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AN3308 数据表(PDF) 22 Page - STMicroelectronics |
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AN3308 数据表(HTML) 22 Page - STMicroelectronics |
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22 / 52 page ![]() Inertial interrupt AN3308 22/52 Doc ID 18198 Rev 1 Figure 7. Free-fall, wake-up interrupt generator The threshold module which is used by the system to detect any free-fall or inertial wake-up event is defined by the INT1_THS register. The threshold value is expressed over 7 bits as an unsigned number and is symmetrical around the zero-g level. XH (YH, ZH) is true when the unsigned acceleration value of the X (Y, Z) channel is higher than INT1_THS. Similarly, XL (YL, ZL) low is true when the unsigned acceleration value of the X (Y, Z) channel is lower than INT1_THS. Refer to Figure 8 for more details. Figure 8. FF_WU_CFG high and low |
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