high performance ±1000 dps analog yaw-rate gyroscope
Features
■ 2.7 V to 3.6 V single supply operation
■ Wide extended operating temperature range
(-40°C to +85°C)
■ High stability over temperature
■ Analog absolute angular-rate output
■ Integrated low-pass filters
■ Low power consumption
■ Sleep mode
■ Embedded power-down
■ Embedded self-test
■ High shock and vibration survivability
■ ECOPACK
(see Section 6)
Applications
®
RoHS and “Green” compliant
LY3100ALH
MEMS motion sensor:
LGA-10
The LY3100ALH has a full scale of ±1000 dps and
is capable of detecting rates with a -3 dB
bandwidth up to 140 Hz.
The device includes a sensing element composed
of a single driving mass, kept in continuous
oscillation and capable of reacting, based on the
Coriolis principle, when an angular rate is applied.
A CMOS IC provides the measured angular rate
to the external world through an analog output
voltage, allowing high levels of integration and
production trimming to better match sensing
element characteristics.
(3x5x1 mm)
■ Gaming applications
■ Pointing devices, remote and game controllers
■ Motion control with user interface
■ Industrial and robotics
ST's family of gyroscopes leverages on the
mature and robust manufacturing process already
used for the production of micro-machined
accelerometers.
ST is already in the field with several hundred
million sensors which have received excellent
Description
The LY3100ALH is a high performance low-power
single-axis micromachined gyroscope capable of
measuring angular rate along yaw axis.
It provides excellent temperature stability and
high resolution over extended operating
temperature range (-40°C to +85°C).
acceptance from the market in terms of quality,
reliability and performance.
The LY3100ALH is available in a plastic land grid
array (LGA) package, which ST successfully
pioneered 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
LY3100ALH -40 to +85 LGA-10 (3x5x1) Tray
LY3100ALHTR -40 to +85 LGA-10 (3x5x1) Tape and reel
October 2009 Doc ID 16570 Rev 1 1/13
www.st.com
13
Contents LY3100ALH
Contents
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin 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-rate level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.3 Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.4 Sleep mode, self test and power down . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1 Output response vs. rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13 Doc ID 16570 Rev 1
LY3100ALH Block diagram and pin description
3
1 Block diagram and pin description
Figure 1. Block diagram
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Doc ID 16570 Rev 1 3/13
Block diagram and pin description LY3100ALH
Table 2. Pin description
Pin # Pin name Analog function
1 Vdd Power supply
2 ST Self-test (see Table 6)
3 VCONT PLL filter connection
4 GND 0V supply voltage
5 Res Leave unconnected or connect to Vdd
6 OUTZ Z axis output voltage
7 Vref Reference voltage
8 SLEEP/PD Sleep mode / power-down mode (see Table 6)
9 Vdd Power supply
10 Res Leave unconnected or connect to Vdd
4/13 Doc ID 16570 Rev 1
LY3100ALH Mechanical and electrical specifications
2 Mechanical and electrical specifications
2.1 Mechanical characteristics
Vdd = 3 V, T = 25 °C unless otherwise noted
Table 3. Mechanical characteristics
Symbol Parameter Test condition Min. Typ.
FS Measurement range ±1000 dps
So Sensitivity
SoDr
Sensitivity change vs.
temperature
Voff Zero-rate level
OffDr
Zero-rate level change
vs. temperature
NL Non linearity Best fit straight line ±1 % FS
BW Bandwidth
Vst Self-test output change 100
Rn Rate noise density 0.016 dps/√ Hz
Top
1. Typical specifications are not guaranteed.
2. Sensitivity and zero-rate offset are not ratiometric to supply voltage.
3. The product is capable of measuring angular rates extending from DC to the selected BW.
4. Self test typical absolute value.
Operating temperature
range
(2)
Delta from 25°C 0.01 %/°C
(3)
Delta from 25°C 0.02 dps/°C
(3)
(a)
(1)
1.1 mV/dps
1.5 V
140 Hz
(4)
-40 +85 °C
Max. Unit
mV
a. The product is factory calibrated at 3 V. The operational power supply range is specified in Table 4.
Doc ID 16570 Rev 1 5/13
Mechanical and electrical specifications LY3100ALH
2.2 Electrical characteristics
Vdd = 3 V, T = 25 °C unless otherwise noted
Table 4. Electrical characteristics
Symbol Parameter Test condition Min. Typ.
