LSM6DS3TR-C (STMicroelectronics iNEMO 6-axis IMU Inertial Measurement Unit)

ST MEMS 6-axis inertial sensor (IMU) in system-in-package, integrating a 3-axis accelerometer and a 3-axis gyroscope. It embeds motion detection engine and 4KB FIFO. Featuring low power consumption, it supports Always-On motion detection. Digital interfaces I2C and SPI are available for direct connection with MCU (compatible with EFM8BB21 mentioned above) to collect attitude, tilt, vibration and motion data.

## Key Specifications

1. Sensing Axes: 3-axis accelerometer + 3-axis gyroscope (6DoF six degrees of freedom)

2. Accelerometer Full Scale: ±2 / ±4 / ±8 / ±16 g (configurable via software)

3. Gyroscope Full Scale: ±125 / ±250 / ±500 / ±1000 / ±2000 dps (°/s)

4. Supply Voltage: Analog supply **1.71V ~ 3.6V**; IO supply minimum 1.62V

5. Power Consumption: Typical 0.9mA in combined high-performance mode; lower current in low-power mode

6. Communication Interfaces: I2C + SPI

7. Memory: Built-in **4KB FIFO data buffer**, reduces MCU read frequency and lowers system power consumption

8. Embedded Function Engines: FSM finite state machine, MLC machine learning core for hardware motion event recognition

9. Temperature Range: **-40℃ ~ +85℃** (consumer grade)

10. Package: LGA14, dimension 2.5mm ×3mm ×0.86mm, tape & reel packaging

11. On-chip Resource: Integrated temperature sensor

12. Interrupts: Two interrupt pins INT1 / INT2

## Functions

1. Attitude and Tilt Detection: 6-axis data fusion to calculate tilt angle, orientation and attitude of the device; 6D orientation detection

2. Hardware Recognition of Motion Events (no MCU calculation required): Free fall, single/double tap, wake-up/sleep, significant motion detection

3. Pedometer: Built-in step detection and step counter for wearable devices

4. Vibration Monitoring: Captures vibration signals for equipment vibration diagnosis

5. FIFO Buffer: 4KB buffer stores sensor data in batches. MCU reads data in bulk to cut frequent communication overhead and save power

6. Sensor Hub: Supports external connection of other sensors to expand sensor nodes

7. Always-On Operation: Continuously monitors motion at low power. Automatically enters power-saving mode at rest and wakes up MCU upon motion trigger

8. Temperature Measurement: Integrated temperature sensor monitors chip temperature

 Applications

- Wearable Devices: Smart bands, smart watches, motion sensors

- Consumer Electronics: Smartphones, tablets, remote controllers, VR/AR accessories

- IoT Devices: Wireless attitude acquisition terminals, indoor positioning modules

- Robotics: Gimbal attitude detection, motion sensing for small robots (compatible with EFM8BB21 main controller solution)

- Industrial Equipment: Vibration monitoring, tilt alarm, equipment attitude monitoring

- Handheld Devices: Stylus pens, handheld scanners, portable testing instruments

- Others: Asset tracking tags, fall detection devices

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> Positioning: Consumer-grade low-power 6-axis IMU with built-in hardware motion recognition and compact size. Not automotive qualified, not suitable for high-temperature automotive applications.