STMicroelectronics LIS 2 L 02 AL Service Manual

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2-axis - +/-2g ULTRACOMPACT LINEAR ACCELEROMETER
2.4V TO 5.25V SINGLE SUPPLY
OPERATION
LOW POWER CONSUMPTION
±2g FULL-SCALE
0.3mg RESOLUTION OVER 100Hz
BANDWIDTH
EMBEDDED SELF TEST
OUTPUT VOLTAGE, OFFSET AND
SENSITIVITY RATIOMETRIC TO THE SUPPLY VOLTAGE
HIGH SHOCK SURVIVABILITY
ECO-PACK COMPLIANT
Description
The LIS2L02AL is a low-power 2-axis linear capacitive 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
LIS2L02AL
MEMS INERTIAL SENSOR:
LGA-8
to design a dedicated circuit which is trimmed to better match the sensing element characteristics.
The LIS2L02AL has a full scale of capable of measuring accelerations over a bandwidth of 2.0 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 LIS2L02AL is available in plastic SMD package and it is guaranteed to operate over an extended temperature range of -40°C to +85°C.
The LIS2L02AL 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.
±2g and it is
Order codes
Part number Temp range, °C Package Packing
LIS2L02AL -40°C to +85°C LGA-8 Tray
LIS2L02ALTR -40°C to +85°C LGA-8 Tape & Reel
Rev 1
September 2005 CD00068420 1/17
www.st.com
17
LIS2L02AL
Contents
1 Block Diagram & Pins Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Mechanical and Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 IC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Output Response vs Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Mechanical Characteristics at 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 Mechanical Characteristics derived from measurement in the
-40°C to +85°C temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3 Electrical characteristics at 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17 CD00068420

LIS2L02AL 1 Block Diagram & Pins Description

1 Block Diagram & Pins Description

1.1 Block diagram

Figure 1. Block Diagram

X+
Y+
a
Y-
X-
SELF TEST

1.2 Pin Description

Figure 2. Pin Connection

MUX
REFERENCE
CHARGE
AMPLIFIER
TRIMMING CIRCUIT
DEMUX
S/H
S/H
CLOCK
Routx
Routy
Voutx
Vouty
X
1
Y
DIRECTION OF THE DETECTABLE ACCELERATIONS
LIS2L02AL
Vdd
Voutx
Vouty
Reserved
Reserved
BOTTOM VIEW
CD00068420 3/17
ST
NC
GND
1 Block Diagram & Pins Description LIS2L02AL
Table 1. Pin description
Pin # Pin Name Function
1 ST Self Test (Logic 0: normal mode; Logic 1: Self-test)
2 NC Not connected
3 GND 0V supply
4 Reserved Leave unconnected
5 Reserved Leave unconnected
6 Vouty Output Voltage Y channel
7 Voutx Output Voltage X channel
8 Vdd Power supply
4/17 CD00068420

LIS2L02AL 2 Mechanical and Electrical Specifications

2 Mechanical and Electrical Specifications

2.1 Mechanical Characteristics

Table 2. Mechanical Characteristics1
(Temperature range -40°C to +85°C) All the parameters are specified @ Vdd =3.3V, T = 25°C unless otherwise noted.
Symbol Parameter Test Condition Min.
Typ.
2
Max. Unit
Ar
So
SoDr
Voff
OffDr
NL
CrossAx
An
Vt
Acceleration Range
Sensitivity
Sensitivity Change Vs Temperature
Zero-g Level
Zero-g level Change Vs Temperature
Non Linearity
Cross-Axis
Acceleration Noise Density
Self test Output Voltage
Change
4
6
7,8
3
4
5
±1.8 ±2.0 g
Full-scale = 2g Vdd/5–10% Vdd/5 Vdd/5+10% V/g
Delta from +25°C ±0.01 %/°C
T = 25°C Vdd/2-6% Vdd/2 Vdd/2+6% V
Delta from +25°C ±0.2 mg/°C
Best fit straight line Full-scale = 2g X, Y axis
Vdd=3.3V; Full-scale = 2g
T = 25°C Vdd=3.3V Full-scale = 2g X axis
T = 25°C Vdd=3.3V Full-scale = 2g Y axis
-20 -50 -100 mV
20 50 100 mV
±0.3 ±1.5 %
±2 ±4%
30
µg/
Hz
Fres
To p
Wh Product Weight 0.08 gram
Sensing Element
Resonance Frequency
Operating Temperature Range
all axes 2.0 kHz
9
-40 +85 °C
Note: 1 The product is factory calibrated at 3.3V. The device can be powered from 2.4V to 5.25V. Voff,
So and Vt parameters will vary with supply voltage.
2 Typical specifications are not guaranteed
3 Guaranteed 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
CD00068420 5/17
2 Mechanical and Electrical Specifications LIS2L02AL
6 Contribution to the measuring output of the 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
π
9 Minimum resonance frequency Fres=2.0KHz. Sensor bandwidth=1/(2*
*110kΩ*Cload) with
Cload>723pF.

2.2 Electrical Characteristics

Table 3. Electrical Characteristics
1
(Temperature range -40°C to +85°C) All the parameters are specified @ Vdd =3.3V, T=25°C unless otherwise noted
Symbol Parameter Test Condition Min.
Vdd Supply Voltage 2.4 3.3 5.25 V
Idd Supply Current mean value 0.85 1.5 mA
Vst Self Test Input
Rout Output Impedance 80 110 140 k
Cload
To p
Capacitive Load Drive
Operating Temperature Range
Logic 0 level 0 0.3*Vdd V
Logic 1 level 0.7*Vdd Vdd V
3
723 pF
-40 +85 °C
Typ.
2
Max. Unit
Note: 1 The product is factory calibrated at 3.3V
2 Typical specifications are not guaranteed
3 Minimum resonance frequency Fres=2.0kHz. Sensor bandwidth=1/(2*
π
*110kΩ*Cload) with
Cload>723pF
6/17 CD00068420
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