CN203840364U - CAN bus isolation circuit based on ISO1050 - Google Patents
CAN bus isolation circuit based on ISO1050 Download PDFInfo
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- CN203840364U CN203840364U CN201420149817.0U CN201420149817U CN203840364U CN 203840364 U CN203840364 U CN 203840364U CN 201420149817 U CN201420149817 U CN 201420149817U CN 203840364 U CN203840364 U CN 203840364U
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Abstract
The utility model belongs to the communication technology field, especially relates to a CAN bus isolation circuit based on ISO1050. The CAN bus isolation circuit based on the ISO1050 can be used to solve the problems of the conventional CAN bus circuits of the prior art that the anti-interference capabilities are weak, the error reports occur easily when being disturbed, and the service lifetime is short. The CAN bus isolation circuit comprises an ISO1050 chip, and a VCC1pin of the ISO1050 chip is connected with a 3.3V power supply. A CAN-RX pin and a CAN-TX pin of the ISO 1050chip are respectively connected with a first capacitor (C413) and a second capacitor (C425). A VCC2 pin of the ISO1050 chip is parallely connected with a third capacitor (C414) and a fourth capacitor (E401), and a parallel connection end of the third capacitor (C414) and a parallel connection end of the fourth capacitor (E401) are connected with an independent 5V power supply. The CAN bus isolation circuit based on the ISO1050 is advantageous in that the interferences of the signals and the voltages can be prevented, and the service lifetime of the CAN bus can be prolonged.
Description
Technical field
The utility model belongs to communication technique field, especially relates to a kind of CAN bus isolation circuit based on ISO1050.
Background technology
The high-performance of CAN bussing technique and reliability are admitted, and are widely used in the aspects such as industrial automation, boats and ships, Medical Devices, industrial equipment.Fieldbus is one of focus of nowadays automatic art development, is described as the LAN (Local Area Network) of automatic field.It appear as that dcs realizes between each node in real time, data communication reliably provides strong technical support.So using on the product of CAN communication, abnormal if CAN communication occurs, will on using, cause product a lot of inconvenience.It is poor that in prior art, CAN bus isolation circuit is deposited the antijamming capability of circuit, and in the time that externally fed voltage is interfered, CAN communication chip there will be the situations such as operation irregularity, and sometimes deviation appears in benchmark, and CAN communication is easy to report an error; For this reason, people have carried out long-term exploration, have proposed various solutions.
For example, Chinese patent literature discloses a kind of CAN communicating circuit [application number: 201220582118.6], comprise CAN controller and CAN isolation transceiver, wherein CAN controller is connected to one end of CAN isolation transceiver by serial data output line and serial data input line, and the CAN isolation transceiver other end connects CAN communication physical bus.CAN isolation transceiver is connected to physical bus by two bus ends with differential sending and receiving function.A bus two ends build-out resistor in parallel, antijamming capability and reliability while improving transfer of data.In host computer, develop CAN communication interface, the information of control system is shown in CAN communication interface.The advantage of this utility model is that the communication distance of system is far away, radio frequency interference is low, good stability.
Although above-mentioned scheme has improved CAN bus isolation circuit performance to a certain extent, this scheme CAN bus circuit poor anti jamming capability, can be easy to while being interfered report an error, and causes causing inconvenience in permanent use procedure.
Utility model content
The purpose of this utility model is for the problems referred to above, provides a kind of design more rationally and the more practical CAN bus isolation circuit based on ISO1050.
For achieving the above object, the utility model has adopted following technical proposal: this CAN bus isolation circuit based on ISO1050 comprises ISO1050 chip, the VCC1 pin of described ISO1050 chip is connected with 3.3V power supply, the CAN-RX pin of ISO1050 chip is connected with the second electric capacity with the first electric capacity respectively with CAN-TX pin, and the first electric capacity and the second electric capacity are all connected on the first grounding pin of ISO1050 chip, the 3rd electric capacity in parallel and the 4th electric capacity on the VCC2 pin of described ISO1050 chip, and parallel connected end of the 3rd electric capacity and the 4th electric capacity is connected with independent 5V power supply, another parallel connected end is connected with the second grounding pin of ISO1050 chip, the CANH pin of described ISO1050 chip and CANL pin access respectively the first transient voltage twin zener dioder and the second transient voltage twin zener dioder.
