ST L3G3250A User Manual

Features

■ Two selectable full scales (625/2500 dps)

■ Embedded self-test

■ Wide supply voltage range: 2.4 V to 3.6 V

■ Embedded power-down and sleep mode

■ Embedded low-pass filter

■ Integrated high-pass filter reset

■ High shock survivability

■ Extended operating temperature range (-40 °C

to 85 °C)

■ ECOPACK

®

RoHS and “Green” compliant

Applications

■ Gaming and virtual reality input devices

■ Motion control with MMI (man-machine

interface)

■ GPS navigation systems

■ Appliances and robotics

L3G3250A

MEMS motion sensor:

three-axis analog gyroscope

Preliminary data

LGA-16

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

The L3G3250A is available in a plastic land grid
array (LGA) package and can operate within a
temperature range from -40 °C to +85 °C.

(3.5x3.0x1.0 mm)

Description

The L3G3250A is a low-power three-axis angular
rate sensor.

It includes a sensing element and an IC interface
capable of providing the measured angular rate to
the external world via three analog outputs.

The sensing element is manufactured using a
dedicated micro-machining process developed by
STMicroelectronics to produce inertial sensors
and actuators on silicon wafers.

Table 1. Device summary

Order code Temperature range (°C) Package Packing

L3G3250A -40 to +85 LGA-16 (3.5x3.0x1.0) Tray

L3G3250ATR -40 to +85 LGA-16 (3.5x3.0x1.0) Tape and reel

August 2011 Doc ID 022118 Rev 1 1/12

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.

www.st.com

12

Contents L3G3250A

Contents

1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

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

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

2.3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.4 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4.1 Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4.2 Zero-rate level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4.3 Self-test (ST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.5 Sleep mode, self-test and power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.6 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1 Full scale (FS) pin operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2/12 Doc ID 022118 Rev 1

L3G3250A Pin description

1 Pin description

1.1 Pin description

Figure 1. Pin connection

+Ω

OUT_Y

VREF

VIEW

VDD

VDD

1

5

OUT_P

NC

ST
HPS

OUT_Y
OUT_R

AM10135V1

X

+Ω

+Ω

(TOP VIEW)
DIRECTIONS OF THE

DETECTABLE
ANGULA RATES

OUT_P

OUT_R

GND
GND

FS

SLEEP

RES

VPUMP

13

BOTTOM

9

RES

Note: The vibration of the structure is maintained by drive circuitry in a feedback loop. The sensing

signal is filtered and appears as an analog output.

Table 2. Pin description

Pin# Name Function

1 NC Internally not connected

2 ST Self-test pin

3HPS

4 OUT_Y Yaw axis angular rate output

5 OUT_R Roll axis angular rate output

6 OUT_P Pitch axis angular rate output

7 VDD Power supply

8 RES Reserved, leave unconnected

9 RES Reserved, leave unconnected

10 SLEEP Sleep mode selection

11 FS Full scale selection

12 GND 0 V supply voltage

High-pass filter reset
(‘1’: reset of external high-pass filter; ‘0’: normal mode)

13 GND 0 V supply voltage

14 VPUMP Charge pump capacitor connection pin

Doc ID 022118 Rev 1 3/12

(1)

Pin description L3G3250A

Table 2. Pin description (continued)

Pin# Name Function

15 VREF Reference output voltage

16 VDD Power supply

1. To be connected to GND through 10 nF, 25 V ceramic capacitor. 1nF min value must be guaranteed under
11 V bias condition.

4/12 Doc ID 022118 Rev 1