कंपनी ब्लॉग के बारे में ST LIS2DH12 MEMS Digital Output Three-Axis Linear Accelerometer For Drones

Shenzhen Mingjiada Electronics Co., Ltd. supplies and recycles the ST LIS2DH12 MEMS three-axis linear digital output accelerometer, suitable for drone applications.

I. LIS2DH12 Product Overview

The ST LIS2DH12 is an ultra-low-power, high-performance MEMS three-axis linear digital output accelerometer launched by STMicroelectronics. It forms part of ST’s ‘Femtosecond/Nano’ series of micro-sensor chips and is specifically designed for motion detection scenarios requiring low power consumption, high dynamic response and high stability. The chip integrates high-precision triaxial acceleration sensing units with a digital signal processing module. It requires no external analogue-to-digital conversion circuitry and can directly output standardised digital signals. It is perfectly suited to core functions such as flight attitude sensing, motion monitoring and safety protection in consumer-grade and industrial-grade small drones, making it one of the preferred core components for drone inertial measurement units (IMUs).

This chip eliminates the signal interference and accuracy loss associated with traditional analogue sensors, whilst offering the advantages of a wide measurement range, high refresh rate, ultra-low power consumption and a miniature package. It is compatible with various drone models, including multi-rotor drones, fixed-wing drones, portable aerial photography drones and small inspection drones, and is capable of stably collecting flight motion data in complex outdoor environments, providing precise data support for attitude calculation and stability control within flight control systems.

II. LIS2DH12 Core Hardware Parameters and Key Features

1. Core Performance Parameters

The LIS2DH12 features parameter configurations optimised for the flight dynamics of drones, catering to the detection requirements of both low-speed, stable flight and high-speed manoeuvrable flight. The core parameters are as follows:

- Configurable detection range: Supports four range settings—±2g, ±4g, ±8g and ±16g—to adapt to different operating conditions such as hovering, steady cruising, rapid dives, sharp turns and turbulent flight. The ±2g setting is suitable for routine attitude detection, whilst the ±16g setting can handle extreme scenarios such as high-speed manoeuvres and crash impacts.

- Ultra-high data refresh rate: The output data rate (ODR) covers a wide range from 1 Hz to 5.3 kHz; the high-frequency mode can accurately capture instantaneous changes in the drone’s attitude, effectively resolving data lag issues during high-speed flight and manoeuvring, thereby ensuring the real-time performance of the flight control system.

- High-precision sensor output: Sensitivity ranges from 1 mg/digit to 192 mg/digit, offering excellent resolution that accurately detects minute tilts, vibrations and displacement changes in the drone, significantly enhancing attitude calculation accuracy.

- Wide operating voltage range: Operating voltage ranges from 1.71 V to 3.6 V, with support for an independent 1.8 V I/O power supply. It is compatible with UAV lithium-ion battery buck power supply systems and various flight controller mainboard power supply circuits, offering exceptional hardware adaptability.

- Extremely low power consumption: Power consumption in sleep mode is as low as 2 μA. Supports intelligent sleep wake-up and sleep reset functions, enabling low-power standby and flight-activated wake-up modes for drones, thereby effectively extending flight endurance.

2. Hardware Interfaces and Functional Features

The chip is equipped with general-purpose industrial-grade digital interfaces and programmable functional modules, which significantly simplify the hardware design of drone flight control systems and enhance system stability:

- Dual digital communication interfaces: Comes standard with dual serial digital interfaces—I²C and SPI. The high-speed SPI interface meets high-frequency data transmission requirements, whilst the I²C interface enables multi-sensor networking, facilitating the coordinated operation of the drone’s IMU module with gyroscopes and magnetometers.

- Programmable interrupt mechanism: Features two built-in independent programmable interrupt generators, supporting free-fall detection, motion detection and attitude tilt detection, which can directly trigger functions such as drone loss-of-control protection, crash lock and attitude anomaly alarms.

- Intelligent attitude detection algorithm: Native support for 6D/4D attitude and orientation detection, enabling precise identification of changes in the drone’s pitch, roll and yaw axes, and allowing basic attitude determination without the need for complex algorithm porting.

- Built-in FIFO buffer and self-test function: An integrated data FIFO buffer unit caches flight motion data to prevent data loss during high-speed sampling; a built-in self-test module automatically verifies the sensor’s operational status upon power-up, ensuring the reliability of the drone’s flight.

