LIN bus gateway connects up to 196 LEDs to a single BCM

LIN bus gateway connects up to 196 LEDs to a single BCM

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By Julien Happich

The fully featured LIN-to-LIN gateway is based upon the MLX16 RISC CPU application controller, a 16-bit MCU that includes 32kB Flash (with ECC), 16kB ROM, 2kB RAM and a 380b EEPROM (with ECC). The ROM comes pre-loaded with a LIN driver, bootloader, math library and an RGB colour mix algorithm. The LIN slave protocol controller operated up to 19.2kBaud and is compliant with LIN 2.x and SAE J2602. This block processes frames autonomously; ensuring that there are very few interrupts to the main application. Also included in the MLX81120 are a master and slave LIN transceiver, both of which are also compliant with LIN 2.x and SAE J2602. The 2nd master transceiver enables a decentralised ambient lighting architecture within a car, which makes it possible to easily add and/or change lighting functions for different car models or equipment options without changing the complex body control module or light ECU.

Extensive I/O capability is built in including four high voltage I/O lines, 16-bit PWM outputs, interrupt capable inputs and a 10-bit ADC with an integrated pre-driver. The MLX81120 has a highly efficient voltage regulator that consumes just 20μA in sleep mode. Other features include LED temperature compensation, LED leakage compensation / control and an integral battery and temperature monitor.

The flexible and configurable MLX81120 can be configured to meet customer needs via the flash memory and requires only three external components for LIN RGB, thereby saving board space and reducing the solution cost.

Offering an automotive temperature range of -40°C to +125°C and housed in a small DFN4x4 12-pin package the MLX81120 is available as PPAP samples, along with a useful demo board and development software.

Melexis –

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