Vdd Supply voltage 2.7 3 3.6 V
Idd Supply current 4.2 mA
IddSl
IddPdn
Supply current sleep
mode
Supply current powerdown mode
(b)
(1)
2.2 mA
5 µA
Max. Unit
ST Self-test input
V
VPD Power-down input
To p
1. Typical specifications are not guaranteed.
Operating temperature
range
Logic 0 level 0 0.2*Vdd
V
Logic 1 level 0.8*Vdd Vdd
Logic 0 level 0 0.2*Vdd
V
Logic 1 level 0.8*Vdd Vdd
-40 +85 °C
b. The product is factory calibrated at 3 V
6/13 Doc ID 16570 Rev 1
LY3100ALH Absolute maximum ratings
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 Maximum value Unit
Vdd Supply voltage -0.3 to 6 V
Vin Input voltage on any control pin (SLEEP/PD, ST) -0.3 to Vdd +0.3 V
A Acceleration
T
ESD Electrostatic discharge protection 2 (HBM) kV
Storage temperature range -40 to +125 °C
STG
3000 for 0.5 ms g
10000 for 0.1 ms 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 16570 Rev 1 7/13
Terminology LY3100ALH
4 Terminology
4.1 Sensitivity
An angular rate gyroscope is a device that produces a positive-going output voltage for
counterclockwise 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.
4.2 Zero-rate level
Zero-rate level describes the actual output signal if there is no angular rate present. The
zero-rate 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. This value changes very
little over temperature and time.
4.3 Self-test
Self-test allows testing of the mechanical and electrical part of the sensor, allowing the
seismic mass to be moved by means of an electrostatic test-force. The self-test function is
off when the ST pin is connected to GND. When the ST pin is tied to Vdd, an actuation force
is applied to the sensor, emulating a definite Coriolis force. In this case the sensor output
exhibits a voltage change in its DC level which is also dependent on the supply voltage.
When ST is active, the device output level is given by the algebraic sum of the signals
produced by the velocity acting on the sensor and by the electrostatic test-force. If the output
signals change within the amplitude specified in Table 3, then the mechanical element is
working properly and the parameters of the interface chip are within the defined
specifications.
4.4 Sleep mode, self test and power down
The LY3100ALH enables advanced power-saving features thanks to the availability of three
different operating modes. When the device is set in a Sleep mode configuration, the
reading chain is completely turned off, resulting in low power consumption. In this condition
the device turn-on time is significantly reduced, allowing simple external power cycling.
In accordance with the table below, the user can select the desired operating mode using
two dedicated pins (ST and SLEEP/PD).
Table 6. Sleep mode and Power-down mode configuration
Operating mode ST pin SLEEP/PD pin
Normal mode 0 0
Sleep mode 0 1
Self-test 1 0
Power-down 1 1
8/13 Doc ID 16570 Rev 1
LY3100ALH Application hints
5 Application hints
Figure 3. LY3100ALH electrical connections and external components values
Supply
2.2Ohm
Vref
OUT Z
1 µF
LDO
100 nF
SLEEP/PD
GND
(TOP VIEW)
DIRECTION OF THE
DETECTABLE
ANGULAR RATE
+
Ω
GND
9
10 5
TOP VIEW
1
z
ST
6
4
C1
GND
10nF
C2
10kOhm470nF
R1
GND
AM03841v1
Power supply decoupling capacitors should be placed in combination with an LDO regulator
(common design practice).
The LY3100ALH IC includes a PLL (phase-locked loop) circuit to synchronize driving and
sensing interfaces. Capacitors and resistors must be added at VCONT pin 3 (as shown in
Figure 3) to implement a low-pass filter.
Doc ID 16570 Rev 1 9/13
Application hints LY3100ALH
5.1 Output response vs. rotation
Figure 4. Output response vs. rotation
+Ω
z
Steady state position
OUTZ = 1.5V
5.2 Soldering information
The LGA package is compliant with the ECOPACK®, RoHS and “Green” standard.
It is qualified for soldering heat resistance in accordance with JEDEC J-STD-020.
Leave “pin 1 indicator” unconnected during soldering.
Land pattern and soldering recommendations are available at www.st.com
+Ω
z
Positive rotations as, indicated by the arrow,
increase output value over zero-rate level:
OUTZ= 1.5V + So*1000 = 2.6V
AM03842v1
10/13 Doc ID 16570 Rev 1
LY3100ALH Package information
6 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 5. LGA-10: mechanical data and package dimensions
A1 1.100
A2 0.855
A3 0.200
D1 2.850 3.000 3.150
E1 4.850 5.000 5.150
L0.635
L1 4.100
L2 2.200
N1 1.415
N2 1.100
M0.075
P1 1.300
P2 0.500
T1 0.600
T2 0.700
d0.200
k0.050
h0.100
LGA-10 (3x5x1mm)
Land Grid Array Package
8161636A
Doc ID 16570 Rev 1 11/13
Revision history LY3100ALH
7 Revision history
Table 7. Document revision history
Date Revision Changes
29-Oct-2009 1 First issue.
12/13 Doc ID 16570 Rev 1
LY3100ALH
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Doc ID 16570 Rev 1 13/13
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