BMA550 Accelerometer | Bosch Sensortec

The BMA550 sensor for hearables makes a big wave against unwanted sound waves. The innovative accelerometer works as body sound sensor for sensing bone conductedvoice. The smart function “voice enhancement” filters out distracting noises during phone calls and amplifies your own voice.

Easy-to-integrate
Enhanced speech processing
Always-on low-power speech processing

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If you are interested in our acceleration sensor BMA550, please use our contact form.

Please be aware that we can only consider information requests for projects with a minimum lifetime quantity of 100,000 units and above.

Easy-to-integrate due to small size

Enhanced speech processing

Continuously usable due to always-on low-power speech processing

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Technical data

Package dimensions (typ.)

2 x 2 x 0.65 mm³

Digital Resolution

16 bit

Supply voltage VDDIO
Supply voltage VDD

1.08 … 3.6 V
1.71 … 3.6 V

Interface

TDM interface + I2C

Output data rate

Up to 48 kHz

Bandwidth

50 Hz … 2350 Hz

Noise (in low noise mode)

1.2 mg-rma @2350 Hz BW

Total Harmonic Distortion +Noise

0.25%

Power consumption

290 µA in low noise mode
104 µA in low power mode

FIFO

1kb

Interrupts

FIFO + Voice activity detection

Documents

Flyer

BST-BMA550-FL000

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Applications and solutions

Woman doing sports using hearables and smartwatch

Wearables

Sensor technology enhances the capabilities of hearables and provides manufacturers with innovative features including gesture and context recognition, speech processing and voice enhancement, as well as precise head orientation tracking.

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Hearables

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XR headsets and glasses

Our MEMS sensors power innovative solutions for XR devices, enhancing usability and natural interactions. They deliver low-latency motion tracking, fast response, and energy‑efficient performance — essential for today’s advanced head-worn devices. While inertial head tracking can suffer from drift, Bosch Sensortec technology supports sensor fusion approaches that combine IMU data with complementary signals (e.g., cameras or magnetometers) to improve accuracy.

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Other Accelerometers

BMA456

The BMA456 is an ultra-small, triaxial, low-g high performance acceleration sensor with digital interfaces. The sensor is suitable for low-power and demanding consumer electronics applications. It detects wrist tilt, tab/double tab and enables plug ’n’ play step counting especially in wearable devices.

More information

BMA400

The BMA400 is an ultra-low power acceleration sensor for wearables and smart home applications that need a long-lasting battery lifetime. The BMA400 draws ten times less current than existing accelerometers while delivering solid high performance.

More information

More sensors

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