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0-273-141-043 Datasheet(PDF) 52 Page - List of Unclassifed Manufacturers |
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0-273-141-043 Datasheet(HTML) 52 Page - List of Unclassifed Manufacturers |
52 / 55 page Data sheet BMA150 Triaxial, digital acceleration sensor Bosch Sensortec Rev. 1.5 Page 52 30 May 2008 © Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. time |a| Freefall threshold Evaluation duration INT low high Latched INT High-g threshold acceleration Hysteresis Reset INT Figure 30: Explanation of freefall and high-g detection. Please see explanation within the text. 9.3 Any motion detection The “any motion algorithm” can be used to detect changes of the acceleration. Thus it provides a relative evaluation of the acceleration signals. The criterion is kind of a gradient threshold of the acceleration over time. Thus one can distinguish between fast events with strong inertial dynamic (e.g. shock), instant changes of force balance (e.g. drop, tumbling) and even slight changes (e.g. touch of a mobile device). Due to a high bandwidth and a fast response MEMS device the BMA150 is capable to detect shock situations. The “any motion interrupt” or a high-g criterion setting can be used to give a shock alert. The phase shift between onset of mechanical shock and interrupt output is defined by the mechanical transfer function of the chassis and internal mounting interfaces (e.g. PDA shell) and the data output rate of the sensor IC (currently 330µsec, 100µsec under consideration). See also section 3.2.9. 9.4 Alert Mode Using the BMA150 it is possible to combine the “any motion criterion” with low-g and high-g interrupt logic to improve the reaction time for e.g. free-fall identification. See also sections 3.2.9 and 3.4.2. |
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