Shenzhen Mingjiada Electronics Co., Ltd. supplies and recycles the ST LIS25BA, a low-noise, high-bandwidth, three-axis accelerometer with a TDM interface, suitable for drone applications.
In drone flight control systems, three-axis accelerometers are the core sensing components for attitude estimation, motion detection and stabilisation; their noise levels, bandwidth range and data transmission efficiency directly determine the drone’s flight stability, control accuracy and dynamic response capabilities. ST’s LIS25BA is a three-axis MEMS digital accelerometer specifically designed for high-precision dynamic motion detection. With its core advantages of ultra-low noise, an ultra-wide flat bandwidth of 2400 Hz, and a dedicated TDM (Time Division Multiplexing) interface, it perfectly meets the flight sensing requirements of a wide range of UAVs, including consumer-grade, industrial-grade, crop protection and inspection models, providing reliable hardware support for high-precision attitude sensing and high-speed motion response in UAVs.
I. Core Product Specifications
The LIS25BA is a new-generation, high-performance three-axis MEMS accelerometer, optimised for high-frequency dynamic motion detection and high-precision attitude acquisition. Its core hardware specifications are precisely tailored to UAV flight conditions. The key parameters are as follows:
- Measurement Range: A fixed full-scale range of ±3.85g, suitable for acceleration variations across all drone flight scenarios—including take-off, hovering, diving and manoeuvring—covering the dynamic loads typical of conventional drone flight
- Sampling Accuracy: 16-bit high-precision digital output with extremely high resolution, capable of capturing acceleration changes caused by minute attitude fluctuations and subtle airflow disturbances
- Signal bandwidth: Ultra-wide, flat bandwidth from DC to 2400 Hz, with uniform frequency response across the entire spectrum and no significant gain fluctuations, accurately reproducing high-frequency flight vibrations and dynamic motion signals
- Ultra-low noise characteristics: Noise density as low as 30 μg/√Hz on the X and Y axes and 50 μg/√Hz on the Z axis; the extremely low background noise effectively mitigates interference from sensor noise on attitude calculation
- Shock resistance: Supports an ultra-high shock resistance rating of 20,000 g, capable of withstanding drone crashes, collisions,
- Package type: Miniaturised LGA-14L surface-mount package; compact and lightweight, suitable for the confined onboard space of drones without adding to the airframe’s load
II. Core Technical Advantages (Specifically Adapted for UAV Applications)
1. Ultra-low noise, ensuring precise flight attitude calculation
During UAV hovering, stationary flight and precision aerial photography, even minute sensor noise can directly cause attitude drift, airframe vibration and gimbal shake in the video feed. The LIS25BA incorporates ST’s proprietary MEMS noise-reduction process, achieving industry-leading low-noise performance with significantly reduced background noise compared to standard industrial accelerometers. Its uniform noise output characteristics effectively filter out spurious noise signals caused by low-frequency vibrations from the airframe motors and airflow disturbances, providing the flight control algorithms with clean, authentic raw acceleration data. This reduces attitude calculation errors at source, significantly enhancing the drone’s hovering stability and positional accuracy, thereby meeting the demands of high-precision operations such as aerial photography and surveying.
2. 2400 Hz ultra-flat bandwidth, suitable for high-frequency dynamic flight scenarios
Racing drones, high-speed inspection drones and manoeuvrable crop-spraying drones generate high-frequency dynamic acceleration signals during high-speed turns, rapid ascents and descents, and rapid attitude changes. Ordinary accelerometers lack sufficient bandwidth, leading to issues such as signal distortion, data lag and failed dynamic response, which result in poor flight control responsiveness and loss of manoeuvrability. The LIS25BA features an ultra-wide, flat bandwidth of DC–2400 Hz, with no signal attenuation or distortion across the entire frequency range. It can fully capture dynamic data from high-frequency manoeuvres, subtle airframe vibrations and rapid attitude changes, precisely meeting the control requirements of high-speed flight and rapid manoeuvres, thereby significantly enhancing the drone’s dynamic controllability and flight performance limits.
