BMI270 – Bosch Sensortec Ultra-Low-Power 6-Axis Smart IMU

Product Overview

The BMI270 is an ultra-low-power 6-axis smart inertial measurement unit (IMU) manufactured by Bosch Sensortec. It is designed for wearable, hearable, IoT, handheld, gesture-control, activity-tracking, and low-power motion-sensing applications.

The device integrates a 16-bit 3-axis accelerometer and a 16-bit 3-axis gyroscope in a compact LGA package. Bosch describes the BMI270 as an ultra-low-power smart IMU optimized for wearable and hearable applications, combining precise acceleration and angular-rate measurement with intelligent on-chip motion-triggered interrupt features. 

The BMI270 also includes advanced embedded features such as step counting, activity recognition, wrist gesture recognition, tap detection, motion detection, and no-motion detection, helping reduce system power consumption by allowing the host processor to sleep until a relevant motion event occurs.

Part Number Breakdown

Competitive Advantages

✔ 6-axis smart IMU with 3-axis accelerometer + 3-axis gyroscope

✔ 16-bit digital accelerometer and 16-bit digital gyroscope

✔ Accelerometer ranges: ±2g / ±4g / ±8g / ±16g

✔ Gyroscope ranges: ±125 / ±250 / ±500 / ±1000 / ±2000 dps

✔ Optimized for wearable and hearable applications

✔ Intelligent on-chip motion-triggered interrupt features

✔ Embedded 2KB FIFO

✔ I²C and SPI host interfaces

✔ Compact 14-pin LGA, 2.5mm × 3.0mm package

✔ Suitable for activity tracking, gesture recognition, wake-on-motion, IoT sensors, and low-power motion products

Key Features

1. 6-Axis Accelerometer and Gyroscope Integration

The BMI270 integrates a 3-axis accelerometer and a 3-axis gyroscope in one compact MEMS device.

Benefits:

• Measures linear acceleration and angular rate
• Enables motion tracking and orientation sensing
• Reduces the need for separate accelerometer and gyro ICs
• Simplifies compact wearable and IoT hardware design

2. 16-Bit Digital Accelerometer

The built-in accelerometer provides 16-bit digital output and supports selectable ranges of ±2g, ±4g, ±8g, and ±16g. 

Benefits:

• ±2g for tilt and activity sensing
• ±4g / ±8g for general motion tracking
• ±16g for impact, shock, and high-dynamic movement detection
• Software-configurable range for different product requirements

3. 16-Bit Digital Gyroscope

The gyroscope supports selectable ranges of ±125 dps, ±250 dps, ±500 dps, ±1000 dps, and ±2000 dps. 

Benefits:

• Low-range settings for fine orientation tracking
• High-range settings for fast rotational movement
• Suitable for gesture recognition, gaming, and wearable motion tracking
• Enables sensor fusion with accelerometer data

4. Ultra-Low-Power Smart IMU Design

Bosch positions the BMI270 as an ultra-low-power smart IMU optimized for wearable and hearable applications. 

Benefits:

• Suitable for battery-powered products
• Supports always-on motion sensing
• Helps extend wearable and hearable battery life
• Enables event-driven wake-up instead of continuous host polling

5. Intelligent On-Chip Motion Features

The BMI270 includes embedded motion-triggered features and wearable-oriented functions such as activity recognition, step counting, gesture recognition, tap detection, motion detection, and no-motion detection.

Benefits:

• Reduces host processor workload
• Enables low-power activity tracking
• Supports wrist-worn and hearable user interfaces
• Helps shorten firmware development time

6. 2KB FIFO Buffer

Bosch notes that the BMI270 includes a 2KB FIFO, allowing sensor data to be buffered before host readout. 

Benefits:

• Reduces MCU wake-up frequency
• Supports burst data transfers
• Helps lower total system power consumption
• Useful for wearable and battery-powered sensor systems

7. I²C and SPI Digital Interfaces

The BMI270 supports standard I²C and SPI host interfaces. DigiKey lists the output type as I²C / SPI for the BMI270. 

Benefits:

• Easy integration with MCUs and SoCs
• I²C supports low-pin-count sensor networks
• SPI supports faster sensor data transfer
• Suitable for both compact wearables and embedded IoT systems

8. Compact 14-Pin LGA Package

The BMI270 is supplied in a compact 14-pin LGA package, with Bosch and distributor data listing a 2.5mm × 3.0mm footprint. 

Benefits:

• Very small PCB footprint
• Suitable for wearables and hearables
• Compatible with automated SMT assembly
• Good fit for dense IoT and consumer electronics layouts

Applications

Wearables

• Smart watches
• Fitness trackers
• Smart bands
• Health monitoring devices
• Activity tracking devices

Hearables

• True wireless stereo earbuds
• Gesture-controlled headphones
• Motion-aware audio devices
• Low-power wearable audio products

IoT and Smart Devices

• Smart home sensors
• Battery-powered motion nodes
• Remote monitoring devices
• Asset movement detection
• Wake-on-motion IoT systems

Gesture and Activity Recognition

• Wrist gesture detection
• Tap detection
• Step counting
• Activity recognition
• Motion/no-motion detection

Consumer Electronics and Handheld Devices

• Handheld controllers
• Gaming accessories
• Portable electronics
• Smart remote controls
• Motion-based user interfaces