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By Rich Handley

Bosch Sensortec Unveils Low-Power Accelerometer for IoT, Wearables

Bosch Sensortec has announced that its BMA400 ultra-low-power MEMS acceleration sensor, designed for the Internet of Things (IoT) and wearable applications, is now available worldwide through distributors.

With low current consumption, embedded plug-and-play step counting and activity-recognition features, the BMA400 is built to extend the battery lifetime of wearables such as smart watches and fitness trackers, according to the company. It can wake up automatically when it detects motion, then return to sleep mode once the movement has ended, thereby avoiding the need to awaken the main application processor. This feature reduces battery consumption to extend charging intervals.

For IoT applications like indoor climate systems and security systems in smart homes, the BMA400 offers continuous measurement capabilities and always-defined bandwidth. It can avoid false alarms by distinguishing between genuine alarms like broken glass and false signals coming from random vibrations. Its low power consumption means fewer battery replacements.

The BMA400 contains a built-in voltage regulator and can provide stable performance across a wide voltage range. It offers flexible device tuning for power consumption, noise and output data rate (ODR) parameters. The unit has a current consumption of 14 μA and a noise density of 180 μg/√Hz. This drops to 1 μA and below in the device's ultra-low-power self-wake-up mode. Its small size (2 millimeters by 2 millimeters by 0.95 millimeter) and integrated plug-and-play step counter make the BMA400 suitable for designing into new types of wearables, such as watches and jewelry.

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