company blog about ST ASM330LHH Automotive 6-Axis Inertial Measurement Unit For Drone

Shenzhen Mingjiada Electronics Co., Ltd. supplies and recycles the ST ASM330LHH automotive-grade 6-axis inertial measurement unit, suitable for drone applications.

I. Overview of the ASM330LHH Device

The ASM330LHH is an AEC‑Q100 automotive-grade 6-axis MEMS inertial measurement unit (IMU) that integrates a three-axis accelerometer and a three-axis gyroscope onto a single chip. It utilises a system-in-package (SiP) LGA‑14 package (2.5 × 3.0 × 0.83 mm) and features a wide temperature range, low noise and the capability for synchronous six-axis data output. Originally developed for in-vehicle dead reckoning applications, its automotive-grade reliability enables it to be adapted for use in industrial-grade drone flight control, attitude estimation and inertial navigation assistance applications.

II. Key Electrical and Sensing Parameters of the ASM330LHH

1. Accelerometer (three-axis)

- Selectable full-scale range: ±2 g / ±4 g / ±8 g / ±16 g

- Noise density as low as 60 µg/√Hz, with built-in temperature compensation to suppress temperature drift

2. Gyroscope (three-axis)

- Angular velocity range: ±125 to ±4000 dps, with multiple configurable settings to accommodate high-manoeuvrability and high-rotation conditions in UAVs

- Gyroscope noise density of 5 mdps/√Hz, ensuring high attitude calculation accuracy

3. Operating Conditions

- Power supply: 1.71–3.6 V

- Temperature range: –40 °C to +105 °C, suitable for high- and low-temperature outdoor drone operations

- Modes: Switchable between high-performance mode and low-power mode; typical power consumption in high-performance mode is 1.3 mA

4. Digital Interfaces: I²C, SPI, MIPI I3C, allowing direct connection to the flight controller MCU; six-channel hardware-synchronised sensor data output

5. On-chip Resources: 3 KB FIFO buffer, programmable finite-state machine (FSM), machine learning core (MLC); supports motion event interrupts and motion/stillness detection, reducing the computational load on the main controller

6. Reliability: AEC‑Q100 automotive-grade certification, RoHS-compliant packaging; not an ISO 26262 functional safety device; not intended for use in safety-critical chains.

III. Analysis of Key Features of the ASM330LHH

1. Six-axis hardware-synchronised sampling

Accelerometer and gyroscope outputs are time-aligned, eliminating software sampling time lags and enhancing the accuracy of drone attitude filtering and the EKF (Extended Kalman Filter) fusion algorithm; this extends the duration of pure inertial attitude maintenance when GPS is lost. STMicroelectronics.

2. Embedded temperature compensation

Given the significant day-to-night temperature variations encountered by drones outdoors, the chip incorporates a built-in temperature compensation mechanism to minimise temperature drift, reduce temperature-induced shifts in attitude angles, and decrease the calibration overhead for subsequent algorithms.

3. Flexible Range Configuration

For different operating conditions—such as hovering, high-speed manoeuvres, and spins and rolls—the range can be switched via software: a small range is used for hovering to achieve higher sensitivity; for aerobatic flight, switching to the large range of ±2000/±4000 dps prevents sensor saturation and overflow.

4. On-chip Intelligent Engine FSM+MLC

Vibration detection and attitude event recognition can be performed within the sensor itself, eliminating the need for continuous polling by the main controller; this is suitable for drone vibration monitoring and fall/loss-of-control early warning, whilst reducing overall system power consumption.

5. Dual Power Consumption Modes

High-performance mode is enabled during flight to ensure sampling rate; low-power mode can be switched to during standby or stationary hovering to optimise drone battery life.

IV. Summary of the ASM330LHH for UAV Applications

Suitable for UAV applications

- Attitude calculation for flight control and inertial navigation assistance, serving as an attitude backup in the event of GNSS (GPS/Beidou) failure;

- Multirotor and vertical take-off and landing (VTOL) UAVs operating in outdoor environments with high and low temperatures;

- UAV vibration monitoring and airframe attitude event detection;

- Works in conjunction with STM32 series MCUs to implement sensor fusion algorithms, outputting stable attitude angles.

Advantages over consumer-grade IMUs

Compared to standard consumer-grade 6-axis IMUs, the ASM330LHH has undergone rigorous automotive-grade testing, offering more stable performance across a wide temperature range, as well as superior noise and temperature drift specifications. It is suitable for industrial and specialised drones in scenarios with high reliability requirements, although this comes at the cost of higher component costs compared to consumer-grade MEMS devices.