ST LIS344ALH User Manual

April 2008 Rev 3 1/19

19

LIS344ALH

MEMS inertial sensor

high performance 3-axis ±2/±6g ultracompact linear accelerometer

Features

■ 2.4 V to 3.6 V single supply operation

■ ±2 g / ±6 g user selectable full-scale

■ Low power consumption

■ Output voltage, offset and sensitivity are

ratiometric to the supply voltage

■ Factory trimmed device sensitivity and offset

■ Embedded self test

■ RoHS/ECOPACK

®

compliant

■ High shock survivability ( 10000 g )

Description

The LIS344ALH is an ultra compact consumer

low-power three-axis 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 an ST

proprietary CMOS process with high level of

integration. The dedicated circuit is trimmed to

better match the sensing element characteristics.

The LIS344ALH has a dynamically user

selectable full-scale of ±2 g / ±6 g and it is

capable of measuring accelerations over a

maximum bandwidth of 1.8 kHz for all axes. The

device bandwidth may be reduced by using

external capacitances. The self-test capability

allows the user to check the functioning of the

system.

The LIS344ALH is available in Land Grid Array

package (LGA) manufactured by ST.

It is guaranteed to operate over an extended

temperature range of -40 °C to +85 °C.

The LIS344ALH belongs to a family of products

suitable for a variety of applications:

– Mobile terminals

– Gaming and virtual reality input devices

– Antitheft systems and inertial navigation

– Appliance and robotics.

LGA 16L

(4x4x1.5 mm)

Table 1. Device summary

Order codes Temp range [°C] Package Packaging

LIS344ALH -40 to +85 LGA-16L Tray

LIS344ALHTR -40 to +85 LGA-16L Tape and reel

www.st.com

Content LIS344ALH

2/19

Content

1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Mechanical and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.4 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2 IC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 Output response vs orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.1 Mechanical characteristics at 25 °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2 Mechanical characteristics derived from measurement in the -40 °C to +85

°C temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.3 Electrical characteristics at 25 °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

LIS344ALH List of figures

3/19

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. LIS344ALH electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 4. Output response vs orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 5. X axis Zero-g level at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 6. X axis Sensitivity at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 7. Y axis Zero-g level at 3.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 8. Y axis Sensitivity at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 9. Z axis Zero-g level at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 10. Z axis Sensitivity at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 11. X axis Zero-g level change vs. temperature at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 12. X axis Sensitivity change vs. temperature at 3.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 13. Y axis Zero-g level change vs. temperature at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 14. Y axis Sensitivity change vs. temperature at 3.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 15. Z axis Zero-g level change vs. temperature at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 16. Z axis Sensitivity change vs. temperature at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 17. Current consumption in normal mode at 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 18. Current consumption in power-down at 3.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 19. Noise density at 3.3 V (X, Y axis) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 20. Noise density at 3.3 V (Z axis) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 21. LGA 16: mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

List of tables LIS344ALH

4/19

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3. Mechanical characteristics @ Vdd =3.3 V, T = 25 °C unless otherwise noted. . . . . . . . . . . 7

Table 4. Electrical characteristics @ Vdd =3.3 V, T = 25 °C unless otherwise noted. . . . . . . . . . . . . 8

Table 5. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table 6. Filter capacitor selection, C

load

(x, y, z), . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 7. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

LIS344ALH Block diagram and pin description

5/19

1 Block diagram and pin description

1.1 Block diagram

Figure 1. Block diagram

1.2 Pin description

Figure 2. Pin connection

S/H

S/H

Routx

Routz

REFERENCE

TRIMMING CIRCUIT

CLOCK

S/H

Routy

CHARGE

AMPLIFIER

DEMUX

VoutX

VoutZ

Vou tY

Y+

Z+

Y-

Z-

X+

X-

a

SELF TEST

MUX

(TOP VIEW)

DIRECTIONS OF THE

DETECTABLE

ACCELERATIONS

(BOTTOM VIEW)

Y

1

X

Z

FS

ST

NC

Res

VoutX

NC

VoutY

NC

GND

NC

PD

VoutZ

Vdd

Res

NC

NC

1

8

12

5

49

13 16

Block diagram and pin description LIS344ALH

6/19

Table 2. Pin description

Pin # Pin name Function

1 FS Full scale selection (logic 0: ±2g full-scale; logic 1: ±6g full-scale)

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

3 NC Internally not connected

4 Res Leave unconnected or connect to Vdd

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

6 NC Internally not connected

7 GND 0 V supply

8 VoutZ Output voltage Z channel

9 NC Internally not connected

10 VoutY Output voltage Y channel

11 NC Internally not connected

12 VoutX Output voltage X channel

13 NC Internally not connected

14 Vdd Power supply

15 Res Connect to Vdd

16 NC Internally not connected