Page 1
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
Page 2
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
Page 3
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)
Page 4
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
Page 5
L3G3250A Mechanical and electrical specifications
2 Mechanical and electrical specifications
2.1 Mechanical characteristics
@ Vdd = 3.0 V, T = 25 °C unless otherwise noted.
Table 3. Mechanical characteristics
Symbol Parameter Test condition Min. Typ.
FS Measurement range
So Sensitivity
SoDr
ZRL Zero-rate level
Vref Reference voltage 1.5 V
OffDr
BW Bandwidth 140 Hz
Top
1. The product is factory calibrated at 3.0 V. The operational power supply range is specified in Table 4.
2. Typical specifications are not guaranteed.
3. Guaranteed by design.
Sensitivity change vs.
temperature
Zero-rate level change
vs. temperature
NL Non linearity
Rn Rate noise density 0.015
Operating temperature
range
(3)
FS = 625 dps 2
FS = 2500 dps 0.5
FS = 625 dps 1.5
FS = 2500 dps 1.5
Best fit straight line 2 % FS
(1)
(2)
±625
±2500
±0.017 %/°C
±0.08 dps/°C
-40 +85 °C
Max. Unit
dps
mV/dps
V
dps/
Hz
Doc ID 022118 Rev 1 5/12
Page 6
Mechanical and electrical specifications L3G3250A
2.2 Electrical characteristics
@ Vdd = 3.0 V, T = 25 °C unless otherwise noted.
Table 4. Electrical characteristics
Symbol Parameter Test condition Min. Typ.
Vdd Supply voltage
Idd Supply current 6.3 mA
IddSL
IddPdn
To p
1. The product is factory calibrated at 3.0 V.
2. Typical specifications are not guaranteed.
3. Sleep mode introduces a faster turn-on time relative to power-down mode.
Supply current
in sleep mode
Supply current in
power-down mode
Operating temperature
range
(3)
(1)
(2)
2.4 3.0 3.6 V
2mA
-
5 µA
-40 +85 °C
Max. Unit
6/12 Doc ID 022118 Rev 1
Page 7
L3G3250A Mechanical and electrical specifications
2.3 Absolute maximum ratings
Stresses above those listed as “Absolute maximum ratings” may cause permanent damage
to the device. This is a stress rating only and functional operation of the device under these
conditions is not implied. Exposure to maximum rating conditions for extended periods may
affect device reliability.
Table 5. Absolute maximum ratings
Symbol Ratings Value Unit
Vdd Supply voltage - 0.3 to 4.8 V
Vin Input voltage on any control pin (SLEEP, FS, ST) -0.3 to Vdd +0.3 V
T
ESD Electrostatic discharge protection 2 (HBM) kV
Note: Supply voltage on any pin should never exceed 4.8 V.
Storage temperature range -40 to +125 °C
STG
Sg Acceleration g for 0.1 ms 10,000 g
This is a mechanical shock sensitive device, improper handling can cause permanent
damage to the part
This is an ESD sensitive device, improper handling can cause permanent damage to
the part
Doc ID 022118 Rev 1 7/12
Page 8
Mechanical and electrical specifications L3G3250A
2.4 Terminology
2.4.1 Sensitivity
An angular rate gyroscope is a device that produces a positive-going digital output for
counter-clockwise rotation around the sensitive axis considered. Sensitivity describes the
gain of the sensor and can be determined by applying a defined angular velocity to it. This
value changes very little over temperature and time.
2.4.2 Zero-rate level
Zero-rate level describes the actual output signal if there is no angular rate present. Zerorate level of precise MEMS sensors is, to some extent, a result of stress to the sensor and
therefore zero-rate level can slightly change after mounting the sensor onto a printed circuit
board or after exposing it to extensive mechanical stress.
2.4.3 Self-test (ST)
Self-test allows the testing of the mechanical and electric parts of the sensor, allowing the
seismic mass to be moved by means of an electrostatic test-force. When the ST is activated
by the IC, an actuation force is applied to the sensor, emulating a definite Coriolis force. In
this case the sensor output will exhibit a change in the output. When ST is active, the device
output is given by the algebraic sum of the signals produced by the velocity acting on the
sensor and by the electrostatic test-force.
2.5 Sleep mode, self-test and power-down
The L3G3250A enables advanced power saving functionality thanks to the different
operating modes available. When the device is set in the Sleep mode configuration, the
reading chain is completely turned off, allowing lower power consumption. In this condition,
the device turn-on time is significantly reduced permitting simpler external power cycling.
The user can select the desired operating mode through two dedicated pins.
Table 6. Sleep mode, self-test and power-down mode configuration
Operating mode ST pin Sleep pin
Normal mode 0 0
Power-down 0 1
Self-test 1 0
Sleep mode 1 1
2.6 Soldering information
The LGA package is compliant with the ECOPACK®, RoHS and “Green” standard.
It is qualified for soldering heat resistance according to JEDEC J-STD-020.
Leave “Pin 1 Indicator” unconnected during soldering.
Land pattern and soldering recommendations are available at www.st.com/mems
8/12 Doc ID 022118 Rev 1
.
Page 9
L3G3250A Application hints
9nF
9nF
3 Application hints
Figure 2. L3G3250A electrical connections and external component values
+Ω
OUT_Y
X
(TOP VIEW)
DIRECTIONS OF THE
DETECTABLE
ANGULAR RATES
+Ω
+Ω
OUT_P
OUT_R
GND
FS
SLEEP
GND
RES
VDD GND GND
13
BOTTOM
9
RES
VPUMP
100 nF
VREF
VPUMP
VIEW
VDD
1
5
OUT_P
10 nF (25V) ±10%
GND
10 µF
NC
ST
HPS
OUT_Y
OUT_R
Note: The capacitor on pin 14 must guarantee a 1 nF value under 11 V bias condition.
Power supply decoupling capacitors (100 nF ceramic or polyester + 10 µF aluminum) should
be placed as near as possible to the device (common design practice).
A 10 nF, 25 V class capacitor connected to pin 14 is required for proper operation of the
device.
3.1 Full scale (FS) pin operation
Figure 3. FS pin operation
FS pin = ‘0’ (for each axis)
OUT 625dps FS
FS pin = ‘1’ (for each axis)
OUT 2500dps FS
AM10136V1
AM10137V1
Doc ID 022118 Rev 1 9/12
Page 10
Package information L3G3250A
4 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK is an ST trademark.
Figure 4. LGA-16 (3.5x3.0x1.0): mechanical data and package dimensions
Dimensions
Ref.
A1 1.000 1.027
A2 0.800
A3 0.200
D1 2.850 3.000 3 .150
E1 3.350 3.500 3.650
L1 1.000 1.060
L2 2.000 2.060
N1 0.500
N2 1.000
M 0.040 0.100 0.160
P1 0.875
P2 1.275
T1 0.2900.350 0.410
T2 0.190 0.250 0.310
d 0.150
k 0.050
Min. Typ. Max.
mm
LGA-16 (3.5x3.0x1.0 mm)
Land Grid Array Package
Outline and
mechanical data
10/12 Doc ID 022118 Rev 1
8297582_A
Page 11
L3G3250A Revision history
5 Revision history
Table 7. Document revision history
Date Revision Changes
25-Aug-2011 1 Initial release.
Doc ID 022118 Rev 1 11/12
Page 12
L3G3250A
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