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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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BMA255 датащи(PDF) 34 Page - Bosch Sensortec GmbH |
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BMA255 датащи(HTML) 34 Page - Bosch Sensortec GmbH |
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34 / 119 page  BMA255 Data sheet Page 34 BST-BMA255-DS004-05 | Revision 1.2 | August 2014 Bosch Sensortec © 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. 4.7.7 Orientation recognition The orientation recognition feature informs on an orientation change of the sensor with respect to the gravitational field vector ‘g’. The measured acceleration vector components with respect to the gravitational field are defined as shown in figure 9. Figure 9: Definition of vector components Therefore, the magnitudes of the acceleration vectors are calculated as follows: acc_x = 1g x sin x cos acc_y = −1g x sin x sin acc_z = 1g x cos acc_y/acc_x = −tan Depending on the magnitudes of the acceleration vectors the orientation of the device in the space is determined and stored in the three (0x0C) orient bits. These bits may not be reset in the sleep phase of low-power mode. There are three orientation calculation modes with different thresholds for switching between different orientations: symmetrical, high-asymmetrical, and low-asymmetrical. The mode is selected by setting the (0x2C) orient_mode bits as given in Table 13. Table 13: Orientation mode settings (0x2C) orient_mode Orientation Mode 00b symmetrical 01b high-asymmetrical 10b low-asymmetrical 11b symmetrical |
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