October 2008 Rev 2 1/8
UM0537
User manual
STEVAL-MKI019V1
demonstration kit for the LIS302SG
Introduction
The STEVAL-MKI019V1 is a demonstration kit designed to provide the user with a
complete, ready-to-use platform for the evaluation of the LIS302SG. The LIS302SG is a low-
power 3-axis linear capacitive accelerometer that includes a sensing element and an IC
interface capable of taking information from the sensing element and providing an analog
signal to an external application.
In addition to the MEMS sensor, the system includes a linear voltage regulator and a rail-to-
rail low noise quad amplifier configured as a non-inverting buffer, making both direct sensor
outputs and buffered sensor outputs available to the user.
The kit also provides an easy way to control the Power-down and Self-test pins.
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Demonstration kit description UM0537
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1 Demonstration kit description
The block diagram of the demonstration kit and the layout of the board are shown
respectively in Figure 1 and Figure 2, while the full board photo of is provided in Figure 3.
Figure 1. Demonstration board block diagram
Figure 2. Top silk-screen for STEVAL-MKI019V1 board layout
Voltage
Regulator MEMS
Sensor
3.3V
Voutxyz
Sensor
Output
VXYZ
Buffered
Output
Output
Buffer
PD
ST
PS
PSR
S1
S0
MUX
Output
UM0537 Demonstration kit description
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Figure 3. STEVAL-MKI019V1 board photograph
1.1 Operating the demonstration kit
To operate the demonstration kit it is necessary to supply it through the connector marked
J1 (PS) with a dc voltage between 3.7 V and 18 V. The suggested supply voltage is 5 V. The
typical current consumption of the LIS302SG MEMS sensor is 0.65 mA, while the typical
current consumption of the whole board is in the range of 6 mA.
The voltage applied to the board is then regulated through a linear voltage regulator which
supplies the MEMS sensor at 3.3 V.
The outputs (Voutx, Vouty and Voutz) of the LIS302SG linear accelerometer are band limited
through the use of three 4.7 nF capacitors (Cx, Cy and Cz) which, together with the sensor’s
32 kΩ output resistor Rout, create a single-pole low-pass filter with a cut-off frequency of
approximately 1 kHz.
If a different cut-off frequency ft is required, the user should replace the above capacitors
with components having values derived using the following formula:
Equation 1
As mentioned above, the STEVAL-MKI016V1 makes both the direct sensor outputs and the
buffered signals available through two separate connectors: J4 (Sensor Output) and J3
(Buffered Output). Specifically, the three channels are made available from the left to right of
the board in the order Voutx, Vouty and Voutz.
The buffering of the sensor outputs is achieved through the use of a rail-to-rail low-noise
quad-amplifier configured as a non-inverting buffer.
ref1
ref2
ref3
Cxyx,,() 1
2πRout ft
⋅⋅ ⋅
-----------------------------------=
Demonstration kit description UM0537
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1.2 Driving Power-down and self-test signals
The board allows the control of the Power-down and Self-test signals through the use of test
points (marked J3 and J7, respectively) and jumpers.
1.2.1 Power-down
When the jumper is removed from J3 (Power-down, Figure 3, ref1) the MEMS sensor is in
normal mode, otherwise it is in power-down mode.
1.2.2 Self-test
When the jumper is removed from J7 (Self-Test, Figure 3, ref2) the self-test feature is
disabled. In order to activate the self-test feature the jumper must be inserted into J7.
When this function is activated the seismic mass of the sensor is moved by means of an
electrostatic test-force, simulating a definite input acceleration. Under these conditions the
sensor outputs will exhibit a voltage change in their DC levels as specified in the datasheet
of the LIS302SG sensor.
1.2.3 Multiplexed output
The device provides an embedded multiplexer to allow the redirection of either the analog
output signals Voutx, Vouty
, and Voutz or of an auxiliary input signal onto a single pin for
operation with a single channel A/D converter. Output selection can be achieved through
jumpers J6 and J9 (S0 and S1, Figure 3, ref3). Refer to Ta b l e 1 for MUX configuration.
Table 1. MUX I/O table
S1 pin S0 pin MUX status
0 0 Vout=Vout X
0 1 Vout=Vout Y
1 0 Vout=Vout Z
1 1 Vout=Aux_in
UM0537 Schematic diagram
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2 Schematic diagram
The schematic diagram of the STEVAL-MKI019V1 demonstration kit is shown in Figure 4.
Figure 4. Schematic diagram for STEVAL-MKI019V1 board
1
2
Power_Supply
J1
88
77
66
55
2
2
3
3
4
4
1
1
LE
U2
2. 2uF
C1
100n F
C2
VD D
1
2
3
J4
VXq
VYq
VZq
VO UT1
1
V-1
2
V+1
3
VCC
4
V+2
5
V-2
6
VO UT2
7VOUT3 8
V-3 9
V+3 10
GND 11
V+4 12
V-4 13
VOUT4 14
TS924
U3
Vo ut Xq
Vo ut Yq Vo ut Zq
VXq
VYq VZ q
1
2
3
J5
Vo ut Zq
Vo ut Yq
Vo ut Xq
TS924 rail to rail Low
nois e
Quad operational
1
2
PSR
J2
Buffered O utput
Sens or Ou tput
VDD
Vo ut _Mux
Vo ut _MuxBu f f
Rsvd
1
Rsvd 14
Vdd 13
Aux_ in 12
Vo ut _mux 11
GND 10
Vo ut Z 9
Vout Y 8
Vou tX
7
PD
6
ST
5
S1
4
S0
3
Rsvd
2
Motion Sens or
U1
Aux_ In
Vout _Mux
Vout _MuxBuff
Vout _Mux
Vout _MuxBu ff
1
2
3
J8
4. 7nF
Cy
4. 7nF
Cz
Vout Yq
Vout Zq
1
2
J7
1
2
J3
10K
R2
10K
R1
10K
R3
10K
R4
1
2
J9
1
2
J6
VDD
VDD
100nF
C4
4. 7nF
Cx
Vou tXq
10uF
C3
Bill of material UM0537
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3 Bill of material
The bill of material for STEVAL-MKI019V1 demonstration kit is provided in Ta bl e 2 .
Table 2. Bill of material
Item Quantity Reference Value
1 2 C2,C4 100 nF
2 1 C1 2.2 µF
3 3 Cx,Cy,Cz 4.7 nF
4 1 C3 10 µF
5 4 R1, R2, R3, R4 10 kΩ
6 6 J1,J2,J3,J6,J7,J9 CON2
7 3 J4,J5,J8 CON3
8 1 U1 LIS302SG
9 1 U2 LE33
10 1 U3 TS924
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