PDF LIS3L02DQ Data sheet ( Hoja de datos )

Número de pieza	LIS3L02DQ
Descripción	INERTIAL SENSOR
Fabricantes	STMicroelectronics
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No Preview Available ! LIS3L02DQ INERTIAL SENSOR: 3Axis - 2g DIGITAL OUTPUT LINEAR ACCELEROMETER w1ww.daFtaEshAeeTt4Uu.cRomES ■ 2.7V TO 3.6V SINGLE SUPPLY OPERATION ■ 1.8V COMPATIBLE IOs ■ I2C/SPI DIGITAL OUTPUT INTERFACES ■ MOTION ACTIVATED INTERRUPT SOURCE ■ FACTORY TRIMMED DEVICE SENSITIVITY AND OFFSET ■ EMBEDDED SELF TEST ■ HIGH SHOCK SURVIVABILITY Figure 1. Package PRELIMINARY DATA QFN-44 Table 1. Order Codes Part Number LIS3L02DQ Package QFN-44 2 DESCRIPTION The LIS3L02DQ is a tri-axis digital output linear accelerometer that includes a sensing element and an IC interface able to take the information from the sensing element and to provide the mea- sured acceleration signals to the external world through an I2C/SPI serial interface. The sensing element, capable to detect the accel- eration, is manufactured using a dedicated pro- cess called THELMA (Thick Epi-Poly Layer for Microactuators and Accelerometers) developed by ST to produce inertial sensors and actuators in silicon. The IC interface instead is manufactured using a CMOS process that allows high level of integration to design a dedicated circuit which is factory trimmed to better match the sensing element char- acteristics. The LIS3L02DQ is capable of measuring acceler- ations over a maximum bandwidth of 2.0 KHz for the X, Y axis and Z axis. The device bandwidth may be selected accordingly to the application re- quirements. A self-test capability allows the user to check the functioning of the system. The device may be configured to generate an iner- tial wake-up/interrupt signal when a programma- ble acceleration threshold is exceeded along one of the three axis. The LIS3L02DQ is available in plastic SMD pack- age and it is specified over a temperature range extending from -20°C to +70°C. The LIS3L02DQ belongs to a family of products suitable for a variety of applications: – Motion activated functions in mobile terminals – Antitheft systems and Inertial navigation – Gaming and Virtual Reality input devices – Vibration Monitoring and Compensation Figure 2. Block Diagram S1X S1Y CHARGE Σ∆ Reconstruction Filter CS S1Z AMPLIFIER SCL/SPC rot MUX S2Z DE MUX Σ∆ Reconstruction Filter Regs Array I2C SPI SDA/SDIO SDO S2Y S2X Σ∆ Reconstruction Filter VOLTAGE & CURRENT REFERENCE TRIMMING CIRCUIT & TEST INTERFACE CLOCK & PHASE GENERATOR CONTROL LOGIC & INTERRUPT GEN. RDY/INT January 2005 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. Rev. 3 1/19 1 page LIS3L02DQ 3 FUNCTIONALITY 3.1 Sensing element The THELMA process is utilized to create a surface micro-machined accelerometer. The technology al- lows to carry out suspended silicon structures which are attached to the substrate in a few points called anchors and free to move on a plane parallel to the substrate itself. To be compatible with the traditional packaging techniques a cap is placed on top of the sensing element to avoid blocking the moving parts wdwuwr.idnagtatshheeemt4ou.lcdoinmg phase. The equivalent circuit for the sensing element is shown in the below figure; when a linear acceleration is applied, the proof mass displaces from its nominal position, causing an imbalance in the capacitive half- bridge. This imbalance is measured using charge integration in response to a voltage pulse applied to the sense capacitor. The nominal value of the capacitors, at steady state, is few pF and when an acceleration is applied the maximum variation of the capacitive load is few tenth of pF. Figure 4. Equivalent electrical circuit Cps1 Rs1 S1x Cs1x Cpr Rr Cps2 Cps1 Cpr Cps2 Cps1 Cpr Cs2x Rs2 Rs1 Cs1y Rr Cs2y Rs2 Rs1 Cs1z Rr S2x S1y S2y S1z rot Cps2 Cs2z Rs2 S2z 5/19 5 Page LIS3L02DQ 5 REGISTERS MAPPING The table given below provides a listing of the registers embedded in the device and the related address. All the “application related” registers (i.e. control, status, data) are mapped into Bank2 so to simplify their access when running through the SPI interface. Reg. Name www.datasheet4u.com OFFSET_X OFFSET_Y OFFSET_Z GAIN_X GAIN_Y GAIN_Z CTRL_REG1 CTRL_REG2 WAKE_UP_CFG WAKE_UP_SRC WAKE_UP_ACK STATUS_REG OUTX_L OUTX_H OUTY_L OUTY_H OUTZ_L OUTZ_H THS_L THS_H Type rw rw rw rw rw rw rw rw rw r r rw r r r r r r rw rw Register Address Binary Hex 0000000 - 0010101 00 - 15 0010110 16 0010111 17 0011000 18 0011001 19 0011010 1A 0011011 1B 0011100 - 0011111 1C - 1F 0100000 20 0100001 21 0100010 22 0100011 23 0100100 24 0100101 25 0100110 26 0100111 27 0101000 28 0101001 29 0101010 2A 0101011 2B 0101100 2C 0101101 2D 0101110 2E 0101111 2F 0110000 - 1111111 30 - 3F Size (Bit) 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 Comment Reserved Loaded at boot Loaded at boot Loaded at boot Loaded at boot Loaded at boot Loaded at boot Reserved Reserved Reserved Reserved 11/19 11 Page

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