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LSM303CTR Fiches technique(PDF) 34 Page - STMicroelectronics

No de pièce LSM303CTR
Description  Ultra-compact high-performance eCompass module: 3D accelerometer and 3D magnetometer
PDF  53 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LSM303CTR Fiches technique(HTML) 34 Page - STMicroelectronics

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Register description
LSM303C
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DocID024975 Rev 2
ODR [2:0] is used to set power mode and ODR selection. All frequencies available are given
in the following table.
The BDU bit is used to inhibit the update of the output registers until both upper and lower
register parts are read. In default mode (BDU = ‘0’) the output register values are updated
continuously. When the BDU is activated (BDU = ‘1’), the content of the output registers is
not updated until both MSB and LSB are read which avoids reading values related to
different sample times.
8.5
CTRL_REG2_A (21h)
Accelerometer control register 2 (r/w)
Table 27. CTRL_REG2_A register
Table 28. CTRL_REG2_A register description
Table 25. ODR register setting
ODR2
ODR1
ODR0
ODR selection
0
0
0
Power down
0
0
1
10 Hz
0
1
0
50 Hz
0
1
1
100 Hz
1
0
0
200 Hz
1
0
1
400 Hz
1
1
0
800 Hz
1
1
1
N.A.
Table 26. Low-pass cutoff frequency in high-resolution mode (HR = 1)
HR
CTRL_REG2_A (DFC [1:0])
LP cutoff freq. [Hz]
1
00
ODR/50
1
01
ODR/100
1
10
ODR/9
1
11
ODR/400
-
DFC1
DFC0
HPM1
HPM0
FDS
HPIS2
HPIS1
DFC1 [1:0]
High-pass filter cutoff frequency selection: the bandwidth of the high-pass filter
depends on the selected ODR and on the settings of the DFC [1:0] bits
HPM [1:0]
High-pass filter mode selection. Default value: 00
“00” or “10” = normal mode
“01” = reference signal for filtering
“11” = not available
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