MEMS INERTIAL SENSOR

LIS3L02AS5 MEMS INERTIAL SENSOR: 3-axis - ±2g/6g LINEAR ACCELEROMETER Features ■ ■ ■ ■ ■ ■ 4.5 TO 5.5V SINGLE SUPPLY OPERATION LOW POWER CONSUMPTION ±2g/±6g USER SELECTABLE FULL-SCALE 0.5mg RESOLUTION OVER 100Hz BANDWIDTH EMBEDDED SELF TEST AND POWER DOWN OUTPUT VOLTAGE, OFFSET AND SENSITIVITY RATIOMETRIC TO THE SUPPLY VOLTAGE HIGH SHOCK SURVIVABILITY LEAD FREE AND ECOPACK COMPATIBLE SO24 to design a dedicated circuit which is trimmed to better match the sensing element characteristics. The LIS3L02AS5 has a user selectable full scale of ±2g, ±6g and it is capable of measuring accelerations over a bandwidth of 1.5kHz 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 LIS3L02AS5 is available in plastic SMD package and it is specified over an extended temperature range of -40°C to +85°C. The LIS3L02AS5 belongs to a family of products suitable for a variety of applications: – Mobile terminals – Gaming and Virtual Reality input devices – Free-fall detection for data protection – Antitheft systems and Inertial Navigation – Appliance and Robotics. ■ ■ Description www.DataSheet4U.com The LIS3L02AS5 is a low-power three axes linear accelerometer that includes a sensing element and an IC interface able to take the information from the sensing element and to provide an analog signal to the external world. 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 Order codes Part number LIS3L02AS5 LIS3L02AS5TR Temp range, ° C -40°C to +85°C -40°C to +85°C Package SO24 SO24 Packing Tray Tape & Reel December 2005 Rev 1 1/14 www.st.com 14 LIS3L02AS5 Contents 1 Block Diagram & Pins Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Mechanical and Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 2.2 2.3 2.4 Mechanical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 3.2 3.3 Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 IC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.1 4.2 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Output response vs orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5 6 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2/14 LIS3L02AS5 1 Block Diagram & Pins Description 1 1.1 Block Diagram & Pins Description Block diagram Figure 1. Block Diagram X+ Y+ Z+ Routx CHARGE AMPLIFIER S/H Voutx a ZYX- MUX DEMUX Routy S/H Vouty Routz S/H Voutz SELF TEST REFERENCE TRIMMING CIRCUIT CLOCK 1.2 Pin Description Figure 2. Pin Connection (top view) NC DIRECTION OF THE DETECTABLE ACCELERATIONS X 13 NC NC NC NC NC NC Reserved Reserved Reserved Reserved Reserved FS NC NC NC NC GND Y 1 Vdd Vouty ST Z Voutx PD Voutz 3/14 1 Block Diagram & Pins Description LIS3L02AS5 Table 1. Pin # 1 to 5 6 7 8 9 10 11 12 13 14-15 16 17 18 19 to 24 Pin description Pin Name NC GND Vdd Vouty ST Voutx PD Voutz FS Reserved Reserved Reserved Reserved NC Internally not connected 0V supply Power supply Output Voltage Self Test (Logic 0: normal mode; Logic 1: Self-test) Output Voltage Power Down (Logic 0: normal mode; Logic 1: Power-Down mode) Output Voltage Full Scale selection (Logic 0: 2g Full-scale; Logic 1: 6g Full-scale) Leave unconnected or connect to Vdd Connect to Vdd or ground Leave unconnected or connect to Vdd Leave unconnected or connect to ground Internally not connected Function 4/14 LIS3L02AS5 2 Mechanical and Electrical Specifications 2 2.1 Table 2. Mechanical and Electrical Specifications Mechanical Characteristics. Mechanical Characteristics1 (Temperature range -40°C to +85°C) All the parameters specified @ Vdd = 5.0V, T = 25°C unless otherwise noted Parameter Test Condition FS pin connected to GND FS pin connected to Vdd Full-scale = 2g Full-scale = 6g Delta from +25°C T = 25°C Delta from +25°C Best fit straight line Full-scale = 2g X, Y axis Best fit straight line; Full-scale = 2g Z axis Vdd/2-10% Min. ±1.8 ±5.4 Vdd/5–10% Vdd/15–10% Typ.2 ±2.0 ±6.0 Vdd/5 Vdd/15 ±0.01 Vdd/2 ±1.1 Vdd/2+10% Vdd/5+10% Vdd/15+10% Max. Unit g g V/g V/g %/°C V mg/°C Symbol Ar Acceleration