the transceiver CAN communicate with the controller area network of the same ground level.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a third circuit for controller area network communication according to an embodiment of the present invention. The second communication unit 20 described in this embodiment includes N micro control units MCUs, where N is a natural number greater than 0; in the present embodiment, N is 1, and in other embodiments, the value of N is not specifically limited as long as the limitation is satisfied. As shown in fig. 4, the second communication unit 20 includes a third micro control unit MCU 3;

the power supply end 311 of the MCU3 is connected to a power supply, the ground end 314 of the MCU3 is connected to a ground, the ground end 314 of the MCU3, the ground end 114 of the MCU1, and the ground end 214 of the MCU2 are at the same ground level, the transmitting end 312 of the MCU3 is connected to the input end 32 of the logic circuit 30, and the receiving end 313 of the MCU3 is connected to the output end 31 of the logic circuit 30;

the MCU3 is configured to receive and transmit CAN signals, the transmitting end 312 of the MCU3 transmits CAN signals, the CAN signals flow to the input end 32 of the logic circuit 30 through a line, the logic circuit 30 processes the CAN signals received by the input ports, and outputs the obtained signal streams from the output end 31 of the logic circuit 30 to be transmitted to the receiving end 113 of the MCU1, the receiving end 213 of the MCU2, and the receiving end 313 of the MCU3, respectively, so that the MCU1, the MCU2, and the MCU3 in the lower board or the chip without a transceiver CAN communicate with the controller area network at the same level.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a fourth controller area network communication circuit according to an embodiment of the present invention. As shown in fig. 5, the logic circuit 30 described in the present embodiment is an and logic gate circuit, which includes, but is not limited to, an and logic gate 401;

a power supply is connected with the power supply end 411 of the logic gate 401, a ground line is connected with the ground end 413 of the logic gate 401, the transmitting end 112 of the MCU1 is connected with the first input end 416 of the logic gate 401, the transmitting end 212 of the MCU2 is connected with the second input end 415 of the logic gate 401, the transmitting end 312 of the MCU3 is connected with the third input end 414 of the logic gate 401, and the receiving end 113 of the MCU1, the receiving end 213 of the MCU2 and the receiving end 313 of the MCU3 are connected with the output end 412 of the logic gate 401;

the and logic gate 401 is a Complementary Metal Oxide Semiconductor and logic gate (CMOS), and the CMOS has the advantages of simple manufacturing process, low power consumption, high integration level, wide power supply voltage application range, strong anti-interference capability, stable and reliable operation, and the switching speed is much higher than that of other logic gate circuits;

and logic gate 401 is used to transmit and process CAN signals. Signals are transmitted from the transmitting end 112 of the MCU1, the transmitting end 212 of the MCU2, and the transmitting end 312 of the MCU3, and respectively enter the first input end 416, the second input end 415, and the third input end 414 of the and logic gate 401, and perform logic processing on all received signal levels, and output the obtained result signals through the output end 412, and respectively transmit the result signals to the receiving end 113 of the MCU1, the receiving end 213 of the MCU2, and the receiving end 313 of the MCU3, so as to complete the CAN communication in which a plurality of micro control units in the lower board or the chip of the transceiver adopt the same ground level, where the specific conditions of the signal processing are shown in table 2 below:

TABLE 2

Please refer to fig. 6, fig. 6 is a schematic structural diagram of a fifth circuit for controller area network communication according to an embodiment of the present invention. As shown in fig. 6, the circuit for controller area network communication described in this embodiment further includes a filter circuit 40, the filter circuit 40 is connected between the output terminal 412 of the and logic gate 401 and the receiving terminal 113 of the MCU1, the receiving terminal 213 of the MCU2, and the receiving terminal 313 of the MCU 3;

the CAN signal stream output from the output terminal 412 of the logic gate 401 flows into the filter circuit 40, and is filtered and then transmitted to the receiving terminal 113 of the MCU1, the receiving terminal 213 of the MCU2, and the receiving terminal 313 of the MCU3, so that the CAN signal stream during communication is more stable and fidelity, and the communication efficiency is higher.

Alternatively, the filter circuit 40 may be connected in other ways than as shown in fig. 6. Specifically, in the above-described circuit for controller area network communication depicted in fig. 6, after flowing out from the output end 412 of the and logic gate 401, the CAN signal stream is respectively shunted to the receiving end 113 of the MCU1, the receiving end 213 of the MCU2, and the receiving end 313 of the MCU3, and three filter circuits, namely, a first filter circuit, a second filter circuit, and a third filter circuit, may be respectively disposed on three branches of the shunted CAN signal. The internal structures of the first filter circuit, the second filter circuit, and the third filter circuit are the same as those of the filter circuit 40.

At this time, the CAN signal stream output by the output end 412 of the and logic gate 401 flows into the first filter circuit after being shunted, and is transmitted to the receiving end 113 of the MCU1 after being filtered; the CAN signal stream output by the output end 412 of the and logic gate 401 flows into the second filter circuit after being shunted, and is transmitted to the receiving end 213 of the MCU2 after being filtered; the CAN signal stream output by the output end 412 of the and logic gate 401 flows into the third filter circuit after being shunted, and is transmitted to the receiving end 313 of the MCU3 after being filtered. The connection mode of the first filter circuit, the second filter circuit and the third filter circuit CAN enable CAN signal flow in the communication process to be more stable and fidelity, and the communication efficiency is higher.

