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CAN and 485 are commonly used field buses in industrial communications. Isolation and protection of communication buses is an important prerequisite for product reliability and stability. So how to protect the communication bus? There are many isolation solutions, how to choose the right one? This article will answer you!
1. Why should the communication bus be isolated?
Currently, most products have external communication parts: MCU+ transceiver +external bus , and most commonly used MCUs are integrated with CAN or UART link layer controllers. The level signal sent from the MCU is generally 5V or 3.3V. In order to achieve the purpose of connecting to the bus and remote transmission, it is often necessary to add a transceiver between the MCU and the bus, which plays the role of level conversion.
uses bus communication method to inevitably involve external communication traces, and CAN and 485 buses often require hundreds of meters of wiring. The longer the bus and the more complex the environment it passes, the more likely communication problems are to occur. The complex and changeable electromagnetic field in the external environment will indirectly raise the potential of the bus, and static electricity, surges, short circuits, etc. will directly act on the communication line. The above situations may cause damage to the transceiver at the least, and the motherboard failure at the worst. Therefore, it is necessary to add isolation before connecting to the bus.
2. There are many communication bus isolation solutions, how to choose?
communication isolation needs to take into account the impact of the isolation device on communication signal . Currently, the mainstream communication isolation solutions are optocoupler , capacitive coupling and magnetic coupling. The power supply isolation uses a micro-power DC/DC isolation power supply, so that there is no electrical connection between the input and the output, and avoids the impact of the power supply terminal on the transceiver.
Specifically, isolation can be implemented in two ways: is built with discrete components or uses integrated module . As a high-quality domestic power supply supplier, Jin Shengyang has successively launched a variety of communication interface bus product solutions according to market demand, including integrated modules and self-built components, enriching product lines to help you make flexible choices and meet application needs of various industries.
3333. Integrated power supply type, communication interface bus
1. "Core"-level experience-R4/R5 bus isolation transceiver series
using discrete module construction often involves the selection and procurement of many devices. It often needs to control the consistency of materials, and the design is time-consuming and labor-intensive. It is always worried about whether the design is reasonable, so the development cost soars.
Based on this, an isolation transceiver module integrating power isolation and digital isolation came into being. Jinshengyang launched the chip-level R4/R5 series CAN&485 bus isolation transceiver products. The compact size makes it easy to use while occupying less PCB area.
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2, integrated power supply isolation IC--TDA51S-41HC
integrated power supply isolation IC can be freely matched with 485/CAN module or ADC and other ICs.
3, communication interface bus for integrated power supply-module
Jinshengyang module communication interface bus has many different packaging forms (including potting and opening): SMD, DIP8, DIP24, pin is compatible with mainstream market products; in terms of functions, it has: high-speed, small size, (single/dual) automatic transmission and reception type, integrated AC/DC power supply type, etc., etc., to meet various industry application needs.
4. Non-integrated power supply type·chip-level communication interface bus
This type of product integrates a digital isolator and signal interface IC, which can be used with isolated power supplies to improve system reliability. The I/O port voltage range supports 3.3V and 5V microprocessors, the bus electrostatic protection capability is up to 15kV (HBM), and the communication rate is up to 1Mbps.
5. Signal interface IC/digital isolation IC
For traditional discrete component self-propelling solutions, Jinshengyang also prepared a dedicated CAN/485 signal interface IC and isolation IC for users. Pin to pin is compatible with international mainstream ICs, and domestically produced solutions to the concerns of material supply interruption, while meeting customers' high reliability and low cost requirements.
485 transceiver
CAN bus transceiver
Digital isolator
6. Summary
6. Summary
As the increase in industry demand and the increase in technical requirements, the speed of product updates and iteration of related digital interface transceiver components is also increasing. On the premise of meeting performance, Jinshengyang follows the market trend and strives to pursue high efficiency and reliability, help customers reduce the system size, improve system reliability, and provide users in different industries with worry-free and easy-to-use power supply products.
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