In the above-mentioned CAN bus isolation circuit based on ISO1050, one utmost point of the first described transient voltage twin zener dioder is parallel with the 5th electric capacity being connected on CANH pin, one utmost point of the second described transient voltage twin zener dioder is parallel with the 6th electric capacity being connected on CANL pin, described the first transient voltage twin zener dioder, the second transient voltage twin zener dioder, the 5th electric capacity and the equal ground connection of the 6th electric capacity, be connected with the first resistance between described CANH pin and CANL pin.
In the above-mentioned CAN bus isolation circuit based on ISO1050, on described CAN-RX pin, be serially connected with the second resistance, described CAN-TX pin is serially connected with the 3rd resistance, is serially connected with the 4th resistance on described CANH pin, is serially connected with the 5th resistance on described CANL pin.
Compared with prior art, the advantage of this CAN bus isolation circuit based on ISO1050 is: 1, use CAN isolating chip ISO1050, and adopt independent 5V Power supply, avoided to a great extent the interference problem such as signal and voltage; 2, add separately transient voltage twin zener dioder at CANH and CANL two ends, protected well the normal operation of CAN communication, thereby extended the useful life of CAN bus isolation circuit.
Brief description of the drawings
Fig. 1 is the frame structure schematic diagram that the utility model provides.
In figure, 3.3V power supply 1, independent 5V power supply 2, the first capacitor C 413, the second capacitor C 425, the 3rd capacitor C 414, the 4th electric capacity E401, the 5th capacitor C 426, the 6th capacitor C 427, the first transient voltage twin zener dioder ZD401, the second transient voltage twin zener dioder ZD402, the first grounding pin GND1, the second grounding pin GND2, the first resistance R 449, the second resistance R 445, the 3rd resistance R 446, the 4th resistance R 447, the 5th resistance R 448.
Embodiment
As shown in Figure 1, this CAN bus isolation circuit based on ISO1050 comprises ISO1050 chip, the VCC1 pin of described ISO1050 chip is connected with 3.3V1 power supply, the CAN-RX pin of ISO1050 chip is connected with the second capacitor C 425 with the first capacitor C 413 respectively with CAN-TX pin, and the first capacitor C 413 and the second capacitor C 425 are all connected on the first grounding pin GND1 of ISO1050 chip, the 3rd capacitor C 414 in parallel and the 4th electric capacity E401 on the VCC2 pin of described ISO1050 chip, and parallel connected end of the 3rd capacitor C 414 and the 4th electric capacity E401 is connected with independent 5V power supply 2, another parallel connected end is connected with the second grounding pin GND2 of ISO1050 chip, the CANH pin of described ISO1050 chip and CANL pin access respectively the first transient voltage twin zener dioder ZD401 and the second transient voltage twin zener dioder ZD402, the use of isolating chip ISO1050 and independent 5V power supply 2, has avoided the interference problem such as signal and voltage to a great extent, and not only practical but also long service life meets the needs of modern social development.
Concrete, in the present embodiment, a utmost point of the first described transient voltage twin zener dioder ZD401 is parallel with the 5th capacitor C 426 being connected on CANH pin, a utmost point of the second described transient voltage twin zener dioder ZD402 is parallel with the 6th capacitor C 427 being connected on CANL pin, the first described transient voltage twin zener dioder ZD401, the second transient voltage twin zener dioder ZD402, the 5th capacitor C 426 and the equal ground connection of the 6th capacitor C 427, between described CANH pin and CANL pin, be connected with the first resistance R 449, the normal operation of CAN communication has well been protected in the use of the first transient voltage twin zener dioder ZD401 and the second transient voltage twin zener dioder ZD402, it is more reasonable to design.
