CN214851274U - CAN bus communication circuit and CAN bus communication device - Google Patents
CAN bus communication circuit and CAN bus communication device Download PDFInfo
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- CN214851274U CN214851274U CN202120403504.3U CN202120403504U CN214851274U CN 214851274 U CN214851274 U CN 214851274U CN 202120403504 U CN202120403504 U CN 202120403504U CN 214851274 U CN214851274 U CN 214851274U
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Abstract
The utility model provides a CAN bus communication circuit, which comprises a control circuit module, a level conversion module, a first switch module, a second switch module, a first transceiver, a second transceiver and a CAN controller; the micro control unit is used for sending a first control signal or a second control signal according to the equipment nodes accessed to the first connecting end and the second connecting end; when the micro control unit sends out a first control signal, the CAN controller is connected with the equipment node through the first transceiver; and when the micro control unit sends out a second control signal, the CAN controller is connected with the equipment node through the second transceiver. The utility model also provides a CAN bus communication device. The utility model provides a CAN bus communication circuit and CAN bus communication device has realized the nonpolarity communication of CAN bus, and equipment node need not to distinguish the polarity of bus when connecting the CAN network, has improved engineering installation and debugging efficiency, has reduced follow-up network maintenance cost.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to the field of communication technology, especially, relate to a CAN bus communication circuit and CAN bus communication device.
[ background of the invention ]
The CAN is an abbreviation of Controller Area Network (Controller Area Network), and a device communication node on a CAN bus is fixedly configured with a transceiving I/O (input/output) port when accessing the CAN Network, so that when the device node is connected to the CAN Network, the polarity of the bus must be correctly distinguished, and then the device communication node is connected according to a correct wiring sequence, so that normal communication of the CAN Network CAN be ensured. In addition, in some distributed control systems with long communication distance, many nodes and complex network, the engineering installation and debugging of the equipment nodes are very troublesome and the efficiency is low.
In view of the above, it is desirable to provide a new CAN bus communication circuit and a new CAN bus communication apparatus to overcome the above-mentioned drawbacks.
[ Utility model ] content
The utility model aims at providing a CAN bus communication circuit and CAN bus communication device has realized the nonpolarity communication of CAN bus, and equipment node need not to distinguish the polarity of bus when connecting the CAN network, has improved engineering installation and debugging efficiency, has reduced follow-up network maintenance cost.
In order to achieve the above object, in a first aspect, the present invention provides a CAN bus communication circuit, including a control circuit module, a level conversion module, a first switch module, a second switch module, a first transceiver, a second transceiver, and a CAN controller; the first end of the control circuit module is connected with the micro control unit, the second end of the control circuit module is connected with the first end of the first switch module, the second end of the first switch module is connected with a power supply, and the third end of the first switch module is connected with a first power supply pin of the first transceiver; the first end of the level conversion module is connected with the micro control unit, the second end of the level conversion module is connected with the first end of the second switch module, the second end of the second switch module is connected with the power supply, and the third end of the second switch module is connected with the second power supply pin of the second transceiver; a control transmitting pin of the CAN controller is connected with a first transmitting pin of the first transceiver and a second transmitting pin of the second transceiver, and a control receiving pin of the CAN controller is connected with a first receiving pin of the first transceiver and a second receiving pin of the second transceiver; a first high-level pin of the first transceiver is connected with a second low-level pin of the second transceiver, and a first connection end is led out; the first low-level pin of the second transceiver is connected with the second high-level pin of the second transceiver, and a second connecting end is led out; the micro control unit is used for sending a first control signal or a second control signal according to the equipment nodes accessed to the first connecting end and the second connecting end; when the micro control unit sends a first control signal, the first switch module is switched on, the first transceiver works, the second switch module is switched off, the second transceiver does not work, and the CAN controller is connected with the equipment node through the first transceiver; when the micro control unit sends a second control signal, the first switch module is turned off, the first transceiver does not work, the second switch module is turned on, the second transceiver works, and the CAN controller is connected with the equipment node through the second transceiver.
In a preferred embodiment, the control circuit module includes an NPN-type triode, a base of the NPN-type triode is connected to the micro control unit through a first resistor, an emitter of the NPN-type triode is grounded, and a collector of the NPN-type triode is connected to the first switching module through a second resistor; and the collector of the NPN type triode is also connected with the power supply through a third resistor.
