Bosch Sensortec


Smart sensor combining accelerometer and fusion software

The BHA250B is a small, low-power smart sensor, which is specifically designed to enable always-on motion sensing and data processing. The smart sensor combines an integrated 3-axis accelerometer with a microcontroller. The sensor contains pre-installed fusion software and specific algorithms that enable always-on motion sensing. Thus, BHA250B is perfectly suited for applications such as smartphones, wearables or any other application that requires highly accurate, real-time motion data at a very low power consumption level.

Technical data

Parameter Technical data
Package dimensions
Technical data
2.2 x 2.2 x 0.95mm³
Temperature ranges
Technical data
-40 °C ... +85 °C
Supply voltage (VDDIO)
Technical data
1.6 V … 3.3 V
Supply voltage (VDD)
Technical data
1.62 V ... 3.6 V
Bosch Sensortec "fuser core"
Technical data
32-bit floating-point ARC EM4 MCU running at 10 MHz
1.6 DMIPS/MHz performance, 3.41 CoreMarks/MHz
96 kByte ROM, 48 kByte shared RAM for FIFO, features & extension
optimized for ultra-low power sensor data fusion
Typ. current consumption
- eCompass @100Hz ODR¹
- Hub+Acc @100 Hz ODR
- Activity recognition
- Significant motion
- Step detector
- Suspend mode
Technical data

630 μA
430 μA
200 μA
100 μA
100 μA
11 μA
Sensor fusion performance
- Static accuracy¹
- Dynamic accuracy¹
- Calibration time²
- Orientation stabilization time¹⁺³
- Step counting error
- Activity recognition accuracy
Technical data

[Head., Pitch, Roll] = 7, 2, 2 Degrees
[Head., Pitch, Roll] = 15, 7, 7 Degrees
<2 seconds
0.2 seconds
Precision: 85...97%⁶ Recall: 83...95%⁶
Implemented Sensor Types⁴ with integrated Accel only
Technical data
Accelerometer, step counter, step detector, significant motion, tilt detector, pickup gesture, wake up gesture, glance gesture, activity recognition of standing, running, biking, in vehicle
Implemented Sensor Types⁴ with attached magnetometer
Technical data
Gravity, linear acceleration, geomagnetic field, Magnetic field, Magnetic field uncalibrated, orientation vector, rotation vector, geomagnetic rotation vector

¹ With attached Magnetometer
² Determined by Magnetometer calibration time
³ Time from dynamic to static accuracy

⁴ Full Android sensor stack
⁵ False positives <9 counts within 5 minutes while driving
⁶ Dependent on activity


For new designs we recommend to use BHA260AB.



Woman taking a picture of New York City

Smartphones & tablets

Did you know that you most likely have a Bosch MEMS sensor in your pocket? More than every second smartphone and tablet worldwide contains at least one of these tiny helpers. Bosch MEMS sensors stabilize images, detect gestures and activities, and count your steps.

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The BSEC software is only available for download after accepting the software license agreement:

BSEC license agreement

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