With measurement ranges of ±32 g (accelerometer) and ±4000 degrees per second (gyroscope) — twice that of its predecessor — the BMI423 captures even the most dynamic movements. Whether analyzing sports, video games, or the movement of robotic arms, it delivers accurate results where conventional sensors reach their limits.
Smart motion features for the “always-on” generation
. Tailored to wearables and hearables, the BMI423 integrates voice activity detection (VAD) based on bone conduction sensing. The sensor detects when the user is speaking and activates the microphone only when needed, saving power and protecting privacy. Other integrated features, such as wrist gesture recognition, multitap detection, and step counting, allow the main processor to remain in sleep mode until required. This enables longer battery life in compact devices like smartwatches, headphones, and fitness trackers.
“The BMI423 demonstrates how Bosch Sensortec continues to combine high precision with intelligent power management,” said Stefan Finkbeiner, CEO of Bosch Sensortec. “This sensor brings high dynamic range motion capture and advanced sensor-integrated functions to the smallest and most efficient devices, making the next generation of wearables and hearables smarter than ever.”.
Performance and Integration:
The BMI423 features low noise levels of 5.5 mdps/√Hz (gyroscope) and 90 µg/√Hz (≤ 8 g) or 120 µg/√Hz (≥ 16 g) for the accelerometer. These figures, along with minimized temperature-dependent drift, ensure reliable performance even under demanding conditions. Despite its high performance, the sensor consumes only 25 µA during acceleration measurement. Engineers have access to flexible interfaces such as I3C®, I²C, and SPI for easy integration into modern platforms. Its compact 2.5 × 3 × 0.8 mm³ LGA package makes it ideal for space-constrained designs.
