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  • Fault-Protected LIN Transceivers

  • Created: Feb 13, 2014

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Summary

Fault-protected low-power local interconnect network (LIN) transceivers are ideal for use in automotive network applications where high reliability is required. The device provides the interface between the LIN master/slave protocol controller and the physical bus described in the LIN 2.0 specification package and SAE J2602 specification. The device is intended for in-vehicle sub-networks with a single master and multiple slaves. The extended fault-protected voltage range of ±60V on the LIN bus line allows for use in +12V, +24V, and +42V automotive applications. The device allows communication up to 20 baud and includes a slew rate limited transmitter for enhanced electromagnetic emissions (EME) performance. The device has a number of different set of modes.


Sleep mode is the lowest power-operating mode and the default state after power is applied to BAT. In sleep mode, it disables the LIN transmitter and receiver to reduce power consumption while RXD and INH are in high impedance. The internal slave termination resistor between LIN and BAT is disabled, and only a weak pull-up from LIN to BAT is enabled.


In standby mode, the LIN transmitter and receiver are disabled. The internal slave termination resistor between LIN and BAT is enabled, and the INH output is pulled high. In standby mode, RXD is driven logic-low to transmit the wake-up interrupt flag to a microcontroller. The wake-up source flag is presented on TXD as a strong pull-down in the case of a local wake-up. In the case of a remote wake-up, TXD is pulled low by the internal 330kΩ resistor only.


In normal slope mode, the device provides the physical layer interface to a LIN bus through RXD and TXD. INH is pulled high and the internal slave termination resistance from LIN to BAT is enabled. Data presented on TXD is transmitted on the LIN bus with a controlled slew rate to limit the EME. TXD must be driven logic-low to assert a dominant state on LIN. The LIN bus state is presented on the open-drain output RXD in which a dominant LIN state produces a logic-low on RXD.

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