ST LIS352AR User Manual

LIS352AR

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

Features

■Single voltage supply operation

■±2 g full-scale

■3 acceleration channels plus multiplexed analog output

■Ratiometric output voltage

■Power-down mode

■Embedded self-test

■10000 g high shock survivability

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

Applications

■Free-fall detection for data protection

■Tilting applications

■Gaming and virtual reality input devices

■Antitheft systems and inertial navigation

Description

The LIS352AR is a miniaturized low-power 3-axis linear accelerometer belonging to the “piccolo” 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 circuit which is trimmed to better match the sensing element characteristics.

The LIS352AR 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

LGA-14 (3x5x0.9mm)

capacitors. The self-test capability allows the user to check the functioning of the sensor in the final application.

The device has three analog acceleration outputs, plus an embedded multiplexer that allows for 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

The LIS352AR is provided in a plastic land grid array (LGA) package.

Several years ago ST successfully pioneered the usage 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		Temp.	Package	Packing
		range [°C]
LIS352AR		-40 to +85	LGA-14	Tray
LIS352ARTR		-40 to +85	LGA-14	Tape and reel

February 2010

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www.st.com

Contents	LIS352AR

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
7	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		13
8	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		14

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LIS352AR	Block diagram and pin description

1 Block diagram and pin description

Figure 1. Block diagram

	X+		Routx	Voutx
		CHARGE
	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				LIS352AR
	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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LIS352AR	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		g
So	Sensitivity(3)		0.145*Vdd	0.145*Vdd	0.145*Vdd	V/g
			–5%		+ 5%
SoDr	Sensitivity change vs.	Delta from +25 °C		±0.01		%/°C
	temperature
Voff	Zero-g level(4)	T = 25 °C	Vdd/2-6%	Vdd/2	Vdd/2+6%	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		µg/ Hz
	density
		T = 25 °C
		Vdd=3.3 V	60		900	mV
		X axis
	Self-test output	T = 25 °C
Vt		Vdd=3.3 V	60		900	mV
	voltage change(6),(7)
		Y axis
		T = 25 °C
		Vdd=3.3 V	60		900	mV
		Z axis
Fres	Sensing element	All axes	2.0			kHz
	resonant frequency(8)
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 ratiometric to supply voltage

4.Guaranteed by design

a.The product is factory calibrated at 3.3 V. The operational power supply range is specified in Table 4. Since the device is ratiometric, Voff, So and Vt parameters will vary with supply voltage.

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