Bosch Sensortec

Category: Motion and Position Sensors

BHI385 - Accelerometer, Gyroscope Sensor I2C, SPI Output

Bosch BHI385 Smart Programmable AI IMU – A compact 6-axis inertial measurement unit with integrated AI and a 32-bit programmable microcontroller for always-on motion sensing, activity recognition, and gesture detection. Ideal for wearables, AR/VR, and IoT devices requiring ultra-low power intelligent motion processing.

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

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