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First RGB LED driver according to LIN standard with BSM auto addressing worldwide

8th October 2012

ES Admin

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With the IC E521.30, ELMOS introduces an RGB LED system basic chip. The component features a fully integrated BSM (bus shunt method) auto addressing LIN transceiver. BSM represents a method for addressing participants in an LIN bus system that is robust and has been proven millions of times. The BSM auto addressing method has been established among the German OEMs e.g. in the field of HVAC flap motors and has been used for almost ten years across the platforms, both robust and reliable. All development and diagnostic tools required for this method are in field use already. ELMOS has been a well-established provider of a fully integrated solution based on this method for several years.

A potential application of the E521.30 is the individual ambient lighting of the car’s interior with RGB LEDs. Thus the driver gets to choose between a rather stimulating or relaxing color variation, depending on situation and mood.

The method applied in the IC has very good fault tolerance, e.g. for “loss of ground”, and gives the option of a “mixed” assembly with LIN bus participants. Therefore even bus participants ignorant of BSM can be integrated into a system. Each bus participant can be reached via protocol anytime, even while addressing other participants. Broadcasts can be transmitted to all participants at any time. By simple software implementation in the slave, the master can validate address allocation. With this unique function, even address allocation can be subjected to diagnosis.

Systems in field use today include more than 16 participants already. The E521.30 has accommodated essential aspects such as optimized slave timing and low transceiver capacity in order to allow for an even larger number of bus participants.

The E521.30 has an integrated voltage regulator with an output power of 5V/ 100mA. For driving the LEDs, three LED drivers with a switching capacity of 50mA each are integrated. As another option, a four-LED-driver version is available on request. Furthermore, the E521.30 features elaborate protective functions (short-circuit, temperature) and FLASH mode. The component is obtainable in the version with three LED drivers in a VDFN14L4030 package and the four-LED-driver version in a QFN20L4 package.

The E521.30 LIN SBC has been developed according to standards LIN 2.1 and SAE-J2602 and in line with the high automotive requirements.