CN112433501A - Isolated RS-485, I2C and CAN communication module - Google Patents
Isolated RS-485, I2C and CAN communication module Download PDFInfo
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- CN112433501A CN112433501A CN202011480246.5A CN202011480246A CN112433501A CN 112433501 A CN112433501 A CN 112433501A CN 202011480246 A CN202011480246 A CN 202011480246A CN 112433501 A CN112433501 A CN 112433501A
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- 238000004891 communication Methods 0.000 title claims abstract description 46
- 238000002955 isolation Methods 0.000 abstract description 11
- 230000001052 transient effect Effects 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005457 optimization Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000036039 immunity Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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Abstract
An isolated RS-485, I2C and CAN communication module, in particular to isolation protection of RS-485, I2C and CAN communication interfaces. The device comprises a microcontroller module, a voltage regulator module, an isolated DC/DC module, an RS-485 transceiver module, an I2C transceiver module and a CAN transceiver module. The invention uses the isolation DC/DC power supply to provide power supply isolation for the communication link, uses the isolation RS-485, I2C and CAN communication ports to prevent spike voltage and ground loop in noise environment, and has high reliability and stability in industrial environment.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an isolated RS-485, I2C and CAN communication module.
Technical Field
With the rapid development of automatic control technology, various industrial control systems are more and more complicated, intelligent and networked at present, the information transmission quantity is larger and larger, and various data communication bus protocols such as RS-485, I2C and CAN are rapidly developed and applied in order to meet the communication and control requirements of various control systems. RS-485 adopts two-wire differential balanced transmission technology, and has the advantages of simple structure, strong interference resistance and the like. I2C is a simple and effective bidirectional two-wire synchronous serial bus. The CAN bus protocol adopts many new technologies, and compared with a general communication bus, the data communication of the CAN bus protocol has outstanding reliability, instantaneity and flexibility.
In a complex and severe industrial environment, a bus communication technology is required to perform efficient management, preventive maintenance and fault diagnosis on a control system, and an isolated communication module is important to the reliability of the control system, so that the method has very important practical significance for the reliable isolation performance of the communication module and the research on high immunity and high efficiency in the severe environment.
Disclosure of Invention
The invention aims to provide an isolated RS-485, I2C and CAN communication module, which provides an isolated interface at a communication port, prevents spike voltage and ground loop in a noise environment and ensures reliable data transmission performance in a complex environment.
The purpose of the invention is realized by the following technical scheme: an isolated RS-485, I2C and CAN communication module comprises a microcontroller module, a voltage regulator module, an isolated DC/DC module, an RS-485 transceiver module, an I2C transceiver module, and a CAN transceiver module; the output of the voltage regulator module is connected with the microcontroller; the input of the isolated DC/DC module is connected with the output of the voltage regulator; the output of the isolated DC/DC module is connected with the inputs of the RS-485, I2C and the CAN transceiver; the communication end of the RS-485 transceiver module is connected with the microcontroller; the I2C transceiver module communication end is connected with the microcontroller; the communication end of the CAN transceiver module is connected with the microcontroller; the bus end of the RS-485 transceiver module is connected with an RS-485 bus; the bus end of the I2C transceiver module is connected with the I2C bus; the CAN transceiver module bus end is connected with the CAN bus.
As a further optimization of the invention, the microcontroller adopts TMS320F28035 which supports three communication peripherals of RS-485, I2C and CAN and has a rapid data processing capability.
As a further optimization of the invention, the voltage regulator adopts a TPS767301 chip with ultra-low quiescent current and good low power consumption characteristics.
As a further optimization of the invention, the isolated DC/DC module adopts a push-pull SN6505B chip with low noise and low EMI.
As a further optimization of the invention, the RS-485 transceiver adopts an ISO3082 chip which can reach 2500VRMS and has a current isolation lasting for 60 seconds, a TVS diode is added to a peripheral bus circuit of the chip to guide instantaneous energy to the ground and far away from the transceiver, a pulse resistance is added to avoid overvoltage, a transient blocking unit TBU is added to limit current, a metal oxide varistor MOV is added to clamp transient voltage to hundreds of volts, and the transient current is clamped to below 1 milliampere.
As a further optimization of the invention, the I2C transceiver adopts a low-power consumption bidirectional isolator ISO1541 which can block high voltage, isolate grounding and prevent noise and current interference.
As a further optimization of the invention, the CAN transceiver adopts a digital isolator ISO1050 with thermal cut-off, under-voltage lockout and fault protection, short-circuit current limitation, and a TVS diode is added to a chip peripheral bus circuit to serve as a clamping circuit, so that instantaneous energy is guided to the ground and away from the transceiver.
