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Local Interconnect Network
The document discusses Local Interconnect Network (LIN), a simple automotive network protocol that can be used as an economical alternative to CAN bus in some applications. LIN uses inexpensive UART/SCI peripherals and internal oscillators. It has lower data rates and node counts than CAN but provides less error detection. LIN is best for low-speed applications like sensors and small actuators, with a single master and multiple slaves on a bus topology. The protocol uses 6-bit identifiers and 8-byte frames for messaging between nodes and different frame types. Common automotive applications mentioned include sensors, lighting, seating and door controls.
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Overview of Local Interconnect Network (LIN) presented by Jabez Winston and Jagadeesh S.
LIN is economical and suitable for automotive applications where CAN is excessive, using UART and internal oscillators.
LIN cannot replace CAN due to lower speeds, less robust error detection, and poorer fault tolerance.
LIN's specifications include 6-bit identifiers, 19.2 kbps speed, 16 nodes, and a half-duplex bus topology.
Visual representation of a typical LIN bus wiring and configuration.
An outline of LIN message structure, including 6-bit message IDs and master-slave communication.
Further specifications on LIN's operational setup and message structure for programming context.
Describes tasks and roles assigned to various nodes within the LIN network.
A detailed overview of the state machine governing the tasks of the master node in LIN.
Overview of frame processing mechanisms within the LIN protocol.
Different LIN frame types such as unconditional, event-triggered, and diagnostic frames.
Various applications of LIN in automobiles, including sensors and control mechanisms across vehicle systems.
Provides web references for further reading on Local Interconnect Network and related technology.
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Local Interconnect Network
- 1. Local Interconnect Network JABEZ WINSTONC -15MU01 JAGADEESH S -15MU02
- 3. Why LIN? Useof CAN in certain automotive applications can be a overkill Highly Economical UART / SCI peripheral can be used to implement LIN Use of simple internal RC oscillators instead of external crystal oscillators No protocol license fee
- 4. Why LIN isnot a replacement for CAN? CAN can operate at higher speeds Superior error detection scheme (CRC) Fault tolerant capabilities
- 5. Brief Technical specificationsof LIN 6 bit protected identifier Content based addressing Speed - 19.2 kbps (Max.) 8-bytes per frame (Max.) 16 nodes (Max.) Half Duplex 8-bit Checksum Single Master – Multiple Slave configuration Bus Topology
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- 7. Abstract view ofLIN A programmer needs to be concerned with the Message ID – 6 bits Data – up to 8bytes Master manages the bus access arbitration scheme entirely The Master sends a Frame Header and the concerned slaves respond.
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- 10. MASTER TASK STATEMACHINE
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- 12. Frame types 1. Unconditionalframe 2. Event-triggered frame 3. Sporadic frame 4. Diagnostic frame 5. User-defined frame 6. Reserved frame
- 13. Applications of LIN Applicationsegments Specific LIN application examples Roof Sensor, light sensor, light control, sun roof Steering wheel Cruise control, wiper, turning light, climate control, radio Seat Seat position motors, occupant sensors, control panel Engine Sensors, small motors, cooling fan motors Door Mirror, central ECU, mirror switch, window lift, seat control switch, door lock Illumination Vehicle trim enhancement, sill plates illuminated with RGB LED
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