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ADXL343 Tilt angle limit


We are using ADXL343 accelerometer for tilt measurement in our device. We use X, Y, Z values to calculate the tilt angle with gravity vector, by using its projection on the 3 axes. On one of our units, we are unable to get a tilt angle of less than 5 deg. We tried orienting the device in all directions, however the projection values are such that the angle doesn't go below 5 deg. We have a similar observation on another device too, with a limiting angle of 2 deg. We don't do offset calibration, as it's a portable device and may not always guarantee a deterministic orientation for obtaining zero-offset. We use full resolution for +/-2g range. Request your inputs to troubleshoot this issue. Thank you.


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