BMI270 | Bosch Sensortec | 6-axis IMU Inertial Measurement Unit (3-axis accelerometer + 3-axis gyroscope)

 Key Specifications

1. Composition: 16-bit 3-axis accelerometer + 16-bit 3-axis gyroscope

2. Accelerometer range: ±2g / ±4g / ±8g / ±16g (programmable)

3. Gyroscope range: ±125°/s ~ ±2000°/s (programmable)

4. Package: LGA, dimension 2.5 × 3.0 × 0.8 mm

5. Supply voltage: VDD 1.71V ~ 3.6V; VDDIO 1.2V ~ 3.6V

6. Operating temperature: -40℃ ~ +85℃

7. Communication interface: I2C / SPI, with auxiliary I2C for connecting external magnetometer and barometric pressure sensor

8. Power consumption: Typical 685μA in full operation mode; approx. 30μA for low-power motion detection

9. Built-in 2KB FIFO buffer; CRT gyroscope self-calibration, sensitivity error ±0.4% after soldering

10. Integrated plug-and-play step counter, optimized for wrist-worn devices

Functions

- Collect raw data of 3-axis acceleration and 3-axis angular velocity

- On-chip motion detection: Identify stationary / motion / significant motion, generate interrupt to wake up MCU

- Built-in step counting, activity recognition (walking, running, etc.) and gesture recognition

- CRT gyroscope self-calibration to compensate drift error caused by soldering

- Auxiliary I2C interface for external sensors and synchronized data acquisition

- Output basic data for attitude calculation, used for tilt, orientation and motion tracking

# Purpose

Detect motion, tilt, rotation and vibration of devices. It performs step counting and motion wake-up locally on the chip without continuous operation of the main controller, greatly reducing power consumption. It is a core MEMS motion sensor for wearable devices.

Applications

- Wearables: Smart watches, fitness bands, TWS earbuds, smart apparel

- AR/VR glasses, motion game controllers

- IoT devices, attitude detection
- Small robots, gimbal tilt detection, industrial equipment vibration monitoring