In a preferred embodiment, the level shift module includes an N-type MOS transistor, a gate of the N-type MOS transistor is connected to a system power supply, a source of the N-type MOS transistor is connected to the micro control unit, a fourth resistor is connected between the gate and the source of the N-type MOS transistor, and a drain of the N-type MOS transistor is connected to the second switch module; and the drain electrode of the N-type MOS tube is also connected with the power supply through a fifth resistor.
In a preferred embodiment, the first switch module includes a first P-type MOS transistor, a gate of the first P-type MOS transistor leads out a first end of the first switch module, a source of the first P-type MOS transistor leads out a second end of the first switch module, and a drain of the first P-type MOS transistor leads out a third end of the first switch module.
In a preferred embodiment, the second switch module includes a second P-type MOS transistor, a gate of the second P-type MOS transistor leads out a first end of the second switch module, a source of the second P-type MOS transistor leads out a second end of the second switch module, and a drain of the second P-type MOS transistor leads out a third end of the second switch module; and the grid electrode of the second P-type MOS tube is connected with the level conversion module through a sixth resistor.
In a preferred embodiment, the voltage of the power supply is 5V and the voltage of the system power supply is 3.3V.
In a preferred embodiment, a control power pin of the CAN controller is connected to the system power supply.
In a preferred embodiment, the first data power pin of the first transceiver and the second data power pin of the second transceiver are both connected to the system power supply.
In a preferred embodiment, the first control signal is a high level signal, and the second control signal is a low level signal.
In a second aspect, the present invention further provides a CAN bus communication device, which includes any one of the above-mentioned CAN bus communication circuits.
Compared with the prior art, the utility model provides a CAN bus communication circuit and CAN bus communication device, connect first switch module through the control circuit module, first transceiver is reconnected to first switch module, level conversion module connects second switch module, second transceiver is reconnected to second switch module, and, first transceiver and second transceiver are connected to the CAN controller, the second low level pin of second transceiver is connected to the first high level pin of first transceiver, the second low level pin of second transceiver is connected to the first low level pin of first transceiver, realized sending first control signal when little the control unit, the CAN controller passes through first transceiver and equipment node communication, send second control signal when little the control unit, the CAN controller pass through the second transceiver with equipment node communication. Therefore, when the equipment node is connected to the CAN bus, the CAN bus is switched in polarity, namely non-polarity communication of the CAN bus is realized, the equipment node does not need to distinguish the polarity of the bus when being connected with the CAN network, the engineering installation and debugging efficiency is improved, and the subsequent network maintenance cost is reduced.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic block diagram of a CAN bus communication circuit provided by the present invention;
fig. 2 is a circuit diagram of a control circuit module of the CAN bus communication circuit provided by the present invention;
fig. 3 is a circuit diagram of a level conversion module of the CAN bus communication circuit provided by the present invention;
fig. 4 is a partial circuit diagram of the CAN bus communication circuit provided by the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a CAN bus communication circuit 100, which includes a control circuit module 10, a level shift module 20, a first switch module 30, a second switch module 40, a first transceiver U1, a second transceiver U2 and a CAN controller U3.
The first end of the control circuit module 10 is connected to the micro control unit 101, the second end of the control circuit module 10 is connected to the first end of the first switch module 30, the second end of the first switch module 30 is connected to the power supply VCC5V, and the third end of the first switch module 30 is connected to the first power supply pin VCC1 of the first transceiver U1. The first terminal of the level shift module 20 is connected to the mcu 101, the second terminal of the level shift module 20 is connected to the first terminal of the second switch module 40, the second terminal of the second switch module 40 is connected to the VCC5V, and the third terminal of the second switch module 40 is connected to the VCC2 of the second transceiver U2.
A control transmission pin TXCAN of the CAN controller U3 is connected to a first transmission pin TXD1 of the first transceiver U1 and a second transmission pin TXD2 of the second transceiver U2, and a control reception pin RXCAN of the CAN controller U3 is connected to a first reception pin RXD1 of the first transceiver U1 and a second reception pin RXD2 of the second transceiver U2. The first high-level pin CANH1 of the first transceiver U1 is connected to the second low-level pin CANL2 of the second transceiver U2, and a first connection terminal C1 is led out. The first low pin CANL1 of the first transceiver U1 is connected to the second high pin CANH2 of the second transceiver U2, and a second connection C2 is led out.
