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AN4662 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN4662 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 43 page AN4662 Operating modes Table 7: Decimation filter bandwidth ODR[Hz] Decimation filter cutoff frequency [Hz] 10/50 66 100 133 200 266 400 534 800 1090 For ODRs equal to or greater than 100 Hz the anti-aliasing bandwidth is guaranteed by the analog filter when BW_SCALE_ODR = 0. The digital low-pass filter can be enabled by setting the HR bit to 1 in the CTRL1 register. When high-resolution mode is selected, the digital signal coming from the decimation filter is additionally low-pass filtered and bandwidth is selected by the DFC[1:0] bits in CTRL2 register. Table 8: Digital low-pass filter bandwidth HR bit CTRL2 DFC[1:0] LP cutoff frequency [Hz] 1 00 ODR/50 1 01 ODR/100 1 10 ODR/9 1 11 ODR/400 2.6 Activity/Inactivity function The Activity/Inactivity recognition function allows reducing system power consumption and developing new smart applications. When the Activity/Inactivity recognition function is activated, the LIS2HH12 is able to automatically decrease the sampling rate to 10 Hz, increasing the ODR and bandwidth as soon as the wake-up interrupt event has been detected. With this feature the system may be efficiently switched from low-power consumption to full performance and vice-versa depending on user-selectable acceleration events, thus ensuring power saving and flexibility. The Activity/Inactivity recognition function is activated by writing the desired threshold in ACT_THS (1Eh); the threshold is represented by 7 bits and it is applied to a positive and negative direction. The high-pass filter is automatically enabled. Table 9: Activity/Inactivity control registers Register Resolution [LSB] ACT_THS Full Scale / 128 [mg] ACT_DUR 8/ODR [s] DocID027579 Rev 1 11/43 |
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