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How does the accelerometer auto-calibration work? Would it not require the precise orientation of the sensor in the gravitational field?
Q&A - webinar "In-sensor monitoring with intelligent MEMS sensors"
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The accelerometer calibration requires to keep the device stationary in at least 6 different orientations well spread in the 3D space, but no predetermined orientations specifically. X-axis up, x-axis down, y-axis up, y-axis down, z-axis up, z-axis down are easy-to-remember and optimally-spread orientations, but they are not required for the calibration to succeed.
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