Automotive ambient lighting performance boosted and simplified

The MLX81113 raises system-on-chip capabilities, featuring the MLX16 FX 16-bit RISC microcontroller with 2 kbyte of RAM and 32 kbyte of application usable Flash memory, together with system ROM for increased application performance. The on-chip EEPROM is increased to 576 bytes for storing user data, such as LED calibration coefficients to ensure uniform brightness and color for automotive applications.

The four output current sources are software programmable and can deliver up to 60 mA, allowing the use of a wide range of RGB LEDs from different suppliers. Independent PWM control, configurable up to 16-bit resolution, provides the capability to adjust any color point and brightness level of the connected RGB LED. Built-in temperature monitoring ensures stable color over the full temperature range, from -40 °C to 125 °C, and permits temperature compensation for all color channels. Any temperature drift of red color as well as green and blue can be fully compensated. To support fast application development a complete toolchain is available, including an evaluation PCB as well as In-circuit-emulator and C-Compiler package. To simplify customers’ software development all essential software parts like LIN driver, color mixing and math library as well as IC initialisation routines are also available.

“Lighting is one of the key features for future personalisation and differentiation within the driver’s cabin. With our newest product we further extend our lighting product family to support this trend,” said Michael Bender, LIN product line manager at Melexis. “Our LIN-compatible RGB(W) drivers enable sophisticated yet cost-effective ambient lighting for vehicles from entry-level to mid-range and luxury models. The MLX81113 raises the performance bar and lowers the external component count, thanks to the very high EMC robustness archived by using silicon-on-insulator (SOI) technology. Additionally it is designed in accordance with ISO 26262 to ease system-level functional-safety certification.”

The MLX81113 contains a complete LIN system, including transceiver and protocol handler for connecting RGB ambient modules to the vehicle’s existing LIN network. Compliant with LIN2.x and SAE J2602 standards, and supporting auto-addressing, the on-chip system enables minimal module size and bill of materials (BOM) costs.

Manufactured using the newest silicon-on-insulator (SOI) technology, the MLX81113 features high-voltage I/Os and can operate from a supply voltage as low as 4 V, delivering superior performance even if the vehicle supply voltage fluctuates, such as during stop-start operation. Safety features include 28 V jump start, and battery over-voltage and under-voltage detection. The MLX81113 is in production now and can be supplied with PPAP in accordance with AECQ-100. It is available in a choice of SOIC8 exposed pad and leadless DFN10 3 mm x 3 mm thermally enhanced packages for superior thermal performance.