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AN3308 Fiches technique(PDF) 16 Page - STMicroelectronics

No de pièce AN3308
Description  This document describes the low-voltage 3-axis digital output linear MEMS accelerometer provided in an LGA package
PDF  52 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3308 Fiches technique(HTML) 16 Page - STMicroelectronics

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High-pass filter
AN3308
16/52
Doc ID 18198 Rev 1
4.1.1
Normal mode
In this configuration the high-pass filter can be reset reading the reference register, instantly
deleting the DC component of the acceleration.
Figure 3.
HP_FILTER_RESET readings
4.1.2
Reference mode
In this configuration the output data is calculated as the difference between the input
acceleration and the content of the reference register. This register is in 2’ complement
representation and the value of 1 LSB of these 7-bit registers depends on the selected full
scale (Table 9).
Table 8.
Low power mode - high-pass filter cut-off frequency [Hz]
HPC
ft [Hz]
@ 1Hz
ft [Hz]
@ 10Hz
ft [Hz]
@ 25Hz
ft [Hz]
@ 50Hz
ft [Hz]
@
100Hz
ft [Hz]
@
200Hz
ft [Hz]
@
400Hz
ft [Hz]
@ 1.6
kHz
ft [Hz]
@ 5 kHz
00
0.02
0.2
0.5
1
2
4
8
32
100
01
0.008
0.08
0.2
0.5
1
2
4
16
50
10
0.004
0.04
0.1
0.2
0.5
1
2
8
25
11
0.002
0.02
0.05
0.1
0.2
0.5
1
4
12
Table 9.
Reference mode LSB value
Full scale
Reference mode LSB value (mg)
2~16
4~31
8~63



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