Barometric pressure sensor for wearables and hearables
The BMP390 is able to measure height changes under 10 centimeters through improved resolution, and is 50 percent more accurate than its predecessor.
Bosch and NextNav collaborated on component specifications and system performance. Consistent high-accuracy indoors is accomplished by combining the BMP390 with NextNav’s Metropolitan Beacon System (MBS) z-axis service for three-dimensional location and positioning. The device’s advanced barometric pressure sensing can determine whether a user is walking up or down an incline, stairs or lifting weights.
The BMP390 is typically accurate to ±0.03 hPa with a typical absolute accuracy of ±0.5 hPa. The high level of accuracy is due to improvements in temperature stability, drift behaviour and noise. The sensor features high temperature stability across its operating temperature and pressure range of 0 to 65 °C and 700 to 1100 hPa respectively, with an average temperature coefficient offset (TCO) of ±0.6 Pa/K. Noise is 0.9 Pa typical, an improvement of 25 percent over its predecessor BMP380.
It measures 2.0 mm x 2.0 mm x 0.75 mm and has a typical power consumption of 3.2 μA at 1 Hz.
More information
https://www.bosch-sensortec.com/
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