Melexis launches all-in-one LIN motor driver

The Gen 3 MLX81330 (0.5 A motor drive) and MLX81332 (1.0 A motor drive) smart LIN drivers are based on high-voltage SOI (Silicon On Insulator) technology to deliver high levels of robustness and function density, combining analogue and digital circuitry to create single-chip solutions that are fully compliant with the industry standard LIN 2.x/SAE J2602 and ISO 17987-4 specifications for LIN slave nodes.

Along with an integrated motor driver, they feature extensive I/O capability and a dual microcontroller architecture. One core is dedicated to communications while the second microcontroller runs the application software.

With their ‘all-in-one’ approach to LIN slave design, the MLX81330 and MLX81332 enable a reduced Bill of Materials (BoM), smaller PCB, simpler product design and faster assembly. For example, the MLX81332 interfaces directly with 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. This means 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 include 5x16-bit PWM timers, 2x16-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. In addition to analogue-ready I/O, they are able to interface to standard external sensors using protocols commonly used in automotive applications, such as SPI and SENT.

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