STEVAL-MKI001V1
MEMS analog output evaluation board based on LIS3L02AS4
Data Brief
Features
2.4 V to 3.6 V single supply operation Low power consumption 2 g / 6 g user selectable full-scale 0.5 mg resolution over 100 Hz bandwidth Embedded self-test and power down Output voltage, offset and sensitivity ratiometric to the supply voltage High shock survivability Lead-free and ECOPACKTM compatible
Applications
Mobile terminals Gaming and virtual reality input devices Free-fall detection for data protection Antitheft systems and inertial navigation Appliance and robotics
STEVAL-MKI001V1
Description
The STEVAL-MKI001V1 is an evaluation kit designed to provide the user with a platform for evaluating the LIS3L02AS4 MEMS accelerometer in the SO24 package with analog output. It implements a typical application composed of the LIS3L02AS4 accelerometer and the TS924 rail-torail precision buffer. The supply voltage is generated by an LE33 voltage regulator, which ensures the correct power required by the LIS3L02AS4 device. All parts on the STEVAL-MKI001V1 evaluation kit board are STMicroelectronics components.
October 2007
Rev 2
1/5
www.st.com 5
For further information contact your local STMicroelectronics sales office.
General circuit description
STEVAL-MKI001V1
1
General circuit description
The sensing element, capable of detecting the acceleration, is manufactured using a dedicated process developed by ST to produce inertial sensors and actuators in silicon. The IC interface is manufactured using a standard CMOS process that allows high level of integration to design a dedicated circuit which is trimmed to better match the sensing element characteristics. The LIS3L02AS4 has a user selectable full scale of 2g, 6g and it is capable of measuring accelerations over a bandwidth of 1.5 KHz for all axes. The device bandwidth may be reduced by using external capacitances. A self-test capability allows to check the mechanical and electrical signal path of the sensor. The LIS3L02AS4 is available in plastic SMD package and it is specified over an extended temperature range of -40C to +85C.
2/5
Board schematic
J3 LE 33 linear voltage regulator case: SO8 or TO92 TS9 24 rail to rail Low noise Qu ad operational amplifier
VX VY VZ
1 2 3
Buffered Output
U1 LE 33 1 2 3
J4
Vo ut X Vo ut Y Vo ut Z U3
1 2 3
Sens or Output
VD D J2 1 2 ps r Pow er_ Supp ly LE 33 C1 2. 2uF C2 10 0n F 1 2 3 4 1 2 3 4 8 7 6 5 1 2 8 7 6 5 U2 J1 Vo ut X Vo ut Y VD D
VX
VY
1 2 3 4 5 6 7
VO UT1 VO UT4 V-1 V-4 V+1 V+4 VCC GN D V+2 V+3 V-2 V-3 VO UT2 VO UT3 TS9 24
14 13 12 11 10 9 8 VZ
Vo ut Z
VD D C3 10 uF + C4 10 0n F U4 1 2 3 4 5 6 7 8 9 10 11 12 VD D Self Test J7 Cy 1n 5F Cx 1n 5F 1 2 3 Vo ut Y Vo ut X Vo ut Z Cz 1n 5F NC NC NC NC NC GN D VD D Vy ST Vx PD Vz LIS3L 02 AS4 NC NC NC NC NC NC Rsv d Rsv d Rsv d Rsv d Rsv d FS 24 23 22 21 20 19 18 17 16 15 14 13
VD D
Board schematic
VD D Pow er Down 1 2 J5 R1 10 K
Scheme
VD D
Figure 1.
Ful l Scale
STEVAL-MKI001V1
1 2 3 J6
2
3/5
Revision history
STEVAL-MKI001V1
3
Revision history
Table 1.
Date 21-Aug-2007 16-Oct-2007
Document revision history
Revision 1 2 Initial release Content reworked to improve readability, no technical changes Changes
4/5
STEVAL-MKI001V1
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