ST LIS332AX User Manual

LIS332AX

MEMS inertial sensor: 3-axis ±2 g absolute analog-output ultracompact accelerometer

Features

■Single voltage supply operation

■±2 g full-scale

■Excellent stability over temperature

■Absolute 0-g level and sensitivity

■Factory-trimmed device sensitivity and 0-g level

■Power-down mode

■Embedded self-test

■10000 g high shock survivability

■ECOPACK® RoHS and “Green” compliant (see Section 7)

Applications

■Tilting applications

■Free-fall detection

■Gaming

■Anti-theft systems

■Inertial navigation and motion tracking

Description

The LIS332AX is an ultracompact low-power 3- axis linear accelerometer that 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 inertial sensors and actuators in silicon.

LGA-16 (3x3x1.0mm)

The IC interface is manufactured using a CMOS process that allows a high level of integration to design a dedicated circuit trimmed to better match the sensing element characteristics.

The LIS332AX 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 system.

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 LIS332AX 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.

Table 1.	Device summary
Part number		Temperature range, ° C	Package	Packing
	LIS332AX	-40°C to +85°C	LGA-16	Tray
LIS332AXTR		-40°C to +85°C	LGA-16	Tape and reel
February 2010		Doc ID 16932 Rev 1		1/14
				www.st.com

Contents	LIS332AX

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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LIS332AX	Block diagram and pin description

1 Block diagram and pin description

Figure 1. Block diagram

	8			2OUTX	6OUTX
		#(!2'%	3 (
	9
		!-0,)&)%2
	:
A	-58	$%-58		2OUTY	6OUTY
			3 (
	:
	9
	8			2OUTZ	6OUTZ
			3 (
					0$
3%,& 4%34	2%&%2%.#% 42)--).' #)2#5)4		#,/#+		0/7%2 $/7.
					!-V

1.1Pin connections and description

Figure 2. Pin connection

8	9	6OUTX
		.#
		6OUTY
	:	.#
		6OUTZ
	4OP VIEW
	$IRECTION OF THE DETECTABLE
	ACCELERATIONS

D6D RES #.

$.' #. #.

"OTTOMTVIEW

.# RES

.#

34

0$

!-V

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Block diagram and pin description				LIS332AX
	Table 2.	Pin description
	Pin #		Pin name	Function
	1		NC	Internally not connected
	2		res	Connect to Vdd
	3		NC	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	Not connected
	8		NC	Not connected
	9		Voutz	Output voltage Z channel
	10		NC	Not connected
	11		Vouty	Output voltage Y channel
	12		NC	Not connected
	13		Voutx	Output voltage X channel
	14		NC	Not connected
	15		res	Connect to Vdd
	16		Vdd	Power supply

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LIS332AX	Mechanical and electrical specifications

2 Mechanical and electrical specifications

2.1Mechanical characteristics

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

Table 3.	Mechanical characteristics
Symbol	Parameter	Test condition	Min.	Typ.(1)	Max.	Unit
Ar	Acceleration range(2)			±2.0		g
So	Sensitivity(3)		0.363 - 5%	0.363	0.363 + 5%	V/g
SoDr	Sensitivity change vs.	Delta from +25 °C		±0.01		%/°C
	temperature
Voff	Zero-g level(4)	T = 25°C	1.25-3.5%	1.25	1.25+3.5%	V
OffDr	Zero-g level change	Delta from +25 °C		±0.2		mg/°C
	vs. temperature
NL	Non linearity(4)	Best fit straight line		±0.5		% FS
CrossAx	Cross-axis(5)			±2		%
An	Acceleration noise	Vdd=3 V		100		g/ Hz
	density
		T = 25 °C	40		550	mV
		X axis
Vt	Self-test output	T = 25 °C	40		550	mV
	voltage change(6)	Y axis
		T = 25 °C	40		550	mV
		Z axis
Fres	Sensing element	X, Y, Z axis	2.0			kHz
	resonant frequency(7)
Top	Operating		-40		+85	°C
	temperature range
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 absolute to supply voltage

4.Guaranteed by design

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

6.“Self-test output voltage change” is defined as Vout(Vst=Logic1)-Vout(Vst=Logic0)

7.Minimum resonance frequency FRES=2.0 kHz. Sensor bandwidth=1/(2*π*32kΩ*CLOAD), with CLOAD>2.5 nF

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

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