Blog về công ty ST AIS328DQ Automotive Linear Accelerometer With SPI/I2C Digital Output For Drone Applications

Shenzhen Mingjiada Electronics Co., Ltd. supplies and recycles the ST AIS328DQ automotive-grade linear accelerometer, featuring SPI/I²C digital output, suitable for drone applications.

ST’s AIS328DQ is an ultra-low-power, three-axis linear MEMS accelerometer certified to the AEC-Q100 automotive standard. It combines industrial-grade sensing accuracy, automotive-grade environmental resilience and a flexible dual SPI/I²C digital output interface, making it ideally suited for core applications in consumer-grade and industrial-grade drones, such as attitude detection, motion tracking and anti-shake control, providing reliable hardware support for intelligent, high-precision flight control systems.

I. AIS328DQ: Core Product Positioning and Automotive-Grade Reliability

The AIS328DQ is a high-performance triaxial accelerometer designed by ST specifically for demanding operating conditions. Unlike standard consumer-grade sensors, it has passed the authoritative AEC-Q100 automotive-grade certification, offering exceptional environmental adaptability and operational stability, thereby overcoming the performance limitations of traditional industrial sensors in extreme temperatures, vibration and interference-prone environments. The device operates across a wide temperature range of –40°C to +105°C, enabling it to effortlessly cope with complex operating conditions such as low temperatures at high altitudes, intense heat from direct sunlight outdoors, vibrations during high-speed flight, and airflow disturbances. It eliminates issues such as temperature drift, data distortion and sensor failure, ensuring stable flight perception across all scenarios.

Furthermore, the AIS328DQ sensor is manufactured using proven MEMS (Micro-Electro-Mechanical Systems) technology, integrating a high-precision sensing unit with digital processing circuits. By eliminating signal loss and interference associated with analogue outputs, it features a 16-bit high-precision digital output capable of accurately capturing even the slightest changes in acceleration. This provides high-precision raw data for drone attitude calculation, displacement measurement and tilt detection, effectively enhancing the smoothness of flight control and positioning accuracy.

II. Dual SPI/I²C Digital Interfaces, Suitable for a Wide Range of UAV Hardware Architectures

Flexible communication interfaces are a core advantage of the AIS328DQ in adapting to various UAV control systems. The device natively supports dual digital communication interfaces—SPI and I²C—allowing direct connection to mainstream UAV MCUs and flight control chips without the need for additional adapter circuits. It is compatible with different hardware design solutions, significantly simplifying the circuit design of UAV flight control boards whilst reducing development costs and hardware footprint.

The SPI interface, in particular, offers high data transfer rates and strong interference resistance, meeting the real-time data transmission requirements for high-speed flight and rapid dynamic attitude adjustments, whilst ensuring millisecond-level response times from the flight control system. The I²C interface features simple wiring and minimal pin usage, making it well-suited to the lightweight and compact design requirements of small mini-drones and portable aerial photography drones. The dual-interface compatible design enables this sensor to cover the full range of drone equipment, including micro consumer drones, medium-sized aerial photography drones, industrial inspection drones and crop protection drones, offering exceptional adaptability.

Furthermore, the AIS328DQ supports 1.8V low-voltage I/O compatibility and a wide supply voltage range of 2.16V to 3.6V, making it suitable for scenarios involving voltage fluctuations in drone battery power supplies. It offers high power supply stability and is compatible with various drone power module designs.

III. Flexible and Adjustable Performance Parameters to Meet Flight Perception Requirements Across Multiple Operating Conditions

The AIS328DQ allows users to dynamically select from three full-scale measurement ranges: ±2g, ±4g and ±8g. Parameters can be flexibly switched according to different drone flight conditions, balancing high-precision static detection with wide-range dynamic motion monitoring. The ±2g range is suitable for scenarios such as drone hovering, low-speed steady flight and static tilt calibration, offering higher sensing accuracy; The ±8g wide-range setting is suitable for scenarios involving high-speed dives, rapid turns, manoeuvrable flight and collision detection, comprehensively covering the acceleration detection requirements across all drone flight states.

