STMicroelectronics ASM330LHHX inertial measurement unit

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STMicroelectronics’ ASM330LHHX inertial measurement unit (IMU) moves smart driving a step closer to high levels of automation with its machine-learning (ML) core. The ML core enables fast real-time response and sophisticated functions with low system power demand.

Leveraging ST’s microelectromechanical systems (MEMS) technology, the automotive-qualified IMU houses a 3-axis accelerometer and 3-axis gyroscope in a 2.5 x 3 x 0.83 mm outline. The 6-axis module provides movement and attitude sensing for functions including vehicle positioning and digital stabilisation.

The ML core, a hardwired processing engine, runs AI algorithms directly on the sensor, enabling low latency between sensing an event and the vehicle’s response. This enables sophisticated real-time performance that demands lower system energy and computing power than a solution embedded on an application processor or cloud-based AI, the company says. Demonstration boards and free software example libraries are available to simplify application development. Functions available include vehicle-stationary detection, attitude and heading reference, altitude estimation, car-tow detection and crash detection.

The device has two operating modes, including low-power mode for running always-on applications like telematics, anti-theft systems, motion-activated functions, and vibration monitoring and compensation. When operated in low-power mode, the current is less than 800 µA with both the accelerometer and gyroscope running. There is also a high-performance mode for applications that demand high accuracy and low latency, including precise positioning, vehicle-to-everything (V2X) communication, and impact detection and crash reconstruction.

ST’s MEMS fabrication processes enable good sensor stability and low noise, seen in low measured Allan variance (AVAR) for both the gyroscope and accelerometer. The module is designed to maintain consistent high accuracy over the extended operating temperature range, from -40 to 105°C. The device is AEC-Q100 qualified.

For more information: www.st.com/asm330lhhx.