ST LIS332AR User Manual

3-axis ±2 g analog-output ultracompact accelerometer

Features

■ Single voltage supply operation

■ ±2 g full-scale

■ High stability over temperature

■ Ratiometric output voltage

■ Power-down mode

■ Embedded self-test

■ 10000 g high shock survivability

■ ECOPACK

(see Section 7)

RoHS and “Green” compliant

LIS332AR

MEMS motion sensor:

LGA-16

circuit which is trimmed to better match the sensing element characteristics.

(3x3x1.0mm)

Applications

■ Tilting applications

■ Free-fall detection

■ Gaming

■ Anti-theft systems

■ Inertial navigation and motion tracking

Description

The LIS332AR is a miniaturized low-power 3-axis linear accelerometer belonging to the “nano” family of ST motion sensors. It includes a sensing element and an IC interface 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 motion sensors and actuators in silicon.

The IC interface is manufactured using a CMOS process that allows the design of a dedicated

Table 1. Device summary

Order code Temperature range [°C] Package Packing

The LIS332AR has a full-scale of ±2 g, and is capable of measuring accelerations over a maximum bandwidth of 2.0 kHz. The device bandwidth may be reduced by using external capacitors. The self-test capability allows the user to check the functioning of the sensor in the final application.

ST is already in the field with several hundred million sensors which have received excellent acceptance from the market in terms of quality, reliability and performance.

The LIS332AR is provided in a plastic land grid array (LGA) package.

Several years ago ST successfully pioneered the use of this package for accelerometers. Today, ST has the widest manufacturing capability and strongest expertise in the world for production of sensors in plastic LGA packages.

LIS332AR -40 to +85 LGA-16 Tray

LIS332ARTR -40 to +85 LGA-16 Tape and reel

February 2010 Doc ID 16931 Rev 1 1/14

www.st.com

Contents LIS332AR

Contents

1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Pin connections and description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Mechanical and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1 Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.2 Zero-g level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.3 Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.4 Output impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.1 Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2 IC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.3 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.1 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.2 Output response vs. orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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LIS332AR Block diagram and pin description

1 Block diagram and pin description

Figure 1. Block diagram

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1.1 Pin connections and description

Figure 2. Pin connection

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Doc ID 16931 Rev 1 3/14

Block diagram and pin description LIS332AR

Table 2. Pin description

Pin # Pin name Function

1 NC Internally not connected

2 res Connect to Vdd

3 NC Internally not connected

4 ST Self-test (logic 0: normal mode; logic 1: self-test mode)

5 PD Power-down (logic 0: normal mode; logic 1: power-down mode)

6 GND 0 V supply

7 NC Internally not connected

8 NC Internally not connected

9 Voutz Output voltage Z channel

10 NC Internally not connected

11 Vouty Output voltage Y channel

12 NC Internally not connected

13 Voutx Output voltage X channel

14 NC Internally not connected

15 res Connect to Vdd

16 Vdd Power supply

4/14 Doc ID 16931 Rev 1

LIS332AR Mechanical and electrical specifications

2 Mechanical and electrical specifications

2.1 Mechanical characteristics

-Vout

(a)

(1)

Max. Unit

±2 g

0.2*Vdd –5%

0.2*Vdd

0.2*Vdd + 5%

±2 %

60 700 mV

-40 +85 °C

(Vst=logic 0)

LOAD

), with C

LOAD

>2.5 nF

@ Vdd=3 V, T=25 °C unless otherwise noted

Table 3. Mechanical characteristics

Symbol Parameter Test condition Min. Typ.

(4)

(6),(7)

(2)

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 ±0.5 % FS

Vdd=3 V 100 µg/

T=25 °C Vdd=3 V X axis

T=25 °C Vdd=3 V Y axis

T=25 °C Vdd=3 V Z axis

All axes 2.0 kHz

(8)

(Vst=logic 1)

=2.0 kHz. Sensor bandwidth=1/(2*π*32kΩ*C

RES

Ar Acceleration range

So Sensitivity

SoDr

Sensitivity change vs. temperature

(3)

Voff Zero-g level

OffDr

Zero-g level change vs. temperature

NL Non linearity

CrossAx Cross-axis

Acceleration noise

density

Self-test output

voltage change

Fres

Top

Sensing element resonant frequency

Operating temperature range

(5)

Wh Product weight 30 mgram

1. Typical specifications are not guaranteed

2. Guaranteed by wafer level test and measurement of initial offset and sensitivity

3. Zero-g level and sensitivity are ratiometric to supply voltage

4. Guaranteed by design

5. Contribution to the measured output of an inclination/acceleration along any perpendicular axis

6. “Self-test output voltage change” is defined as Vout

7. “Self-test output voltage change” varies cubically with supply voltage

8. Minimum resonance frequency F

V/g

a. The product is factory calibrated at 3 V. The operational power supply range is specified in Table 4. Since the

device is ratiometric, Voff, So and Vt parameters vary with supply voltage.

Doc ID 16931 Rev 1 5/14

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