Further, on CAN-RX pin described in the present embodiment, be serially connected with the second resistance R 445, described CAN-TX pin is serially connected with the 3rd resistance R 446, is serially connected with the 4th resistance R 447 on described CANH pin, is serially connected with the 5th resistance R 448 on described CANL pin.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendments or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although more used the terms such as 3.3V power supply 1, independent 5V power supply 2, the first capacitor C 413, the second capacitor C 425, the 3rd capacitor C 414, the 4th electric capacity E401, the 5th capacitor C 426, the 6th capacitor C 427, the first transient voltage twin zener dioder ZD401, the second transient voltage twin zener dioder ZD402, the first grounding pin GND1, the second grounding pin GND2, the first resistance R 449, the second resistance R 445, the 3rd resistance R 446, the 4th resistance R 447, the 5th resistance R 448 herein, do not got rid of the possibility that uses other term.Use these terms to be only used to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.
Claims (3)
1. the CAN bus isolation circuit based on ISO1050 chip, it is characterized in that, this circuit comprises ISO1050 chip, the VCC1 pin of described ISO1050 chip is connected with 3.3V power supply (1), the CAN-RX pin of ISO1050 chip is connected with the second electric capacity (C425) with the first electric capacity (C413) respectively with CAN-TX pin, and the first electric capacity (C413) and the second electric capacity (C425) are all connected on first grounding pin (GND1) of ISO1050 chip, the 3rd electric capacity (C414) in parallel and the 4th electric capacity (E401) on the VCC2 pin of described ISO1050 chip, and parallel connected end of the 3rd electric capacity (C414) and the 4th electric capacity (E401) is connected with independent 5V power supply (2), another parallel connected end is connected with second grounding pin (GND2) of ISO1050 chip, the CANH pin of described ISO1050 chip and CANL pin access respectively the first transient voltage twin zener dioder (ZD401) and the second transient voltage twin zener dioder (ZD402).
2. the CAN bus isolation circuit based on ISO1050 chip according to claim 1, it is characterized in that, one utmost point of the first described transient voltage twin zener dioder (ZD401) is parallel with the 5th electric capacity (C426) being connected on CANH pin, one utmost point of the second described transient voltage twin zener dioder (ZD402) is parallel with the 6th electric capacity (C427) being connected on CANL pin, the first described transient voltage twin zener dioder (ZD401), the second transient voltage twin zener dioder (ZD402), the 5th electric capacity (C426) and the 6th electric capacity (C427) is ground connection all, between described CANH pin and CANL pin, be connected with the first resistance (R449).
3. the CAN bus isolation circuit based on ISO1050 chip according to claim 1, it is characterized in that, on described CAN-RX pin, be serially connected with the second resistance (R445), described CAN-TX pin is serially connected with the 3rd resistance (R446), on described CANH pin, be serially connected with the 4th resistance (R447), on described CANL pin, be serially connected with the 5th resistance (R448).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420149817.0U CN203840364U (en) | 2014-03-30 | 2014-03-30 | CAN bus isolation circuit based on ISO1050 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420149817.0U CN203840364U (en) | 2014-03-30 | 2014-03-30 | CAN bus isolation circuit based on ISO1050 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203840364U true CN203840364U (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420149817.0U Expired - Fee Related CN203840364U (en) | 2014-03-30 | 2014-03-30 | CAN bus isolation circuit based on ISO1050 |
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| CN (1) | CN203840364U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460466A (en) * | 2014-12-25 | 2015-03-25 | 李钢 | CAN isolating circuit |
| CN106789516A (en) * | 2017-01-06 | 2017-05-31 | 四川埃姆克伺服科技有限公司 | A kind of CAN and 422/485 common interface circuit |
| CN112637375A (en) * | 2020-12-16 | 2021-04-09 | 安徽阿瑞特汽车电子科技有限公司 | CAN bus equipment address setting circuit |
-
2014
- 2014-03-30 CN CN201420149817.0U patent/CN203840364U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460466A (en) * | 2014-12-25 | 2015-03-25 | 李钢 | CAN isolating circuit |
| CN104460466B (en) * | 2014-12-25 | 2017-07-04 | 李钢 | A kind of CAN isolation circuits |
| CN106789516A (en) * | 2017-01-06 | 2017-05-31 | 四川埃姆克伺服科技有限公司 | A kind of CAN and 422/485 common interface circuit |
| CN112637375A (en) * | 2020-12-16 | 2021-04-09 | 安徽阿瑞特汽车电子科技有限公司 | CAN bus equipment address setting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20140917 Termination date: 20160330 |