In terms of data output rate, the AIS328DQ supports a programmable output rate ranging from 0.5 Hz to 1 kHz, allowing the sampling frequency to be flexibly configured according to flight control algorithm requirements, thereby balancing data accuracy with device power consumption. It also features an ultra-low-power operating mode, with minimum power consumption reduced to 10 μA. Combined with the built-in intelligent sleep/wake-up energy-saving mechanism, it enables intelligent power management during drone standby and flight wake-up, effectively reducing the drone’s overall power consumption and extending flight endurance, perfectly meeting the core requirements for optimising drone flight duration.

The AIS328DQ also integrates two independent, programmable interrupt generators with customisable trigger thresholds. It supports real-time alerts for conditions such as abnormal drone attitude, excessive tilt angles, severe vibrations and collision impacts, assisting the flight control system in implementing functions such as attitude correction, emergency obstacle avoidance and fault protection, thereby significantly enhancing drone flight safety. At the same time, it features a built-in 32-level FIFO buffer, which effectively caches sensor data, reduces the load on the main controller, prevents data loss and enhances system operational stability.

IV. Core Application Scenarios for the AIS328DQ in Drones

1. Drone Attitude Estimation and Balance Control

As the core sensing component of the flight control system, the AIS328DQ collects real-time three-axis acceleration data and, in conjunction with gyroscope and magnetometer data, performs multi-sensor fusion calculations. It accurately measures the drone’s pitch, roll and yaw angles, corrects flight attitude in real time, ensures stable hovering and smooth cruising, effectively suppresses air turbulence-induced body sway, and enhances aerial photography image quality and flight stability.

2. Motion State Monitoring and Trajectory Tracking

Leveraging its wide-range, high-precision acceleration detection capabilities, the AIS328DQ precisely captures the drone’s motion states—including acceleration, deceleration, turning and vertical movement—providing accurate data support for intelligent flight functions such as fixed-point flight, route planning, autonomous cruising and return-to-home landing. This ensures the accuracy of the drone’s flight trajectory, meeting the high-precision operational requirements of industrial inspections, surveying and mapping, and crop protection.

3. Intelligent Power Management and Standby Wake-up

With the AIS328DQ’s built-in ultra-low-power mode and intelligent wake-up function, the drone can enter static standby hibernation and automatically wake up during dynamic movement, significantly reducing standby power consumption and extending the overall flight endurance. Additionally, it can determine the drone’s start/stop status via acceleration thresholds, enabling intelligent control functions such as power-on self-tests, standby hibernation and abnormal shutdown.

4. Flight Safety Protection and Fault Detection

Through its programmable interrupt function, the AIS328DQ can monitor abnormal operating conditions in real time—such as severe vibrations, excessive tilt, and collision impacts—and rapidly trigger mechanisms within the flight control system, including attitude correction, emergency hovering and forced landing protection. This effectively mitigates the risks of flight instability and crashes, enhancing the safety and reliability of drone operations in complex outdoor environments.

V. Summary of the AIS328DQ’s Product Advantages

With its five core advantages—automotive-grade reliability, flexible adaptation via dual SPI/I²C interfaces, wide-range high-precision sensing, ultra-low power consumption, and wide-temperature interference resistance—the ST AIS328DQ overcomes the pain points of traditional consumer-grade sensors, such as poor stability, limited interfaces and weak adaptability to operating conditions. Its compact QFN24 package (4×4 mm) meets the structural design requirements for lightweight and compact drones, whilst balancing high performance with low power consumption. It is fully compatible with a wide range of drone application scenarios, including consumer entertainment, aerial photography and surveying, industrial inspections, and agricultural crop protection, making it a high-quality core sensor solution for drone flight control and sensing systems.