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Control Area Network CAN Bus & RS485 Communication Interface Design of Industry Internet of Thing2016/10/25

 The development of Industry 4.0 is popular for building smart factory. There will be a revolution for industry production through integration of smart control, Industry Internet of Thing(IIoT), machine to machine communication and cloud big data calculation. And then to reach for saving cost of manufacture, shorten of manufacture time and more fast response to requirement of market. The most important part of IIoT structure would be industry area network RS485 & CAN Bus for field equipment data transmission , monitoring, control and collecting. RS485 has been already become network communication interface for every industry equipment because of its cost advantage and simple implement. As for CAN Bus which is providing high security grade and efficient immediate control with fault detective and tolerant mechanism for more reliable and safe network data communication. The CAN Bus is a more complete smart control network interface.

 

The environment of field industry area network is very harsh. In general the warranty of industry electronic equipment should last for long period than consumer electronic products. That would be 5 years at least. To consider that RS485 and CAN Bus should be responsible for getting the first information in IIoT. Therefore it should be required higher ability of reliability. Including of ESD/Surge/EFT/Latch-Up/Hi-Pot/Polarity-Free/Fault Voltage such kind of enormous and important index of reliability would be the design considerations of RS485 and CAN Bus transceivers. There are component and system level of ESD test standard. The component ESD test should include HBM, MM and CDM models. As for system ESD level test would refer to IEC61000-4-2 which was known as ESD gun model. Surge is for simulation of induction damage of lightning and which was refer to IEC61000-4-5. EFT is for electrical fast transient event and simulation of the interference from transient burst to signal. The EFT test standard was refer to IEC61000-4-4. Latch-Up is for avoiding the self damage of industry local network chip because of the interference from outside current noise. The Latch-Up test standard would refer to JEDEC JESD78A. Hi-Pot is the ability index of high voltage isolation. The industry local network chip should sustain 50Hz~60Hz AC voltage for 60 seconds without the result of over 10mA current. That is for avoiding industry safety event because of the over high AC voltage difference between connection equipments. Polarity-Free design is for avoiding the bad signal because of the wiring misconnection of field factory local network. Fault Voltage is the sustainable DC voltage of factory local network signal line and that's for higher safe operation voltage range.

 

Amazing Microelectronic Company got the successful experience to help customer for building smart meter network. AMC actively step into development of smart communication network of charge station and charge pile which were under smart meter system. AMC closely cooperate with customer to develop RS485 and CAN Bus transceiver chip for industry market demand. For example of AMC RS485 transceiver chip, the system ESD level could be as high as exceeding IEC61000-4-2 contact +/-30kV and air +/-30kV limitation of the ESD gun equipment. As for component ESD level could up to HBM +/-15kV, MM +/-800V and CDM +/-2kV. The Latch-Up ability could over 400mA requirement to avoid damage of latch up effect. The Surge ability could up to IEC61000-4-5 30A level and EFT could up to 4.4kV test voltage. After the integration of differential capacitor isolation technique, it could upgrade Hi-Pot isolation capability to Vrms 2.5kV level. Specially to combine the auto detection and active circuit correction technology of polarity could avoid the wiring misconnect problem of industry local network. AMC has developed series of RS485 transceiver chip for low cost, low power and low voltage application to fulfill different customer requirements in the market. With regard to CAN Bus transceiver chip, AMC also developed the chip with Fault Voltage DC voltage up to 70V and Common Mode range up to DC 50V. It would make sure to guarantee CAN Bus transceiver chip still could work stably under more serious floating ground voltage. AMC would develop more reliable transceiver chips to support industry smart network working more safely and push to move forward of Industry 4.0 era.

 

                                       

                                             Figure 1: The series of industry RS485 transceiver from AMC.

 



                                         

                                                                     Figure 2: The industry CAN Bus AZCAN1040 transceiver from AMC.

 

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