The invention has the beneficial effects that: the isolation type DC/DC power supply, the RS-485 and I2C, the CAN transceiver and the peripheral circuit thereof are adopted, the 4000VPK, 2500VRES and 560VPK functional isolation and 50KV/us common mode transient immunity are met, the power supply with the efficiency of more than 87% is adopted to supply power to the isolation side circuit, the influence of noise and electromagnetic interference on a communication module in industrial occasions CAN be effectively reduced, and the isolation performance and the data transmission stability of the communication module are improved.
Drawings
FIG. 1 is a schematic structural diagram of an isolated RS-485, I2C and CAN communication module according to the present invention.
FIG. 2 is a circuit diagram of a voltage regulator of the isolated RS-485, I2C and CAN communication modules of the present invention.
FIG. 3 is a circuit diagram of an isolated DC/DC power supply of the isolated RS-485, I2C and CAN communication modules of the present invention.
FIG. 4 is a circuit diagram of an RS-485 transceiver of an isolated RS-485, I2C and CAN communication module of the present invention.
FIG. 5 is a circuit diagram of an I2C transceiver of an isolated RS-485, I2C and CAN communication module of the present invention.
FIG. 6 is a circuit diagram of a CAN transceiver of the present invention with isolated RS-485, I2C and CAN communication modules.
Detailed Description
The embodiment is described with reference to fig. 1 to 6, and the isolated RS-485, I2C and CAN communication module in the embodiment includes a microcontroller module, a voltage regulator module, an isolated DC/DC module, an RS-485 transceiver module, an I2C transceiver module, and a CAN transceiver module; the output of the voltage regulator module is connected with the microcontroller; the input of the isolated DC/DC module is connected with the output of the voltage regulator; the output of the isolated DC/DC module is connected with the inputs of the RS-485, I2C and the CAN transceiver; the communication end of the RS-485 transceiver module is connected with the microcontroller; the I2C transceiver module communication end is connected with the microcontroller; the communication end of the CAN transceiver module is connected with the microcontroller; the bus end of the RS-485 transceiver module is connected with an RS-485 bus; the bus end of the I2C transceiver module is connected with the I2C bus; the CAN transceiver module bus end is connected with the CAN bus.
The input of the voltage regulator TPS767D301 is 5V, the enable terminals EN1 and EN2 are kept at low level at the input terminal, and the output voltage is stabilized at 3.3V and 1.9V by the reference voltage, the error amplifier and the voltage comparator network inside the voltage regulator.
The isolation type DC/DC push-pull transformer driver SN6505B drives the input voltage to 5V direct current voltage through a center tap transformer, and realizes ultra-low noise and EMI through internally controlling the output switching frequency and spread spectrum clock.
The isolated half-duplex differential line transceiver ISO3082 input front end clamps the transient voltage below the pulse voltage through a metal oxide varistor MOV. When the transient current exceeds the current limiting value of the transient blocking unit TBU, the TBU can limit the current flowing to the transceiver, the TVS diode guides the transient energy to the ground to avoid the transient energy from damaging equipment, and the pulse-proof resistor serves as a current limiter to limit the line current.
The input of the bidirectional isolator ISO1541 transmits data through a serial data line SDA and a serial clock line SCL, and an input-output buffer integrated in the transceiver can block high voltage, isolate grounding and prevent noise current from entering a control end circuit to damage a sensitive circuit.
The input of the isolated CAN transceiver ISO1050 is differential signal lines CANH and CANL, and the differential signal of the differential signal lines is converted into a logic level signal through an internal transceiver to carry out data communication. The transceiver has a thermal shutdown function, and when the temperature of the transceiver exceeds a thermal shutdown threshold, the device shuts down the signal lines and the driving circuit on the bus transmission path. When the internal power supply is under-voltage, the transceiver is disabled to protect the bus, and data transmission errors caused by unstable power supply are prevented.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides an isolated RS-485, I2C and CAN communication module, characterized by: the device comprises a microcontroller module, a voltage regulator module, an isolated DC/DC module, an RS-485 transceiver module, an I2C transceiver module and a CAN transceiver module; the output of the voltage regulator module is connected with the microcontroller; the input of the isolated DC/DC module is connected with the output of the voltage regulator; the output of the isolated DC/DC module is connected with the inputs of the RS-485, I2C and the CAN transceiver; the communication end of the RS-485 transceiver module is connected with the microcontroller; the I2C transceiver module communication end is connected with the microcontroller; the communication end of the CAN transceiver module is connected with the microcontroller; the bus end of the RS-485 transceiver module is connected with an RS-485 bus; the bus end of the I2C transceiver module is connected with the I2C bus; the CAN transceiver module bus end is connected with the CAN bus.
