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Bosch BHI385 Smart Programmable AI IMU

Bosch BHI385 Smart Programmable AI Inertial Measurement Unit (IMU) combines a 6-axis IMU (3-axis accelerometer and 3-axis gyroscope) with a powerful 32-bit programmable microcontroller and integrated AI capabilities. Designed for always-on sensor applications, the Bosch BHI385 enables efficient, on-device machine learning and motion processing without burdening the host processor. The sensor supports pre-trained algorithms for activity recognition, context awareness, and gesture detection, while also allowing developers to deploy custom models using Bosch’s AI Studio.

With ultra-low power consumption and a compact package, the BHI385 is ideal for wearables, hearables, AR/VR devices, and other portable electronics that demand intelligent motion sensing and contextual awareness. Integrated sensor fusion and AI processing make the Bosch BHI385 a versatile solution for next-generation smart devices.

Features

  • Fully programmable
  • Extended accelerometer range
  • Advanced software
  • Easy deployment
  • Precise AI algorithm
  • Power efficient/low power consumption

Applications

  • Wearables
  • Sports activity tracking/evaluation
  • Fitness equipment and smart clothing
  • Head-mounted devices
  • Impact detection
  • Human-machine interactions

Specifications

  • 2.5mm x 3.0mm x 0.95mm size
  • Current consumption
    • Fuser2 (running CoreMark)
      • 950μA in long run mode at 20MHz
      • 2.8mA in turbo mode at 50MHz
    • Sensor Fusion (Hub+IMU) operation (calculating Game Rotation Vector)
      • 1.2mA for the 800Hz ODR
      • 1.0mA for the 100Hz ODR
    • 8μA standby current
  • Digital resolution
    • 16-bit accelerometer
    • 16-bit gyroscope
  • Measurement ranges
    • ±4g, ±8g, ±16g, and ±28g for the accelerometer (at full scale ±32g, the maximum measurable acceleration is typically ±28g)
    • ±125°/s, ±250°/s, ±500°/s, ±1000°/s, and ±2000°/s for the gyroscope
  • Selectable output data rates
    • 12.5Hz to 1.6KHz for the accelerometer
    • 12.5Hz to 6.4kHz for the gyroscope
  • Offset soldered, over life
    • ±25mg for the accelerometer
    • ±0.5°/s for the gyroscope
  • TCO
    • ±0.25mg/K for the accelerometer
    • ±0.015°/s/K for the gyroscope
  • Sensitivity error
    • 0.4% for the accelerometer
    • 2% for the gyroscope
  • Typical noise density
    • Accelerometer
      • 160μg/√Hz (8g)
      • 170μg/√Hz (28g)
    • Gyroscope
      • 0.007°/s/√Hz in performance mode
      • 0.01°/s/√Hz in normal mode
  • Interfaces
    • Host interface configurable as SPI or I2C
    • 2x secondary master interfaces - 1x I2C interface and 1x selectable SPI or I2C
    • Up to 14x GPIOs
  • High performance mode, normal mode, low power mode (LPM), and suspend mode
  • 256kByte on-chip SRAM memory
  • -40°Cto +85°C operating temperature range
  • Supply voltages
    • 1.71V to 3.6V for VDD
    • 1.71V to 1.89V for VDDIO

Additional Resources

Development Tools

Bosch BHI385 Shuttle Board 3.0

Compact evaluation platform designed to support the BHI385 smart sensor.

Learn Moreabout Bosch BHI385 Shuttle Board 3.0 View Productsrelated to Bosch BHI385 Shuttle Board 3.0

Bosch Application Board 3.1

Versatile and sensor-independent development platforms for evaluating various sensors.

Learn Moreabout Bosch Application Board 3.1 View Productsrelated to Bosch Application Board 3.1
Published: 2025-07-15 | Updated: 2025-11-14