EK3L02AL

UM0249 User guide EK3L02AL Evaluation Kit Introduction The EK3L02AL is an Evaluation Kit designed to provide the user with a complete, ready-touse platform for the evaluation of the LIS3L02AL, a low-power 3-Axis linear capacitive accelerometer that includes a sensing element and an IC interface able to take information from the sensing element and to provide an analog signal to the external world. Besides the MEMS sensor, the system mounts a linear voltage regulator and a rail to rail Low noise Quad amplifier configured as non-inverting buffer thus making both direct sensor outputs and buffered sensor outputs available to the user. The kit provides also an easy way to control its Self-Test (ST) pin. c u d e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O June 2006 Rev 1 1/9 www.st.com Contents EK3L02AL user guide Contents 1 Evaluation Kit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Operating the Evaluation Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Driving ST signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2.1 Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Bill Of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 c u d e t le ) s ( ct u d o r P e t e l o s b O 2/9 o s b O - o r P ) s t( EK3L02AL user guide 1 Evaluation Kit Description Evaluation Kit Description The EK3L02AL is an Evaluation Kit designed to provide the user with a complete, ready-touse platform for the evaluation of the LIS3L02AL 3-axis analog output linear accelerometer. The block diagram of the evaluation kit and the top silk-screen of the board are shown respectively in Figure 1 and Figure 2 while the photo of the full board is given in Figure 3. Figure 1. Evaluation Board Block Diagram Voltage Regulator PS 3.3V MEMS Sensor PSR Self Test Output Buffer VXYZ Voutxyz Buffered Output Figure 2. c u d ) s t( o r P Sensor e t le Output o s b O - Top silk-screen for EK3L02AL board layout ) s ( ct u d o r P e t e l o s b O 3/9 Evaluation Kit Description Figure 3. EK3L02AL user guide Board photograph c u d 1.1 Operating the Evaluation Kit e t le ) s t( o r P o s b O - To operate the evaluation kit it is necessary to supply it through the connector marked as J1 (PS) with a dc voltage comprised between 3.7V and 18V. The suggested supply voltage is 5V. The typical current consumption of the LIS3L02AL MEMS sensor is 0.85 mA while the typical current consumption of the whole board is in the range of 6 mA. ) s ( ct The voltage applied to the board is then regulated through a linear voltage regulator which supplies the MEMS sensor at 3.3V. u d o The outputs (Voutx, Vouty and Voutz) of the LIS3L02AL linear accelerometer are band limited through the usage of three capacitors Cx, Cy and Cz of 1.5nF which, together with the output resistance Rout=110KΩ of the sensor, create a single-pole low-pass filter having a cut-off frequency of about 1KHz. r P e t e l o In case a different cut-off frequency ft is required, the above capacitances must be replaced by the users with other components having the value given by the following formula: bs O 1 C ( x, y, x ) = ----------------------------------2 ⋅ π ⋅ R out ⋅ f t As anticipated above, the EK3L02AL makes both the direct sensor outputs and the buffered signals available to the outside through two different connectors which are named respectively J4 (Sensor output) and J3 (Buffered output). In particular the three channels are made available going from the left to right of the board in the order Voutx, Vouty and Voutz. The buffering of the sensor outputs is obtained though the usage of a rail-to-rail low-noise quad-amplifier configured as non-inverting buffer. 4/9 EK3L02AL user guide 1.2 Evaluation Kit Description Driving ST signal The board allows to control ST (Self Test) signal through the usage of a test point (marked J7) and a jumper. 1.2.1 Self-Test When the jumper related to J7 (ST) is either inserted as marked highlighted by the red box in Figure 2 or completely removed from the board the self-test feature is disabled. In order to activate the self-test feature the afore said jumper must be into J7 so to shortcircuit its central and upper pins. 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 LIS3L02AL sensor. c u d e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O 5/9 1 2 VDD C1 2.2uF LE33 1 1 2 2 3 3 4 4 U2 8 8 7 7 6 6 5 5 1 2 3 6/9 psr J2 s b O t e l o U1 LE33 Self Test J7 1 2 3 C2 100nF VDD Cz 1n5F Power_Supply 1 2 J1 u d o 3 VoutZ 2 1 U4 LIS3L02AL GND VoutZ ST 8 r P e LE33 linear voltage regulator case: SO8 or TO92 ) s ( ct o s b O VDD TP2 Rsvd VoutY VoutX C3 1uF 5 VDD Cx 1n5F C4 100nF VoutY VoutX Cy 1n5F TP1 VY VX TS924 VOUT1 V-1 V+1 VCC V+2 V-2 VOUT2 U3 VOUT4 V-4 V+4 GND V+3 V-3 VOUT3 14 13 12 11 10 9 8 TS924 rail to rail Low noise Quad operational amplifier 1 2 3 4 5 6 7 c u d o r P 6 VoutY 7 VoutX + e t le Vdd VZ VoutX VoutY VoutZ VX VY VZ VoutZ 1 2 3 J4 1 2 3 J3 Sensor Output Buffered Output Figure 4. Rsvd 2 4 Schematic Diagram EK3L02AL user guide Schematic Diagram The schematic diagram of the EK3L02AL evaluation kit is shown in Figure 4. Schematic diagram for EK3L02AL board ) s t( EK3L02AL user guide 3 Bill Of Material Bill Of Material The Bill of Material for EK3L02AL evaluation kit is given in Table 1 Table 1. Bill Of Material Item Quantity Reference Value 1 2 C2,C4 100nF 2 1 C1 2.2uF 3 3 Cx,Cy,Cz 1.5nF 4 1 C3 1uF 5 2 J1,J2 CON2 6 3 J3,J4,J7 CON3 7 1 U2 LE33 8 1 U3 TS924 9 1 U4 e t le ) s ( ct c u d ) s t( LIS3L02AL o r P o s b O - u d o r P e t e l o s b O 7/9 Revision History 4 EK3L02AL user guide Revision History Table 2. Document revision history Date Revision 07-Jun-2006 1 Changes Initial release. c u d e t le ) s ( ct u d o r P e t e l o s b O 8/9 o s b O - o r P ) s t( EK3L02AL user guide Please Read Carefully: Information in this document is provided solely in connection with ST products. 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