Range3 So Sensitivity4 Sensitivity Change Vs Temperature Zero-g Level4 Zero-g level Change Vs Temperature SoDr Voff OffDr ±0.3 ±1.5 % FS NL Non Linearity5 ±0.6 ±2 ±2 ±4 % FS CrossAx Cross-Axis6 An Acceleration Noise Density Vdd=5.0V; Full-scale = 2g T = 25°C Vdd=5.0V Full-scale = 2g X axis Self test Output Voltage Change7,8,9 T = 25°C Vdd=5.0V Full-scale = 2g Y axis T = 25°C Vdd=5.0V Full-scale = 2g Z axis Fres Sensing Element all axes Resonance Frequency10 % µg/ Hz 50 -70 -160 -320 mV Vt 70 160 320 mV -70 -130 -320 mV 1.5 KHz 5/14 2 Mechanical and Electrical Specifications LIS3L02AS5 Table 2. Mechanical Characteristics1 (continued) (Temperature range -40°C to +85°C) All the parameters specified @ Vdd = 5.0V, T = 25°C unless otherwise noted Parameter Operating Temperature Range Product Weight Test Condition Min. -40 0.6 Typ.2 Max. +85 Unit °C gram Symbol Top Wh Note: 1 The product is factory calibrated at 5.0V. The device can be powered from 4.5V to 5.5V. Voff, So and Vt parameters will vary with supply voltage. 2 Typical specifications are not guaranteed 3 Verified by wafer level test and measurement of initial offset and sensitivity 4 Zero-g level and sensitivity are essentially ratiometric to supply voltage 5 Guaranteed by design 6 Contribution to the measuring output of an inclination/acceleration along any perpendicular axis 7 “Self test output voltage change” is defined as Vout(Vst=Logic1)-Vout(Vst=Logic0) 8 “Self test output voltage change” varies cubically with supply voltage 9 When full-scale is set to ±6g, “self-test output voltage change” is one third of the specified value. 10 Minimum resonance frequency Fres=1.5KHz. Sensor bandwidth=1/(2*π*110KΩ*Cload) with Cload>1nF. 2.2 Table 3. Electrical Characteristics Electrical Characteristics1 (Temperature range -40°C to +85°C) All the parameters are specified @ Vdd =5.0V, T=25°C unless otherwise noted Parameter Supply Voltage Supply Current Supply Current in Power Down Mode Self Test Input Logic 1 level Rout Output Impedance Capacitive Load Drive3 Turn-On Time at exit from Cload in µF Power Down mode 3.6 80 320 550*Cload+0.3 110 Vdd 140 V kΩ pF ms mean value PD pin connected to GND rms value PD pin connected to Vdd Logic 0 level Vst 0 Test Condition Min. 4.5 Typ.2 5 1.0 2.5 Max. 5.5 1.5 5 0.8 Unit V mA µA V Symbol Vdd Idd IddPdn Cload Ton Note: 1 The product is factory calibrated at 5.0V 2 Typical specifications are not guaranteed 3 Minimum resonance frequency Fres=1.5KHz. Sensor bandwidth=1/(2*π*110kΩ*Cload) with Cload>1nF 6/14 LIS3L02AS5 2 Mechanical and Electrical Specifications 2.3 Absolute maximum ratings Stresses above those listed as “absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device under these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Table 4. Symbol Vdd Vin APOW Supply voltage Input Voltage on Any Control pin (FS, PD, ST) Acceleration (Any axis, Powered, Vdd=5.0V) 10000g for 0.1 ms 3000g for 0.5 ms Acceleration (Any axis, Not powered) 10000g for 0.1 ms Storage Temperature Range -40 to +125 2 (HBM) ESD Electrostatic Discharge Protection 200 (MM) 1500 (CDM) °C kV V V Absolute maximum ratings Ratings Maximum Value -0.3 to 7 -0.3 to Vdd +0.3 3000g for 0.5 ms Unit V V AUNP TSTG This is a Mechanical Shock sensitive device, improper handling can cause permanent damages to the part This is an ESD sensitive device, improper handling can cause permanent damages to the part 2.4 Terminology Sensitivity describes the gain of the sensor and can be determined by applying 1g acceleration to it. As the sensor can measure DC accelerations this can be done easily by pointing the axis of interest towards the center of the earth, note the output value, rotate the sensor by 180 degrees (point to the sky) and note the output value again thus applying ±1g acceleration to the sensor. Subtracting the larger output value from the smaller one and dividing the result by 2 will give the actual sensitivity of the sensor. This value changes v