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AN2847 bảng dữ liệu(PDF) 18 Page - STMicroelectronics

tên linh kiện AN2847
Giải thích chi tiết về linh kiện  This document provides application information for the low-voltage 3-axis digital output
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High pass filter
AN2847
18/31
Doc ID 15136 Rev 2
4.1.1
Normal mode
In this configuration the high-pass filter can be reset by reading the HP_FILTER_RESET
register, instantly matching the output data to the input acceleration.
Figure 6.
HP_FILTER_RESET readings
4.1.2
Reference mode
In Reference mode 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’s
complement representation and the value of 1LSB of these 7-bit registers depends on the
selected full scale (
Table 14).
Table 13.
High-pass filter cut-off frequency configuration
HPcoeff2,1
ft [Hz]
Data rate = 50 Hz
ft [Hz]
Data rate = 100 Hz
ft [Hz]
Data rate = 400 Hz
ft [Hz]
Data rate = 1000 Hz
00
1
2
8
20
01
0.5
1
4
10
10
0.25
0.5
2
5
11
0.125
0.25
1
2.5
Table 14.
Reference mode LSB value
Full scale
Reference mode LSB value (mg)
2~16
4~31
8~63



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