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AN4662 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN4662
Description  This document describes the low-voltage 3-axis digital output linear MEMS accelerometer provided
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4662 Datasheet(HTML) 11 Page - STMicroelectronics

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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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