High tolerance of EMC/ESD characterises LIN transceiver

May 31, 2013 // By Christoph Hammerschmidt
Melexis range of devices supporting the local interconnect network (LIN) bus now includes the MLX80030, the third member of the company’s next generation of system basis ICs of LIN slaves. Pin-to-pin compatible with established LIN devices, such as the ATA6623/29 and TJA1028, this IC combines a physical layer LIN transceiver (according to LIN 2.x and SAEJ2602) with a 3.3V voltage regulator that has a reset output for the system microcontroller.

This transceiver is optimised for very low current operation, so that it draws only 15 µA while in standby mode. The integrated standby management function allows it to initiate 'wake up' from the LIN bus itself as well as directly from a connected microcontroller or other external source. By generating a reset output signal, the external circuitry necessary for the microcontroller can be reduced.

The MLX80030 delivers the electro-magnetic compatibility required for single wire bus systems. For self-protection, the IC is equipped with an integrated load current limitation and over temperature shutdown, as well as 40V load dump protection. Its electrostatic discharge characteristics allow it to deal with direct discharges of over 20 kV and indirect discharges of over 15KV (in accordance with IEC61000-4-2).

“The EMC behaviour of LIN bus ICs is critical in automotive applications. The MLX80030 displays remarkable resilience when subjected to high frequency disturbances,” says Michael Bender, LIN product line manager for Melexis. “It also achieves excellent ESD robustness to further simplify the design challenges of networked communication in hostile automotive environments.

Melexis, www.melexis.com