LIS331AL

Mechanical and electrical specifications

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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.

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 very

little over temperature (see sensitivity change vs. temperature) and also very little over time.

The Sensitivity Tolerance describes the range of Sensitivities of a large population of

sensors.

Zero-g level describes the actual output signal if there is no acceleration present. A sensor

in a steady state on a horizontal surface will measure 0g in X axis and 0g in Y axis whereas

the Z axis will measure +1g. The output is ideally for a 3.3V powered sensor Vdd/2 =

1650mV. A deviation from ideal 0-g level (1650mV in this case) is called Zero-g offset. Offset

of precise MEMS sensors is to some extend a result of stress to the sensor and therefore

the offset can slightly change after mounting the sensor onto a printed circuit board or

exposing it to extensive mechanical stress. Offset changes little over temperature - see

“Zero-g level change vs. temperature” - the Zero-g level of an individual sensor is very stable

Table 5.

Absolute maximum ratings

Symbol

Ratings

Maximum value

Unit

Vdd

Supply voltage

-0.3 to 6

V

Vin

Input voltage on any control pin (ST,PD)

-0.3 to Vdd +0.3

V

Acceleration (any axis, powered, Vdd=3.3V)

3000g for 0.5 ms

10000g for 0.1 ms

Acceleration (any axis, not powered)

3000g for 0.5 ms

10000g for 0.1 ms

ESD

Electrostatic discharge protection

4.0 (HBM)

kV

1.5 (CDM)

kV

400 (MM)

V

Storage temperature range

-40 to +125

°C

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