LIS331DLH STMicroelectronics, LIS331DLH Datasheet - Page 27

• Manufacturer Part Number: LIS331DLH
• Description: Board Mount Accelerometers DGTL OUTPT MTN SEN MEMS ULTRA LO PWR
• Manufacturer: STMicroelectronics

Specifications of LIS331DLH

• Sensing Axis: X, Y, Z
• Acceleration: 2 g, 4 g, 8 g
• Digital Output - Number Of Bits: 16 bit
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.16 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Digital Output - Bus Interface: I2C, SPI
• Shutdown: Yes
• Package / Case: LGA-16
• Output Type: Digital
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LIS331DLH
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 simplified to the following approximated equation:
Table 24.
HPen1
HPCF1,
HPCF0
HPcoeff2,1
00
01
10
11
HPM1
0
0
1
CTRL_REG2 description (continued)
High-pass filter mode configuration
High-pass filter cut-off frequency configuration
Data rate = 50 Hz
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)
f
0.125
t
0.25
0.5
[Hz]
1
HPM0
0
1
0
Doc ID 15094 Rev 3
Data rate = 100 Hz
f
t
Normal mode (reset reading HP_RESET_FILTER)
Reference signal for filtering
Normal mode (reset reading HP_RESET_FILTER)
=
f
f
t
0.25
ln
t
0.5
[Hz]
2
1
⎛
⎝
=
1
--------------------- -
6
–
⋅
----------- -
HPc
f
1
HPc
s
⎞
⎠
⋅
Data rate = 400 Hz
High-pass filter mode
------
2π
f
s
f
t
[Hz]
8
4
2
1
Register description
Data rate = 1000 Hz
t
f
t
which is
2.5
[Hz]
20
10
5
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