All-in-one LIN motor driver

December 02, 2020 //By Ally Winning
Melexis has launched the third generation of the company’s LIN driver for small motors for automotive mechatronic applications at up to 10 W.
Melexis has launched the third generation of the company’s LIN driver for small motors for automotive mechatronic applications at up to 10 W.

The Gen 3 MLX81330 (0.5 A motor drive) and MLX81332 (1.0 A motor drive) smart LIN drivers are fabricated on high-voltage SOI (Silicon On Insulator) technology. The SOI process provides high levels of robustness and function density. It combines analog and digital circuitry for a true single-chip solution that complies with the LIN 2.x/SAE J2602 and ISO 17987-4 specifications for LIN slave nodes.

Besides the integrated motor driver, the solution features extensive I/O capability and a dual MCU architecture. One core is used for communications and the other MCU handles application software.

The high levels of integration found in the MLX81330 and MLX81332 mean a reduced BoM, smaller PCB, simpler product design and faster assembly. As an example, the MLX81332 connects directly to an ECU and can drive up to four phases of a motor, with a maximum current of 1 A per phase, or two phases with a maximum current of 1.4 A. It can drive a 2-wire DC motor, 3-wire BLDC motor or 4-wire bipolar stepper motor, using either sensored or sensorless field-oriented control (FOC) algorithms.

The smart LIN drivers provide 5 x 16-bit PWM timers, 2 x 16-bit timers and a 10bit ADC, along with a differential current sense amplifier and temperature sensors. Over-current, over-voltage and over-temperature detection/protection is also integrated. They can interface to standard external sensors using the most common automotive protocols, such as SPI and SENT.

The integrated processing cores have a common on-chip memory architecture. The application core (MLX16-FX) has access to 32 KB Flash with ECC, 10 KB ROM, 2 KB RAM and 512 byte EEPROM with ECC. The communications processor (MLX4) can access 6 KB ROM and 512 byte RAM.

The embedded motor controller ICs are designed for safety applications according to ASIL-B (ISO 26262).The smart LIN drivers are provided with software that includes the LIN communication stack.

More information
www.melexis.com

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