Further, the mcu 101 is configured to send a first control signal or a second control signal according to the device node connected to the first connection terminal C1 and the second connection terminal C2; when the micro control unit 101 sends out a first control signal, the first switch module 30 is turned on, the first transceiver U1 is operated, the second switch module 40 is turned off, the second transceiver U2 is not operated, and the CAN controller U3 is connected to and communicates with the equipment node through the first transceiver U1; when the mcu 101 sends the second control signal, the first switch module 30 is turned off, the first transceiver U1 is not operated, the second switch module 40 is turned on, the second transceiver U2 is operated, and the CAN controller U3 is connected to and communicates with the device node through the second transceiver U2. In this embodiment, the first control signal is a high level signal, and the second control signal is a low level signal.
It CAN be understood that when the first connection end C1 and the second connection end C2 are connected to the device node, if the high level end of the device node is connected to the first connection end C1 and the low level end of the device node is connected to the second connection end C2, the mcu 101 sends a first control signal, and the CAN controller U3 communicates with the device node through the first transceiver U1; if the low level end of the equipment node is connected with the first connection end C1 and the high level end is connected with the second connection end C2, the micro control unit 101 sends out a second control signal, and the CAN controller U3 communicates with the equipment node through the second transceiver U2. Therefore, when the equipment node is connected to the CAN bus, the CAN bus performs polarity switching, and non-polarity communication of the CAN bus is also realized. Specifically, the micro control unit 101 is an mcu (microcontroller unit).
Therefore, the CAN bus communication circuit provided by the present invention connects the first switch module 30 through the control circuit module 10, the first switch module 30 connects to the first transceiver U1, the level shift module 20 connects to the second switch module 40, the second switch module 40 connects to the second transceiver U2, moreover, the CAN controller U3 is connected to the first transceiver U1 and the second transceiver U2, the first high level pin CANH1 of the first transceiver U1 is connected to the second low level pin CANL2 of the second transceiver U2, the first low level pin CANL1 of the first transceiver U1 is connected to the second high level pin CANL2 of the second transceiver U2, so that when the micro control unit 101 sends out a first control signal, the CAN controller U3 communicates with the device node through the first transceiver U1, when the mcu 101 sends a second control signal, the CAN controller U3 communicates with the device node via the second transceiver U2. Therefore, when the equipment node is connected to the CAN bus, the CAN bus is switched in polarity, namely non-polarity communication of the CAN bus is realized, the equipment node does not need to distinguish the polarity of the bus when being connected with the CAN network, the engineering installation and debugging efficiency is improved, and the subsequent network maintenance cost is reduced.
Referring to fig. 2, the control circuit module 10 includes an NPN transistor Q10, a base of the NPN transistor Q10 is connected to the micro control unit 101 through a first resistor R1, that is, one end of the first resistor R1 not connected to the NPN transistor Q10 is led out of the first end of the control circuit module 10, an emitter of the NPN transistor Q10 is grounded, and a collector of the NPN transistor Q10 is connected to the first switch module 30 through a second resistor R2, that is, one end of the second resistor R2 not connected to the NPN transistor Q10 is led out of the second end of the control circuit module 10. Specifically, the collector of the NPN transistor Q10 is further connected to the power supply VCC5V through a third resistor R3. In this embodiment, the first resistor R1, the second resistor R2, and the third resistor R3 have a size of 10K ohms, and the voltage of the power supply is 5V.
Referring to fig. 3, the level shift module 20 includes an N-type MOS transistor Q20, a gate of the N-type MOS transistor Q20 is connected to the system power VCC3.3V, a source of the N-type MOS transistor Q20 is connected to the micro control unit 101, i.e., the source of the N-type MOS transistor Q20 leads out the first end of the level shift module 20, a fourth resistor R4 is connected between the gate and the source of the N-type MOS transistor Q20, and a drain of the N-type MOS transistor Q20 is connected to the second switch module 40, i.e., the drain of the N-type MOS transistor Q20 leads out the second end of the level shift module 20. Specifically, the drain of the N-type MOS transistor Q20 is further connected to the power supply VCC5V through a fifth resistor R5. In this embodiment, the size of the fourth resistor R4 and the fifth resistor R5 is 10K ohms, and the voltage of the system power supply is 3.3V.
