STEVAL-MKI091V1 STMicroelectronics, STEVAL-MKI091V1 Datasheet - Page 27

• Manufacturer Part Number: STEVAL-MKI091V1
• Description: DEMO BOARD FOR LIS331DLM
• Manufacturer: STMicroelectronics
• Series: MEMS, nanor

Specifications of STEVAL-MKI091V1

• Sensor Type: Accelerometer, 3 Axis
• Sensing Range: ±2g, 4g, 8g
• Interface: I²C, SPI
• Sensitivity: 64LSB/G, 32LSB/g, 16LSB/g
• Embedded: No
• Utilized Ic / Part: LIS331DLM
• Acceleration: 2 g, 4 g, 8 g
• Sensing Axis: Triple Axis
• Interface Type: I2C, SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: LIS331DLM
• Other names: 497-10491

LIS331DLM
Table 22.
BOOT bit is used to refresh the content of internal registers stored in the flash memory
block. At the device power up the content of the flash memory block is transferred to the
internal registers related to trimming functions to permit a good behavior of the device itself.
If for any reason the content of trimming registers was changed it is sufficient to use this bit
to restore correct values. When BOOT bit is set to ‘1’ the content of internal flash is copied
inside corresponding internal registers and it is used to calibrate the device. These values
are factory trimmed and they are different for every accelerometer. They permit a good
behavior of the device and normally they have not to be changed. At the end of the boot
process the BOOT bit is set again to ‘0’.
Table 23.
HPCF[1:0]. These bits are used to configure high-pass filter cut-off frequency f
given by:
The equation can be semplified to the following approximated equation:
Table 24.
HPen1
HPCF1,
HPCF0
HPcoeff2,1
HPM1
00
01
10
11
0
0
1
CTRL_REG2 description (continued)
High-pass filter mode configuration
High-pass filter cut-off frequency configuration
High pass filter enabled for Interrupt 1 source. Default value: 0
(0: filter bypassed; 1: filter enabled)
High pass filter cut-off frequency configuration. Default value: 00
(00: HPc=8; 01: HPc=16; 10: HPc=32; 11: HPc=64)
Data rate = 50 Hz
HPM0
0
1
0
f
0.125
t
0.25
0.5
[Hz]
1
Doc ID 15102 Rev 4
f
t
Normal mode (reset reading HP_RESET_FILTER)
Reference signal for filtering
Normal mode (reset reading HP_RESET_FILTER)
=
f
ln
t
⎛
⎝
=
1
--------------------- -
6
–
⋅
----------- -
HPc
Data rate = 100 Hz
f
1
HPc
s
⎞
⎠
⋅
f
t
0.25
High-pass filter mode
0.5
------
2π
[Hz]
f
2
1
s
Register description
Data rate = 400 Hz
f
t
[Hz]
8
4
2
1
t
which is
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