- Compact, lightweight packaging: Utilises an ultra-compact LGA package, which is small in size and light in weight, placing no additional load on the drone’s airframe and perfectly meeting the design requirements of lightweight, small drones and micro aerial photography drones.

III. Application Advantages of the LIS2DH12

1. Meets the core requirements of drone flight control

The core of drone flight lies in attitude stability and precise motion control. Thanks to its precise three-axis acceleration sensing capability, the LIS2DH12 can monitor the drone’s linear acceleration, vibration and tilt along the X, Y and Z axes in real time. Combined with gyroscope data to perform IMU data fusion, it achieves high-precision attitude estimation, ensuring stable hovering, precise flight path tracking and smooth manoeuvring. This effectively suppresses flight vibrations and drift, significantly enhancing the stability of aerial photography and inspection operations.

2. Low Power Consumption to Meet Drone Endurance Requirements

Flight endurance is a core performance metric for drones, and the LIS2DH12’s ultra-low power consumption offers a significant advantage. When the drone is on standby or hovering at a fixed point, the chip can enter a low-power sleep mode, significantly reducing the overall power consumption of the aircraft; it automatically wakes up and resumes operation only when it detects body movement or changes in attitude. This dynamic power management mechanism minimises idle power consumption and, compared to traditional accelerometers, effectively reduces the overall power consumption of the sensor module, thereby extending the drone’s operational endurance.

3. High reliability suited to complex operational environments

Drones often operate outdoors at high altitudes in complex airflow conditions, where they are susceptible to air turbulence, airframe vibrations and temperature fluctuations. The LIS2DH12 boasts excellent resistance to vibration and interference. Its built-in signal filtering mechanism filters out high-frequency vibration noise during flight, outputting clean and reliable motion data; simultaneously, the chip offers high operational stability with minimal temperature drift, maintaining high precision across a wide temperature range, making it suitable for complex operational scenarios such as outdoor inspections, aerial photography and surveying.

4. Intelligent Safety Protection for Drone Flight Safety

Leveraging its built-in free-fall detection and motion anomaly interruption functions, the LIS2DH12 enables the establishment of a proactive safety protection system for drones. In the event of uncontrolled descent, severe attitude abnormalities or unexpected collisions, the chip immediately triggers an interrupt signal, which is relayed to the flight control mainboard to rapidly execute protective actions such as power cut-off, parachute deployment and emergency attitude correction. This reduces the risk of drone crashes and damage, thereby enhancing flight safety.

IV. Typical Application Scenarios for the LIS2DH12 in Drones

- Consumer-grade aerial photography drones: Provides high-precision attitude detection to ensure stable hovering and smooth flight, eliminating camera shake in aerial footage. When paired with a gimbal, it enables high-definition, stable filming, whilst motion detection facilitates intelligent functions such as handheld take-off and attitude locking.

- Industrial inspection drones: Suited to the long-duration operational requirements of drones used in power, photovoltaic and security inspections; its low power consumption supports extended cruising times, whilst high stability ensures flight path accuracy in complex airspace and turbulent conditions; anomaly attitude detection ensures safety during high-altitude operations.

- Micro racing drones: With an ultra-high data refresh rate of 5.3 kHz, it precisely captures instantaneous changes in acceleration during high-speed manoeuvres, rapid turns and dives, meeting the real-time control requirements of high-dynamic flight for racing drones. Its wide measurement range of ±16g is suitable for extreme manoeuvring conditions.

- Educational and Research Drones: Featuring universal interfaces, simple configuration and controllable costs, it is suitable for university drone teaching, attitude algorithm R&D, and inertial navigation experiments. Parameters can be flexibly configured, facilitating secondary development and functional debugging.

V. Summary of the LIS2DH12

As an ultra-low-power, high-precision, and highly reliable three-axis MEMS accelerometer, the ST LIS2DH12 perfectly aligns with the core design requirements of drones: lightweight construction, low power consumption, high stability, and high dynamic response. Its key advantages—configurable measurement range, wide refresh rate, intelligent motion detection and minimal hardware adaptation requirements—enable it to comprehensively cover attitude sensing, motion monitoring and safety protection scenarios across consumer-grade, industrial-grade and micro drones. As a high-quality core component for drone IMU inertial sensing systems, it combines excellent practical performance with exceptional value for money in development, making it widely applicable to the mass production and iterative R&D of various drone products.