Smart sensor: BHI385
Precise. Extended-g range. Self-learning.
BHI385
Programmable AI sensor with extended-g range
The BHI385 from Bosch Sensortec is a fully programmable, high-performance Inertial Measurement Unit (IMU) designed for demanding motion tracking in sports, fitness, and gaming applications. With an extended measurement range of ±28 g, it accurately detects even the most dynamic movements, making it ideal for fitness trackers, smartwatches, and other wearables.
This compact system integrates a gyroscope, accelerometer, 32-bit microprocessor, and embedded AI software into one device, built on Bosch’s proven IMU platform. Its self-learning AI automatically adapts to new motion patterns without requiring manual intervention. Thanks to robust on-chip processing, developers can run custom machine learning models directly on the sensor. With Motion AI Studio, models can be easily deployed to enable personalized coaching, sport-specific feedback, or gesture-based interfaces.
The BHI385 comes in a compact 20-pin LGA package measuring just 2.5 × 3 × 0.95 mm³, allowing for seamless integration into space-constrained wearable designs.
Technical data
| Parameter | Technical data |
|---|---|
|
Parameter
Package dimensions (typ.)
|
Technical data
2.5 x 3.0 x 0.95mm³
|
|
Parameter
Current consumption
Fuser2 (running CoreMark)
|
Technical data
950 μA 2.8 mA 1.2 mA 1.0 mA 8 μA |
|
Parameter
Digital resolution
|
Technical data
Accelerometer (A): 16-bit
Gyroscope (G): 16-bit |
|
Parameter
Measurement ranges
(* at Full Scale ±32g, the maximum measurable acceleration is typically ±28g) |
Technical data
(A): ±4, ±8, ±16 g, ±28g*
(G): ±125°/s, ±250°/s, ±500°/s, ±1000°/s, ±2000°/s |
|
Parameter
Output data rates (selectable)
|
Technical data
(A): 12.5Hz … 1.6KHz
(G): 12.5 Hz ... 6.4 kHz |
|
Parameter
Offset soldered, over life
|
Technical data
(A): ± 25 mg
(G): ± 0.5 °/s |
|
Parameter
TCO
|
Technical data
(A): ± 0.25 mg/K
(G): ± 0.015 °/s/K |
|
Parameter
Sensitivity Error
|
Technical data
(A): 0.4%
(G): 2% |
|
Parameter
Noise density (typ.)
|
Technical data
(A): 160 μg/√Hz (8g),
170 μg/√Hz (28g) (G): 0.007 °/s/√Hz (performance mode), 0.01 °/s/√Hz (normal mode) |
|
Parameter
Interface
|
Technical data
▶ Host interface configurable as SPI or I2C
▶ 2 secondary master interfaces one I²C interface one selectable SPI or I²C ▶ Up to 14 GPIOs |
|
Parameter
Power modes
|
Technical data
High perf. mode, normal mode, low power mode (LPM), suspend mode
|
|
Parameter
Memory
|
Technical data
256 kByte on-chip SRAM
|
|
Parameter
Temperature range
|
Technical data
-40 … +85 °C
|
|
Parameter
Supply voltage
|
Technical data
1.71 ... 3.6 V (VDD)
1.71 ... 1.89 V (VDDIO) |
