ST LIS352AX User Manual

LIS352AX

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

Features

■Absolute 0-g level and sensitivity

■Excellent stability over temperature

■3 acceleration channels plus multiplexed analog output

■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 6)

Applications

■Free-fall detection for data protection

■Tilting applications

■Mobile and battery-operated terminals

■Gaming and virtual reality input devices

■Anti-theft systems and Inertial navigation

LGA-14 (3x5x0.9mm)

The LIS352AX 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.

An embedded multiplexer allows the redirection of the analog outputs onto a single pin for operation with a single-channel A/D converter.

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.

Description

The LIS352AX is a new small size, low-power 3- axis linear accelerometer that includes a sensing element and an IC interface capable of providing an absolute analog signal to the external world.

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 LIS352AX 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
Order code		Temperature range, ° C	Package	Packing
	LIS352AX	-40°C to +85°C	LGA-14	Tray
LIS352AXTR		-40°C to +85°C	LGA-14	Tape and reel
February 2010		Doc ID 15530 Rev 2		1/15
				www.st.com

Contents	LIS352AX

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
	3.1	Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
	3.2	Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
	3.3	Zero-g level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
	3.4	Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
	3.5	Output impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8

4	Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		9
	4.1	Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	4.2	IC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
	4.3	Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9

5	Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10
	5.1	Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	5.2	Output response vs. orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
6	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		13
7	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		14

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LIS352AX	Block diagram and pin description

1 Block diagram and pin description

Figure 1. Block diagram

	X+		Routx	Voutx
		CHARGE	S/H
	Y+
		AMPLIFIER
	Z+
a			Routy	Vouty
	MUX	DEMUX	S/H
	Z-
	Y-
	X-		Routz	Voutz
			S/H
				Vout
				MUX
SELF-TEST	REFERENCE	TRIMMING CIRCUIT	CLOCK
			Aux_in S1 S0
				AM06049v1

1.1Pin connections and description

Figure 2. Pin connection

Z

1

X

Y

(TOP VIEW) DIRECTIONS OF DETECTABLE ACCELERATIONS

			Reserved
Vdd						NC
	13				1
Aux_in						Reserved
Vout						S0
GND						S1
Voutz						ST
Vouty
	8				6	PD
			uVo
			tx

(BOTTOM VIEW)

AM06050v1

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Block diagram and pin description				LIS352AX
	Table 2.	Pin description
	Pin #		Pin Name	Function
	1		NC	Internally not connected
	2		Reserved	Connect to Vdd
	3		S0	Mux selector 0 (connect to Vdd or to GND)
	4		S1	Mux selector 1 (connect to Vdd or to GND)
	5		ST	Self-test (logic 0: normal mode; logic 1: self-test)
	6		PD	Power-down (logic 0: normal mode; logic 1: power-down mode)
	7		Voutx	Output voltage X channel
	8		Vouty	Output voltage Y channel
	9		Voutz	Output voltage Z channel
	10		GND	0 V supply
	11		Vout	Multiplexer output
	12		Aux_in	Auxiliary input
	13		Vdd	Power supply
	14		Reserved	Connect to Vdd

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LIS352AX	Mechanical and electrical specifications

2 Mechanical and electrical specifications

2.1Mechanical characteristics

@ Vdd=3.3 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		±0.3		mg/°C
	vs temperature
NL	Non linearity(4)	Best fit straight line		±0.5		% FS
CrossAx	Cross-axis(5)			±2		%
An	Acceleration noise	Vdd=3.3 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>2.5nF

a. The product is factory calibrated at 3.3 V. The operational power supply range is specified in Table 4.

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