Alternatively, other connection methods may be used in addition to the connection method of the filter circuit 40, the connection method of the first filter circuit, the second filter circuit, and the third filter circuit shown in fig. 6. Specifically, in the circuit for controller area network communication described in fig. 6, a fourth filter circuit may be connected between the first input terminal 416 of the logic gate 401 and the transmitting terminal 112 of the first MCU1, a fifth filter circuit may be connected between the second input terminal 415 of the logic gate 401 and the transmitting terminal 212 of the second MCU2, and a sixth filter circuit may be connected between the third input terminal 414 of the logic gate 401 and the transmitting terminal 312 of the third MCU 3. The internal structures of the fourth filter circuit, the fifth filter circuit, and the sixth filter circuit are the same as those of the first filter circuit 40.

At this time, the CAN signal stream sent by the sending end 112 of the first MCU1 flows into the fourth filter circuit, is filtered and then transmitted to the first input end 416 of the and logic gate 401, the CAN signal stream sent by the sending end 212 of the second MCU2 flows into the fifth filter circuit, is filtered and then transmitted to the second input end 415 of the and logic gate 401, and the CAN signal stream sent by the sending end 312 of the third MCU3 flows into the sixth filter circuit, is filtered and then transmitted to the third input end 414 of the and logic gate 401. The connection mode of the fourth filter circuit, the fifth filter circuit and the sixth filter circuit CAN enable CAN signal flow in the communication process to be more stable and fidelity, and the communication efficiency is higher.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a sixth controller area network communication circuit according to an embodiment of the present invention. As shown in fig. 7, the filter circuit 40 described in the present embodiment includes a first capacitor C1 and a first resistor R1;

the first end 511 of the first resistor R1 is connected with the output end 412 of the logic gate 401, the first end 514 of the first capacitor C1 is connected with the ground, and the second end 512 of the first resistor R1 is connected with the second end 513 of the first capacitor C1, the receiving end 113 of the MCU1, the receiving end 213 of the MCU2 and the receiving end 313 of the MCU 3;

the output end 412 of the and logic gate 401 outputs a CAN signal, the CAN signal flows out from the second end 512 of the first resistor R1 after passing through the first resistor R1, the CAN signal is grounded after being shunted and respectively passing through the first capacitor C1, and the other part of the shunted CAN signal is shunted to the receiving end 113 of the MCU1, the receiving end 213 of the MCU2 and the receiving end 313 of the MCU 3; the rectified voltage output from the output terminal 412 of the and logic gate 401 passes through the RC filter circuit formed by the first resistor R1 and the first capacitor C1, and has a good filtering effect on low-frequency ac interference, and as described in the whole, the filter circuit 40 is used for reducing the ac component in the pulsating dc voltage, and retaining the dc component, so that the output voltage has a reduced ripple coefficient and a smooth waveform.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a controller area network communication device according to an embodiment of the present invention. As shown in fig. 8, the power supply described in this embodiment includes a first auxiliary power supply 601 and a second auxiliary power supply 602, a first output end 611 of the first auxiliary power supply 601 is connected to the power supply end 111 of the MCU1, a second output end 612 of the first auxiliary power supply 601 is connected to the power supply end 211 of the MCU2, a third output end 613 of the first auxiliary power supply 601 is connected to the power supply end 311 of the MCU3, and an output end 614 of the second auxiliary power supply 602 is connected to the power supply end 411 of the logic gate 401, wherein the first auxiliary power supply 601 and the second auxiliary power supply 602 are not part of a circuit for controller area network communication, but are part of a device for controller area network communication, the device further includes a circuit for controller area network communication and a bus for connecting the circuit, the communication medium of the bus is twisted pair, coaxial cable or optical fiber, and the twisted pair has strong anti-interference capability and long transmission distance, The optical fiber transmits signals in the form of optical pulses, so that the optical fiber is not interfered by external electromagnetic signals, the attenuation speed of the signals is very low, the coaxial cable is a cable with a central copper conductor wrapped by layers of insulating wires, and the coaxial cable has the advantages of strong anti-interference capability, stable transmission data, low price and the like, and the three communication media are widely used to meet the requirements of the device on a circuit bus.

The circuit and the device for the controller area network communication provided by the embodiment of the present invention are introduced in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A circuit for communication of a controller area network, which is used for a plurality of communication units in a board or a chip to communicate by using the controller area network with the same ground level, is characterized by comprising:

a first communication unit, a second communication unit, and a logic circuit connected between the first communication unit and the second communication unit;

2. The circuit of controller area network communication of claim 1, wherein the first communication unit comprises:

m micro control units, wherein M is a natural number greater than 1;

3. The circuit of claim 2, wherein the second communication unit comprises:

n micro control units, wherein N is a natural number greater than 0;

4. The circuit of claim 3, wherein the logic circuit is an AND logic gate circuit, and the AND logic gate circuit includes but is not limited to an AND logic gate;

5. The circuit of claim 4, further comprising a filter circuit coupled between the output of the AND logic gate and the receiving terminals of the first, second, and third micro control units.

6. The circuit of controller area network communication of claim 5, wherein the filtering circuit comprises a first capacitor and a first resistor;

7. The circuit of claim 6, wherein the power supply comprises a first auxiliary power supply and a second auxiliary power supply, a first output terminal of the first auxiliary power supply is connected to the power supply terminal of the first micro-control unit, a second output terminal of the first auxiliary power supply is connected to the power supply terminal of the second micro-control unit, a third output terminal of the first auxiliary power supply is connected to the power supply terminal of the third micro-control unit, and an output terminal of the second auxiliary power supply is connected to the power supply terminal of the and logic gate.

8. The circuit of claim 4, wherein the AND logic gate is a CMOS AND logic gate.

9. A device for controller area network communication, comprising a power supply and the circuit for controller area network communication of any one of claims 1 to 8, wherein the power supply supplies power to the first communication unit, the second communication unit and the logic circuit in the circuit for controller area network communication.