MEMS Accelerometer Designed for Industrial Motion Control, IMUs, INSs - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

MEMS Accelerometer Designed for Industrial Motion Control, IMUs, INSs

TDK Corporation released its Tronics AXO315, a miniature high-performance 1-axis closed-loop MEMS accelerometer with a 24-bit digital SPI interface and SMD package that reaches quartz sensors performances and eases integration. The new force-rebalance accelerometer delivers a one-year composite bias repeatability of 1 mg and composite scale factor repeatability of 600 ppm under severe temperature and vibration conditions common in industrial, land, railway, naval and construction applications. Its characteristics enable significant reduction in size, weight and cost of materials for industrial motion control units, inertial measurement units (IMU) and inertial navigation systems (INS), according to the company.

AXO315 is a ±14 g range, in-plane linear accelerometer. It has been designed and developed to provide high precision and reliability in challenging environments. It achieves a 1 mg composite bias repeatability over one year at temperatures ranging from -55 °C to +105 °C, and 4 g vibrations with an outstanding vibration rejection. Performance is augmented by its superior Allan variance characteristics, with an excellent bias instability of 4 µg, a velocity random walk of 0.006 m/s/vh, and very low noise of 15 µg/vHz, thus enabling high resolution and low error.

The new AXO315’s performance is equivalent to the incumbent analog quartz accelerometers and mechanical inclinometers, but at a fraction of their size, weight, and price, while remaining free from dual-use export control. AXO315 exhibits high performance levels and delivers an 80% gain in temperature stability compared to Tronics’ previous accelerometer generation AXO215. It comes in a lightweight 1.4 g hermetic SMD J-lead ceramic package (12 x 12 x 5 mm), enabling low-cost assembly and reliability on PCB, even in fast-changing temperature conditions.

With its performance and robustness, AXO315 is well suited for applications requiring high accuracy and stability in demanding environments, such as servo inclinometers and dynamic inclinometers in industrial motion control units, IMUs and INS for GNSS-aided positioning, and navigation of manned and unmanned ground vehicles and trains.

The AXO315 accelerometers are manufactured, tested and calibrated at Tronics Microsystems’ facility in Grenoble, France. Evaluation of the sensors can be made through an Arduino-based evaluation kit that is specifically designed to provide developers with improved testing functionalities such as output reading and recording, recalibration and digital self-tests. Full production of the sensors and availability through its network of distributors are scheduled for summer 2021.