About FAE_CA1

Hi, I just used my eval. board and BMI270 shuttle board that has BMM150 installed. From the Windows GUI SW plot below, it can be seen that BMM150 z axis data (in red color) doesn't go beyond +/-2500uT when I place a strong magnet nearby. After I remove the strong magnet, BMM150 goes back to normal immediately. By the way, the GUI SW uses BMM150 API/driver on the Github. Therefore, in theory when external magnet field is beyond BMM150 z axis +/-2500uT range, BMM150 z axis raw data should be fixed or clamped for saturation. However, if BMM150 z axis still outputs raw data when the external magnetic field is beyond +/-2500uT range and the API/driver still outputs values that are outside of +/-2500uT range, then BMM150 is still working but the performance is not guaranteed because each BMM150 is calibrated, trimmed and tested under +/-2500uT range in Bosch factory. Thanks. ... View more

Hi, Thanks for your inquiry. BMA456 has noise density of 120ug/rt(Hz). If you choose 25Hz output data rate (ODR) for example, then the bandwidth will be 10.12Hz. Then the noise level (1-sigma) = noise density * sqrt(1.22 * BW), where 1.22 is the coefficient of the internal low pass filter = 120ug/rt(Hz) * sqrt(1.22 * 10.12Hz) = 0.42mg. Then 3-sigma noise level = 3 * 0.42mg = 1.26mg = 0.00126g with 99.7% confidence range. So the BMA456 tilt resolution = arcsine(0.00126g/1g) = 0.07degrees. Therefore, BMA456 can detect 3 cases resolution (0.1/0.5/1.0degrees). If you choose 12.5Hz ODR with 5.06Hz bandwidth, then the tilt resolution will be even better. Thanks. Thanks. ... View more