MCU-Integrated Automotive Current Sensor for Low-Voltage Measurement

Melexis, a leading provider of innovative microelectronics solutions, has recently unveiled its latest product, the MLX91231. This shunt-based sensing automotive current sensor is designed specifically for measuring low voltage electronics in vehicle safety systems.

The MLX91231 offers exceptional accuracy and reliability, with a sensitivity drift error over temperature and lifetime below ±0.25%. Additionally, it boasts a 1.5μV input referred offset drift error over the same conditions, ensuring precise measurements in various operating environments.

One of the key features of the MLX91231 is its integration of a digital microcontroller (MCU) with 32kbyte flash memory. This integration allows the sensor to provide current, voltage, and junction temperature readout via a selectable LIN or UART output. Furthermore, the microcontroller enables built-in diagnosable overcurrent detection, which facilitates the safe triggering of pyro fuses without the need for a complicated safety mechanism.

Compliant with the ASIL B(D) standard as per ISO 26262, the MLX91231 can be supplied by a regulated 5V or directly by a 12V battery. It also supports system-level integration up to ASIL D, making it suitable for a wide range of automotive applications.

The MLX91231 is particularly well-suited for close monitoring of low-voltage systems, such as dc-dc converters, battery terminal sensors, and power distribution and monitoring in zonal infrastructure. Its output stability and EMC resilience ensure reliable performance even in the harshest automotive environments.

Operating within a temperature range of -40°C to +125°C, the MLX91231 is a robust and versatile solution. It is supported with custom software design, allowing for software reuse and simplifying system integration. Additionally, it comes in a compact eight-pin SOIC packaging, further enhancing its ease of use.

In conclusion, Melexis' MLX91231 shunt-based sensing automotive current sensor offers exceptional accuracy, reliability, and versatility. With its integrated microcontroller and advanced features, it is well-suited for a wide range of automotive applications. Whether it's monitoring low-voltage systems or ensuring safety in vehicle safety systems, the MLX91231 is a reliable and efficient solution.