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  • Author:Ella Cai
  • Release on:2017-06-27
In August Bosch Sensortec will put out to distribution a family of MEMS acceleration sensors  specifically designed for motion and fitness tracking in wearables.

They include an optimized step counter for wearables integrated directly in the sensor, with no additional external microcontroller required.

Typical applications for the BMA456 and BMA423 include step counting in wearables such as fitness bands. The sensors can also be used for advanced gesture recognition, such as tilting of the wrist, and can detect activities like running, walking and standing still.

The BMA456 provides the highest performance and accuracy of the family, with 16-bit resolution, noise of only 120 μg/√Hz, and a total offset over its lifetime of only 20 mg. Temperature Coefficient of Offset (TCO) is ±0.3 mg/K, ensuring activity tracking remains accurate under all conditions.

The new Bosch acceleration sensors are housed in compact packages measuring 2.0 x 2.0 mm. The BMA456 has a very low height of only 0.65 mm, which makes this sensor easy to design into space-constrained wearable applications such as fitness trackers, smartwatches, and hearables.

Power consumption of the step counter is typically less than 30 μA. The sensors can be used to put wearables into sleep mode even during step-counting, thereby helping to reduce overall power consumption.