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Bosch launches BMA400 low power accelerometer

Bosch Sensortec has launched its BMA400, a low power acceleration sensor for wearables and IoT applications.

Bosch says that the BMA400 draws ten times less current than existing accelerometers, while delivering solid high performance and extending battery lifetime – particularly on coin cell-powered devices.

The BMA400 acceleration sensor has also received a CES 2018 Innovation Award in the category Embedded Technologies.

Dr. Stefan Finkbeiner, CEO of Bosch Sensortec, said: “The BMA400 is the perfect solution for wearable and IoT applications that aim to significantly extend battery lifetime without compromising on performance. By substantially extending the battery replacement interval, the BMA400 gives the end-user improved reliability, ease of use and a greater peace of mind."

Bosch states that the sensor's measurement signal has precisely defined cutoff frequencies, making it very resistant to vibrations. Useful in IoT use cases, such as smart home security systems, the BMA400 should be able to distinguish between real alarm situations and false signals.

Designed to have an ultra-low current step counter at 4 µA and with intelligent power management features such as built-in activity recognition, the BMA400 aims to provide wearable devices like fitness bands and activity trackers with unprecedented battery life.

The small size of only 2.0 x 2.0 x 0.95 mm³ and the integrated plug and play step counter, aims to make the new BMA400 acceleration sensor easy to design into various applications.

With its built-in voltage regulator, Bosch says the BMA400 can deliver stable performance over a wide supply voltage range. It also offers flexible device tuning for power consumption, noise and output data rate parameters.

The BMA400 has a current consumption of 14 μA at highest performance, continuous measurement and a noise density of 220 μg/√Hz. This falls to just 1 μA and below in the ultra-low power self-wake-up mode. The sensor also includes a large FIFO of 1 KB.

The BMA400 will be available for OEMs and distributors starting in June 2018. C-samples for OEMS are available on demand.

Bethan Grylls

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