3. Dedicated TDM Interface for Efficient Adaptation to UAV On-Board Data Transmission
The LIS25BA employs a dual-interface design comprising a dedicated TDM (Time Division Multiplexing) digital interface paired with an I²C configuration interface, which is a key feature for adapting to the multi-sensor collaborative architecture of UAVs. The I²C interface handles sensor parameter configuration, mode switching and status monitoring, ensuring stability and reliability; the TDM interface focuses on high-speed data transmission, supporting multiple transmission rates including 8 kHz, 16 kHz and 24 kHz, and utilises an 8-slot, 16-bit data format that can be flexibly mapped to three-axis data channels.
Compared to traditional SPI and single-bus interfaces, TDM (Time Division Multiplexing) technology enables the synchronous transmission of data from multiple sensors on a time-sharing basis. This effectively simplifies the on-board wiring structure of UAVs, reduces the utilisation of the main controller’s I/O resources, and avoids issues such as data crosstalk and synchronisation deviations between multiple sensors. It ensures precise synchronisation between accelerometer data and data from sensors such as gyroscopes and magnetometers, significantly enhancing the efficiency of multi-source data fusion in flight control systems, and is well-suited to the multi-sensor redundancy architecture design of high-end UAVs.
4. High reliability and low power consumption, suited to UAV onboard operating conditions
UAVs impose stringent requirements on component stability, power consumption and immunity to interference. The LIS25BA features an ultra-high shock resistance of 20,000g, capable of withstanding instantaneous impact damage caused by in-flight collisions, accidental crashes and high-speed manoeuvres; its wide operating temperature range makes it suitable for complex outdoor operational environments, with minimal temperature drift and stable data accuracy in both high and low-temperature conditions. Furthermore, the device supports a sleep/disable mode with extremely low standby power consumption, effectively reducing the overall power consumption of the drone, extending its flight time, and meeting the design requirements for lightweight, long-endurance drones.
III. Core Application Value in Drone Scenarios
1. High-Precision Attitude Sensing and Stabilisation Control
Leveraging its low-noise, high-resolution characteristics, the LIS25BA provides clean acceleration data for the drone’s Inertial Measurement Unit (IMU). When combined with a gyroscope, it enables high-precision attitude calculation, facilitating accurate hovering, fixed-point locking and route flight. This effectively resolves issues such as airframe drift and minor vibrations caused by standard sensors, thereby enhancing the stability of aerial photography, surveying and exploration operations.
2. Precise Response During High-Speed Dynamic Flight
With an ultra-flat bandwidth of 2400 Hz and microsecond-level low latency, it is perfectly suited to the high-frequency manoeuvring scenarios of racing drones and high-speed inspection drones. It responds rapidly to control commands and accurately captures instantaneous attitude changes, enhancing flight responsiveness and dynamic stability, whilst supporting extreme manoeuvres such as sharp turns, rapid dives and steep climbs.
3. Efficient Multi-Sensor Co-ordination, Simplifying On-Board Design
A dedicated TDM interface supports synchronised networked data transmission from multiple sensors, enabling the simultaneous acquisition of IMU and multi-sensor data without complex cabling. This reduces the complexity of flight control board design, minimises the overall hardware volume and weight of the aircraft, and is suitable for compact, lightweight consumer-grade drones, whilst also meeting the high-precision and high-reliability system architecture requirements of industrial drones.
4. Flight Fault Monitoring and Vibration Analysis
With its high-bandwidth, high-frequency signal capture capability, the LIS25BA can accurately collect data on drone motor vibrations and micro-vibrations in the airframe structure. This data is utilised for flight status monitoring, fault prediction and structural fatigue analysis, providing data support for routine inspections and equipment health monitoring in industrial drones, thereby enhancing operational safety and extending the service life of the drones.
IV. Summary
The ST LIS25BA three-axis accelerometer precisely addresses the core challenges of drone flight sensing. With four key advantages—ultra-low noise ensuring accuracy, high flat-bandwidth enabling dynamic flight, a TDM interface optimising system architecture, and high reliability suited to complex operating conditions—it has become the preferred sensing solution for high-end consumer drones, industrial inspection drones, racing drones and crop protection drones. Combining high precision, high dynamics, high stability and ease of integration, it not only meets the stable control requirements of routine flight but also supports the technological upgrades of high-speed, high-precision and intelligent drones, making it a core, high-performance component for drone inertial navigation and attitude sensing systems.
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