Freescale Semi

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  • Created: Aug 11, 2015

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Summary

The Local Interconnect Network (LIN) bus is a single wire sub-bus system that is used in vehicles as a communication link for the components within the vehicle automotive system. The LIN bus was created to provide a low cost communication link in automotive networks. Though the Controller Area Network (CAN) bus can provide the features available in LIN bus, the costs of implementing its hardware and software is excessively high for smaller applications such as door locks, sensors, vehicle seats, and so on. That is why car manufacturers created the LIN standard. The LIN consists of a master and multiple slave microcontrollers. It uses a transceiver to interface the digital part of the microcontroller and the physical line.


This reference design features the Freescale KIT33663_EFEVB Evaluation Board. It uses the MC33663ALEFR2 Dual LIN transceiver IC that has two independent LIN bus controllers with a maximum baud rate of 20 kbps as its principal device. The evaluation board has separate switches that enable each of the controllers. It has separate push-buttons that wake up the controller from sleep mode. The board power supply inputs are routed individually for the VDD and VBAT. It has six LEDs that indicate its status and has test points for every pin.


The MC33663ALEFR2 device used in this evaluation board can operate from a voltage supply ranging from 7 to 18V DC supply. This device is compatible with the LIN 2.1 protocol specification and SAEJ2602-2 standard. It has high immunity against electromagnetic interference and can sustain +-15kV electrostatic discharge on its LIN BUS and VSUP pins based on IEC6100-4-2 standard. The device has an over-temperature protection to prevent overheating especially that the device is used in an automotive system where heat is always present.

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