By LEIDITECH | 30 April 2024 | 0 Comments
LINdata busESDProtection plan
LINBus（Local Interconnect Network）It is a serial communication protocol used in vehicle electronic systems。LINThe interface is the same as other exposed interfaces，Also subject to electrostatic discharge (ESD) Impact of。Electronic engineers need to design protection measuresdiodeofLIN The interface can be LIN transceiverProvide protection for itself and corresponding downstream bus components。
What isLINBus
LINThe bus is mainly used to connect various control units in the vehicle，Like sensors、Performers and other electronic devices。LINBuses are typically used for low speeds、Low cost applications，For example, some basic functions inside the vehicle，For example, door control、Window control、Seat control, etc。It is suitable for some application scenarios that do not require high speed and bandwidth。LINBuses typically operate at relatively low data transfer rates，The maximum speed is 20Kbit/s。LINThe bus is based onSCI(UART)data format，Adopting a single master controller/Multi slave device mode，Up to 15 points can be accessed from。These nodes are classified according to ISO 17897 Standard connection to a single line LIN On the line。 LINBus bias to car battery，Usually 12V。Due to the same vehicleLINThere is a possibility of a short circuit between the network and the voltage source，If you want to jump start，You need to go through 24VBattery completed，chart 1 Showcased a LIN Transceiver node，This node is powered by car batteries and connected to a single lineLINline。
LINReasons for static electricity generation on the bus
LINExposed bus interface connectors in external environment，When LIN When the bus comes into contact with the outside world，There is a risk of high voltage impact on the bus。This type of high-voltage shock or transient can cause damage LIN Transceivers and backend components。
After the assembly of the product on the factory production line，The cable may accumulate too much charge。Once the cable is connected to LIN Bus，The excess charge will flow into the circuit，Resulting in permanent damage。When maintaining a car，If the cable is disconnected and reconnected，It may also occur ESD event。in addition，Multiple electronic control units (ECU) Getting closer to each other，May trigger ESD Impact。in short，LIN The bus will be affected in various situations ESD influence，Therefore, it must be considered。
Shanghai Leiditech LINBus interfaceESDProtection plan
Leiditech LINBus interfaceESDProtection adopted：PESD1LIN ESDdiode
The schematic diagram is as follows：
方案优势：
PESD1LIN 采用小型封装SOD-323如下：
l Each device can protect a single carLINBus。Provides a flexible single data line electrostatic protection solution for automotive networks。
l IEC 61000-4-2 (Electrostatic protection)±23kV (air/contact) ，satisfyIEC 61000-4-2 Level 4。
l IEC 61000-4-5(Surge protection): 5A (8/20μs)
l Low junction capacitance 15PF(Typical value），Meet signal integrity transmission requirements
l Get a carAEC-Q101 Certification
l PESD1LIN The parameter table is as follows
PESD1LIN Suggestions for circuit layout and device placement
1. takePESD1LINPlace as close to the input terminal or connector as possible。
2. .Should be minimized as much as possiblePESD1LINThe length of the path between the protection line。
3. Keep parallel signal paths to a minimum。
4. Avoid running protective conductors in parallel with unprotected conductors。
5. Minimize all printing as much as possiblecircuit board（PCB）Conductive circuit，Including power and grounding circuits。
6. Minimize the length of transient return path to ground。
7. Avoid using shared transient return paths to common grounding points。
8. Grounding planes should be used as much as possible。For multi-layer PCBUsing a grounding through-hole。
If you need more interface protection requirements, please pay attention to Shanghai Leimao official account or contactEMCLittle brother。
Shanghai Leimao Professional R&D and SalesESD，TVS，TSS，GDT，MOV，MOSFET，RectifierOther products。We are committed to providing customers with high-quality products，To protect the circuit from static interference and voltage fluctuations。Our products cover a wide range of application areas，Including electronics、communication、computer、automobile、Medical and other industries。We have an experienced R&D team，Capable of providing personalized customization services based on customer needs，Provide customers with the highest quality solutions。
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