What is LIN protocol?

LIN (Local Interconnect Network) is a serial network protocol used for communication between components in vehicles. The need for a cheap serial network arose as the technologies and the facilities implemented in the car grew, while the CAN bus was too expensive to implement for every component in the car.

CAN LIN bus system?

The CAN bus allows for components to talk to each other seamlessly in the automobile. The LIN bus allows for further expansion to peripheral devices. This bus hierarchy was designed to save costs and wiring. Wire is one of the most expensive components in a car.

How does LIN communication work?

LIN Frame Format. The LIN bus is a polled bus with a single master device and one or more slave devices. The master device contains both a master task and a slave task. If the slave task needs to publish a response, it transmits one to eight data bytes to the bus followed by a checksum byte.

How is LIN bus diagnosed?

An easy way to check the LIN wiring is to unplug the slave module and check the ‘at rest’ voltage of the LIN wire. The master should send out the 7 to 12 volt reference. If the wiring to the multi-function switch checks out good, replace the switch. If the input shows to be correct, check the bussed outputs.

What is difference between CAN and LIN?

LIN and CAN don’t compete with each other, but instead complement one another. On the one hand, CAN serves high-speed, error-sensitive needs and operates on a 5-V differential bus. LIN, however, serves low-speed, low-bandwidth requirements on a 12-V single-wire bus.

Where is LIN protocol used?

The new bus, called LIN bus, was invented to be used in simple switching applications like car seats, door locks, sun roofs, rain sensors, mirrors and so on. The LIN bus is a sub-bus system based on a serial communications protocol.

How does CAN bus work?

Devices on a CAN bus are called “nodes.” Each node consists of a CPU, CAN controller, and a transceiver, which adapts the signal levels of both data sent and received by the node. All nodes can send and receive data, but not at the same time. Nodes cannot send data directly to each other.

What voltage is LIN bus?

The LIN bus, and LIN transceivers, typically operate at voltages ranging from 9 V to 18 V, but some go up to 30 V, depending on the application; a typical vehicle is a 12-V battery system, but some larger vehicles go up to 24 V.

What is a LIN bus circuit?

The Local Interconnect Network (LIN®), ISO17897, is a multipoint, low-cost, easily-implemented communication bus in automobiles, working as a sub-bus for the Controller Area Network in most applications.

What does LIN bus do?

The LIN bus consists of a single wire and is used to exchange information between one master control module (such as an ECM, BCM, etc.) and one or more slave/smart device(s), such as switches, sensors, motors, etc. The LIN bus is relatively simple and exchanges data at a slower rate than other GMLAN buses.

CAN Hi CAN low voltages?

CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines.

CAN transceiver IC?

The TJA1050 is the interface between the Controller Area Network (CAN) protocol controller and the physical bus. The device provides differential transmit capability to the bus and differential receive capability to the CAN controller.

Which is the base for the Lin interface?

The wake-up functionality is covered within the LIN Interface, LIN Driver and LIN Transceiver Driver. The base for this document is the LIN 2.1 specification [17]. It is assumed that the reader is familiar with this specification.

What do you need to know about the LIN network?

The LIN network is described by a LDF (LIN Description File) which contains information about frames and signals. This file is used for creation of software in both master and slave. The master node controls and make sure that the data frames are sent with the right interval and periodicity and that every frame gets enough time space on the bus.

What are the different directions of the LIN bus?

Slave-to-slave There exist 3 different directions of frames on the LIN bus: Response transmitted by the master, Response received by the master and Response transmitted by one slave and received by another slave. The slave-to-slave is describing the last one. This is not described explicitly in the LIN 2.1 specification.

How is the LIN protocol used in microcontrollers?

Because the whole idea of LIN is to be a simple, cost-effective communication interface, a dedicated communication controller is not implemented. Rather a microcontroller is programmed with the LIN protocol, and used to drive the communication to the transceiver via the serial interface.

What is LIN protocol? LIN (Local Interconnect Network) is a serial network protocol used for communication between components in vehicles. The need for a cheap serial network arose as the technologies and the facilities implemented in the car grew, while the CAN bus was too expensive to implement for every component in the car. CAN…