STEVAL-MKI021V1 STMicroelectronics, STEVAL-MKI021V1 Datasheet - Page 12
![BOARD EVALUATION LIS331AL](/photos/9/18/91855/steval-mki021v1_sml.jpg)
STEVAL-MKI021V1
Manufacturer Part Number
STEVAL-MKI021V1
Description
BOARD EVALUATION LIS331AL
Manufacturer
STMicroelectronics
Series
MEMSr
Specifications of STEVAL-MKI021V1
Sensor Type
Accelerometer, 3 Axis
Sensing Range
±2g
Interface
Analog
Sensitivity
0.145 x Vdd = V/g
Voltage - Supply
3 V ~ 3.6 V
Embedded
No
Utilized Ic / Part
LIS331AL
Acceleration
2 g
Sensing Axis
Triple Axis
Output Type
Analog
Operating Voltage
18 V
Operating Current
6 mA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-8205
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-MKI021V1
Manufacturer:
STMicroelectronics
Quantity:
135
Application hints
4
12/16
Application hints
Figure 3.
Power supply decoupling capacitors (100 nF ceramic or polyester + 10 µF aluminum) should
be placed as near as possible to the device (common design practice).
The LIS331AL allows to band limit Voutx, Vouty and Voutz through the use of external
capacitors. The recommended frequency range spans from DC up to 2.0 kHz. In particular,
capacitors are added at output Voutx, Vouty, Voutz pins to implement low-pass filtering for
antialiasing and noise reduction. The equation for the cut-off frequency (f
filters is in this case:
Taking into account that the internal filtering resistor (R
kΩ , the equation for the external filter cut-off frequency may be simplified as follows:
The tolerance of the internal resistor can vary typically of
kΩ; thus the cut-off frequency will vary accordingly. A minimum capacitance of 2.5 nF for
C
Table 6.
load
PD
ST
(x, y, z) is required.
Digital signals
LIS331AL electrical connection
Filter capacitor selection, C
GND
2
3
4
1
5
Cut-off frequency
16 15 14
LIS331AL
6
(top view)
10 Hz
20 Hz
50 Hz
1 Hz
7
8
100nF
GND
f
t
=
10
13
12
11
9
------------------------------------------------------------------------ -
2π
f
t
Cload y
⋅
Cload z
Cload x
10
GND
=
R
µ
-------------------------------------- - Hz
C
F
out
load
load
⋅
5µF
(x,y,z)
(
C
1
x y z
load
Vdd
,
,
Optional
(
x y z
out
,
)
[
±
) has a nominal value equal to 32
20% within its nominal value of 32
,
]
)
Capacitor value
X
Vout z
Vout x
Vout y
250nF
100nF
0.5µF
5 µF
(Top view)
Direction of the
detectable
accelerations
t
) of the external
1
Pin 1 indicator
LIS331AL
Z
Y