Referring to fig. 4, the first switch module 30 includes a first P-type MOS transistor Q1, a gate of the first P-type MOS transistor Q1 leads out a first end of the first switch module 30, a source of the first P-type MOS transistor Q1 leads out a second end of the first switch module 30, and a drain of the first P-type MOS transistor Q1 leads out a third end of the first switch module 30. The second switch module 40 comprises a second P-type MOS transistor Q2, a gate of the second P-type MOS transistor Q2 leads out a first end of the second switch module 40, a source of the second P-type MOS transistor Q2 leads out a second end of the second switch module 40, and a drain of the second P-type MOS transistor Q2 leads out a third end of the second switch module 40. Specifically, the gate of the second P-type MOS transistor Q2 is connected to the level shifter module 20 through the sixth resistor R6.
Further, a control power pin VDD of the CAN controller U3 is connected to a system power supply VCC3.3V, and the system power supply VCC3.3V is used for supplying power to the CAN controller U3. The first data power pin VIO1 of the first transceiver U1 and the second data power pin VIO2 of the second transceiver U2 are both connected to a system power supply VCC3.3V, and the system power supply VCC3.3V is used to supply power to the first transceiver U1 and the second transceiver U2.
The utility model provides a CAN bus communication circuit 100's principle as follows:
when the first connection terminal C1 and the second connection terminal C2 are connected to the device node, the mcu 101 sends a high level signal or a low level signal according to the polarity of the connected device node.
When the micro control unit 101 sends a high level signal, the collector of the NPN triode Q10 outputs a low level, the first P-type MOS transistor Q1 is turned on, the first power pin VCC1 of the first transceiver U1 obtains a 5V working voltage, the first transceiver U1 works, the N-type MOS transistor Q20 is turned off, the second P-type MOS transistor Q2 is turned off, the second power pin VCC2 of the second transceiver U2 does not obtain a 5V working voltage, the second transceiver U2 does not work, the CAN controller U3 is connected to the device node through the first transceiver U1 and communicates with the device node, at this time, the first connection end C1 is a high level end, and the second connection end C2 is a low level end.
When the micro control unit 101 sends a low level signal, the collector of the NPN triode Q10 outputs a high level, the first P-type MOS transistor Q1 is turned off, the first power pin VCC1 of the first transceiver U1 does not obtain a 5V working voltage, the first transceiver U1 does not operate, the N-type MOS transistor Q20 is turned on, the second P-type MOS transistor Q2 is turned on, the second power pin VCC2 of the second transceiver U2 obtains a 5V working voltage, the second transceiver U2 operates, the CAN controller U3 is connected to the device node through the second transceiver U2 and communicates with the device node, at this time, the first connection terminal C1 is a low level terminal, and the second connection terminal C2 is a high level terminal.
The utility model also provides a CAN bus communication device, including above-mentioned any one embodiment CAN bus communication circuit 100. It should be noted that the utility model provides a CAN bus communication circuit 100's all embodiments all are applicable to the utility model provides a CAN bus communication device, and the homoenergetic CAN reach the same or similar beneficial effect.
In summary, the present invention provides a CAN bus communication circuit 100 and a CAN bus communication device, the first switch module 30 is connected through the control circuit module 10, the first switch module 30 is further connected with the first transceiver U1, the level shift module 20 is connected with the second switch module 40, the second switch module 40 is further connected with the second transceiver U2, moreover, the CAN controller U3 is connected to the first transceiver U1 and the second transceiver U2, the first high level pin CANH1 of the first transceiver U1 is connected to the second low level pin CANL2 of the second transceiver U2, the first low level pin CANL1 of the first transceiver U1 is connected to the second high level pin CANL2 of the second transceiver U2, so that when the micro control unit 101 sends out a first control signal, the CAN controller U3 communicates with the device node through the first transceiver U1, when the mcu 101 sends a second control signal, the CAN controller U3 communicates with the device node via the second transceiver U2. Therefore, when the equipment node is connected to the CAN bus, the CAN bus is switched in polarity, namely non-polarity communication of the CAN bus is realized, the equipment node does not need to distinguish the polarity of the bus when being connected with the CAN network, the engineering installation and debugging efficiency is improved, and the subsequent network maintenance cost is reduced.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A CAN bus communication circuit is characterized by comprising a control circuit module, a level conversion module, a first switch module, a second switch module, a first transceiver, a second transceiver and a CAN controller;
