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Bosch Sensortec
Enhanced measurement range. Voice activity detection. Power efficient.

Inertial Measurement Unit: BMI423

The BMI423 Inertial Measurement Unit is designed for always-on applications like wearables, hearables, and robotics devices. It delivers enhanced robustness and precision, combining an extended measurement range with exceptionally low power consumption.

Experience intelligent Voice Activity Detection (VAD) that significantly conserves power and boosts privacy by activating microphones only when needed.

Its capabilities include an extended acceleration range of up to ±32g and a gyroscope range of up to ±4000 dps – double that of its predecessor. This allows the BMI423 to capture even the most dynamic movements with precision. Whether analyzing a golf swing, a tennis stroke, or intricate robotic arm movements, it provides accurate results where conventional sensors reach their limits.

This powerful sensor packs advanced functionality into a compact 2.5 x 3.0 x 0.83 mm³ footprint, ideal for smart, energy-efficient devices.

User interface features in hearables

User interface features in wearables

Motion control in robotics

Technical data

Package dimensions (typ.)
2.5 x 3.0 x 0.83 mm³
Digital resolution
Accelerometer (A): 24-bit
Gyroscope (G): 24-bit
Measurement ranges
A: ±2, ±4, ±8, ±16, ±32 g
G: ±125°/s, ±250°/s, ±500°/s, ±1000°/s, ±2000°/s, ±4000°/s
Output data rates (selectable)
12.5 Hz ... 6.4 kHz
Offset soldered, over life
(A): ± 35 mg
(G): ± 0.6 °/s
TCO
(A): ± 0.25 mg/K
(G): ± 0.011 °/s/K
Sensitivity Error
(A): 0.25%
(G): 0.5%
Noise density (typ.)
(A): 90 µg/√Hz (≤8g)
120 µg/√Hz (≥16g)
(G): 0.0055 °/s/√Hz
Current consumption (high performance mode, A+G)
660 µA
Current consumption (low power mode, A+G)
322 µA
Current consumption (suspend mode, A+G)
13.5 µA
Interface
I3C, I²C and SPI
2 Interrupt Pins
Power modes
High perf. mode, normal mode, low power mode (LPM), suspend mode
FIFO
4 KB on-chip FIFO data buffer
Temperature range
-40 … +85 °C
Supply voltage
1.62 ... 3.63 V (VDD)
1.08 ... 3.63 V (VDDIO)
Interrupts
Activity recognition
Motion detection
Step detection
Plug ’n’ play step counter
Single/double/triple tap detection
Voice activity detection
Wrist wear wake-up
Wrist gesture detection

Documents

BST-BMI423-FL000

Flyer

BST-BMI423-FL000

BST-BMI423-SF000

Shuttle board flyer

BST-BMI423-SF000

Applications and solutions

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