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LSM303C 数据表(PDF) 21 Page - STMicroelectronics |
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LSM303C 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 53 page  DocID024975 Rev 2 21/53 LSM303C Functionality 53 Figure 7. FIFO multiple read 4.3 Activity/Inactivity function The Activity/Inactivity recognition function allows reducing the power consumption of the accelerometer block in order to supply other smart applications. When the Activity/Inactivity recognition function is activated, accelerometer is able to automatically go to 10 Hz sampling rate and to wake up as soon as the interrupt event has been detected, increasing the output data rate and bandwidth. With this feature the system may be efficiently switched from/to low-power mode to full performance depending on user-selectable positioning and acceleration events, thus ensuring power saving and flexibility. The Activity/Inactivity recognition function is activated by writing the desired threshold in the ACT_THS_A register. The high-pass filter is automatically enabled. Table 9. Activity/Inactivity function control registers When the acceleration becomes smaller than the threshold for at least (8 ACT_DUR +1)/ODR time, the CTRL_REG1_A (ODR [2:0]) bits of CTRL_REG1_A are bypassed (Inactivity) and internally set to 10 Hz (ODR [2:0] = 001), but the content of the CTRL_REG1_A (ODR [2:0]) bits are left untouched. When the acceleration becomes bigger than the threshold (ACT_THS_A), CTRL_REG1_A is restored immediately (Activity). Once the Activity/Inactivity detection function is enabled, it will be applied to the INT_XL pin by setting the CTRL_REG3_A (INT_XL_INACT) bit to ‘1’. To disable the Activity/Inactivity detection function, set the content of ACT_THS_A register to 00h. 4.4 Factory calibration The IC interface is factory calibrated for sensitivity (LA_So, M_GN), Zero-g level (LA_TyOff) and Zero-gauss level (M_TyOff). The trim values are stored inside the device in non-volatile memory. Anytime the device is turned on, the trim parameters are downloaded into the registers to be used during active operation. This allows using the device without further calibration. x,y,z OUT_Z_A Read #1 (2C-2D) (2A-2B) OUT_Y_A (28-29) OUT_X_A x,y,z Read #n OUT_Z_A (2C-2D) (2A-2B) OUT_Y_A (28-29) OUT_X_A Register LSB value ACT_THS_A Full Scale / 128 [mg] ACT_DUR_A 8/ODR [s] Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. Downloaded from Arrow.com. |
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