the first end of the control circuit module is connected with the micro control unit, the second end of the control circuit module is connected with the first end of the first switch module, the second end of the first switch module is connected with a power supply, and the third end of the first switch module is connected with a first power supply pin of the first transceiver; the first end of the level conversion module is connected with the micro control unit, the second end of the level conversion module is connected with the first end of the second switch module, the second end of the second switch module is connected with the power supply, and the third end of the second switch module is connected with the second power supply pin of the second transceiver;
a control transmitting pin of the CAN controller is connected with a first transmitting pin of the first transceiver and a second transmitting pin of the second transceiver, and a control receiving pin of the CAN controller is connected with a first receiving pin of the first transceiver and a second receiving pin of the second transceiver; a first high-level pin of the first transceiver is connected with a second low-level pin of the second transceiver, and a first connection end is led out; the first low-level pin of the second transceiver is connected with the second high-level pin of the second transceiver, and a second connecting end is led out;
the micro control unit is used for sending a first control signal or a second control signal according to the equipment nodes accessed to the first connecting end and the second connecting end; when the micro control unit sends a first control signal, the first switch module is switched on, the first transceiver works, the second switch module is switched off, the second transceiver does not work, and the CAN controller is connected with the equipment node through the first transceiver; when the micro control unit sends a second control signal, the first switch module is turned off, the first transceiver does not work, the second switch module is turned on, the second transceiver works, and the CAN controller is connected with the equipment node through the second transceiver.
2. The CAN bus communication circuit of claim 1, wherein the control circuit module comprises an NPN transistor, a base of the NPN transistor is connected to the micro control unit through a first resistor, an emitter of the NPN transistor is grounded, and a collector of the NPN transistor is connected to the first switching module through a second resistor; and the collector of the NPN type triode is also connected with the power supply through a third resistor.
3. The CAN bus communication circuit of claim 1, wherein the level shift module comprises an N-type MOS transistor, a gate of the N-type MOS transistor is connected to a system power supply, a source of the N-type MOS transistor is connected to the micro control unit, a fourth resistor is connected between the gate and the source of the N-type MOS transistor, and a drain of the N-type MOS transistor is connected to the second switch module; and the drain electrode of the N-type MOS tube is also connected with the power supply through a fifth resistor.
4. The CAN bus communication circuit of claim 1, wherein the first switch module comprises a first P-type MOS transistor, a gate of the first P-type MOS transistor leads out a first end of the first switch module, a source of the first P-type MOS transistor leads out a second end of the first switch module, and a drain of the first P-type MOS transistor leads out a third end of the first switch module.
5. The CAN bus communication circuit of claim 1, wherein the second switch module comprises a second P-type MOS transistor, a gate of the second P-type MOS transistor leads out a first end of the second switch module, a source of the second P-type MOS transistor leads out a second end of the second switch module, and a drain of the second P-type MOS transistor leads out a third end of the second switch module; and the grid electrode of the second P-type MOS tube is connected with the level conversion module through a sixth resistor.
6. The CAN bus communication circuit of claim 3, wherein the voltage of the power supply is 5V and the voltage of the system power supply is 3.3V.
7. The CAN bus communication circuit of claim 3 wherein a control power pin of the CAN controller is connected to the system power supply.
8. The CAN bus communication circuit of claim 3, wherein the first data power pin of the first transceiver and the second data power pin of the second transceiver are both connected to the system power supply.
9. The CAN bus communication circuit of claim 1, wherein the first control signal is a high level signal and the second control signal is a low level signal.
10. A CAN-bus communication device comprising the CAN-bus communication circuit according to any one of claims 1 to 9.
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| CN202120403504.3U CN214851274U (en) | 2021-02-24 | 2021-02-24 | CAN bus communication circuit and CAN bus communication device |
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| CN202120403504.3U CN214851274U (en) | 2021-02-24 | 2021-02-24 | CAN bus communication circuit and CAN bus communication device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054867A (en) * | 2023-02-02 | 2023-05-02 | 上海拿森汽车电子有限公司 | CAN transceiver circuit, communication device and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054867A (en) * | 2023-02-02 | 2023-05-02 | 上海拿森汽车电子有限公司 | CAN transceiver circuit, communication device and vehicle |
| CN116054867B (en) * | 2023-02-02 | 2024-07-30 | 上海拿森汽车电子有限公司 | CAN transceiver circuit, communication device and vehicle |
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