2. The isolated RS-485, I2C and CAN communication module of claim 1, wherein: the microcontroller adopts TMS320F 28035.
3. The isolated RS-485, I2C and CAN communication module of claim 1, wherein: the voltage regulator adopts TPS767D 301.
4. The isolated RS-485, I2C and CAN communication module of claim 1, wherein: the input of the voltage regulator is direct current 5V.
5. The isolated RS-485, I2C and CAN communication module of claim 1, wherein: the isolated DC/DC module adopts SN 6505B.
6. The isolated RS-485, I2C and CAN communication module of claim 1, wherein: the CAN transceiver adopts ISO 1050.
7. The isolated RS-485, I2C and CAN communication module of claim 1, wherein: the RS-485 transceiver adopts ISO 3082.
8. The isolated RS-485, I2C and CAN communication module of claim 1, wherein: the I2C transceiver adopts ISO 1541.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011480246.5A CN112433501A (en) | 2020-12-16 | 2020-12-16 | Isolated RS-485, I2C and CAN communication module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011480246.5A CN112433501A (en) | 2020-12-16 | 2020-12-16 | Isolated RS-485, I2C and CAN communication module |
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| CN112433501A true CN112433501A (en) | 2021-03-02 |
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| CN202011480246.5A Pending CN112433501A (en) | 2020-12-16 | 2020-12-16 | Isolated RS-485, I2C and CAN communication module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783584A (en) * | 2021-11-11 | 2021-12-10 | 汇智机器人科技(深圳)有限公司 | Isolated single-wire serial communication device and method |
Citations (8)
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|---|---|---|---|---|
| CN202841176U (en) * | 2012-08-31 | 2013-03-27 | 广州致远电子股份有限公司 | Embedded isolation RS-485 transceiver module |
| CN203324979U (en) * | 2013-02-22 | 2013-12-04 | 广州致远电子股份有限公司 | Embedded isolating CAN-bus transceiver module |
| CN203732908U (en) * | 2014-03-03 | 2014-07-23 | 上海邦伯现代农业技术有限公司 | Universal monitor module for agriculture |
| CN206003088U (en) * | 2016-07-20 | 2017-03-08 | 蚌埠学院 | The multi-bus interface circuit of magnetostrictive displacement sensor |
| CN106713097A (en) * | 2017-02-08 | 2017-05-24 | 广州致远电子股份有限公司 | CAN transmitting-receiving module |
| CN209327889U (en) * | 2019-02-28 | 2019-08-30 | 南京信息工程大学 | 4-20mA programme control precision current source |
| CN209462398U (en) * | 2019-01-28 | 2019-10-01 | 深圳市壹厘米科技有限公司 | The two-way mutual biography device of repeating transmission can be isolated with 485 buses for a kind of CAN bus |
| CN213659213U (en) * | 2020-12-16 | 2021-07-09 | 哈尔滨理工大学 | Isolated RS-485, I2C and CAN communication module |
-
2020
- 2020-12-16 CN CN202011480246.5A patent/CN112433501A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202841176U (en) * | 2012-08-31 | 2013-03-27 | 广州致远电子股份有限公司 | Embedded isolation RS-485 transceiver module |
| CN203324979U (en) * | 2013-02-22 | 2013-12-04 | 广州致远电子股份有限公司 | Embedded isolating CAN-bus transceiver module |
| CN203732908U (en) * | 2014-03-03 | 2014-07-23 | 上海邦伯现代农业技术有限公司 | Universal monitor module for agriculture |
| CN206003088U (en) * | 2016-07-20 | 2017-03-08 | 蚌埠学院 | The multi-bus interface circuit of magnetostrictive displacement sensor |
| CN106713097A (en) * | 2017-02-08 | 2017-05-24 | 广州致远电子股份有限公司 | CAN transmitting-receiving module |
| CN209462398U (en) * | 2019-01-28 | 2019-10-01 | 深圳市壹厘米科技有限公司 | The two-way mutual biography device of repeating transmission can be isolated with 485 buses for a kind of CAN bus |
| CN209327889U (en) * | 2019-02-28 | 2019-08-30 | 南京信息工程大学 | 4-20mA programme control precision current source |
| CN213659213U (en) * | 2020-12-16 | 2021-07-09 | 哈尔滨理工大学 | Isolated RS-485, I2C and CAN communication module |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783584A (en) * | 2021-11-11 | 2021-12-10 | 汇智机器人科技(深圳)有限公司 | Isolated single-wire serial communication device and method |
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