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LY3100ALH
MEMS motion sensor: high performance 1000 dps analog yaw-rate gyroscope
Features

2.7 V to 3.6 V single supply operation Wide extended operating temperature range (-40C to +85C) 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(R) RoHS and "Green" compliant (see Section 6) 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. 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 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.
LGA-10 (3x5x1 mm)
Applications

Gaming applications Pointing devices, remote and game controllers Motion control with user interface Industrial and robotics
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 (-40C to +85C).
Table 1.
Device summary
Temperature range (C) -40 to +85 -40 to +85 Package LGA-10 (3x5x1) LGA-10 (3x5x1) Packing Tray Tape and reel
Order code LY3100ALH LY3100ALHTR
October 2009
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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 2.2 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 4
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 4.2 4.3 4.4 Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Zero-rate level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Sleep mode, self test and power down . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1 5.2 Output response vs. rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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Block diagram and pin description
1
Block diagram and pin description
Figure 1. Block diagram
1.1
Pin description
Figure 2. Pin connection
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Block diagram and pin description
LY3100ALH
Table 2.
Pin # 1 2 3 4 5 6 7 8 9 10
Pin description
Pin name Vdd ST VCONT GND Res OUTZ Vref SLEEP/PD Vdd Res Power supply Self-test (see Table 6) PLL filter connection 0V supply voltage Leave unconnected or connect to Vdd Z axis output voltage Reference voltage Sleep mode / power-down mode (see Table 6) Power supply Leave unconnected or connect to Vdd Analog function
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Mechanical and electrical specifications
2
2.1
Mechanical and electrical specifications
Mechanical characteristics
Vdd = 3 V, T = 25 C unless otherwise noted (a)
Table 3.
Symbol FS So SoDr Voff OffDr NL BW Vst Rn Top
Mechanical characteristics
Parameter Measurement range Sensitivity
(2)
Test condition
Min.
Typ.(1) 1000 1.1
Max.
Unit dps mV/dps %/C V dps/C % FS Hz mV dps/Hz
Sensitivity change vs. temperature Zero-rate level(3) Zero-rate level change vs. temperature Non linearity Bandwidth
(3)
Delta from 25C
0.01 1.5
Delta from 25C Best fit straight line
0.02 1 140 100
(4)
Self-test output change Rate noise density Operating temperature range -40
0.016 +85
C
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.
a. The product is factory calibrated at 3 V. The operational power supply range is specified in Table 4.
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Mechanical and electrical specifications
LY3100ALH
2.2
Electrical characteristics
Vdd = 3 V, T = 25 C unless otherwise noted (b)
Table 4.
Symbol Vdd Idd IddSl IddPdn
Electrical characteristics
Parameter Supply voltage Supply current Supply current sleep mode Supply current powerdown mode Logic 0 level 0 0.8*Vdd 0 0.8*Vdd -40 Self-test input Logic 1 level Logic 0 level Vdd 0.2*Vdd V Logic 1 level Vdd +85 C Test condition Min. 2.7 Typ.(1) 3 4.2 2.2 5 0.2*Vdd V Max. 3.6 Unit V mA mA A
VST
VPD
Power-down input Operating temperature range
Top
1. Typical specifications are not guaranteed.
b. The product is factory calibrated at 3 V
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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.
Symbol Vdd Vin A TSTG ESD Supply voltage Input voltage on any control pin (SLEEP/PD, ST) Acceleration 10000 for 0.1 ms Storage temperature range Electrostatic discharge protection -40 to +125 2 (HBM)
Absolute maximum ratings
Ratings Maximum value -0.3 to 6 -0.3 to Vdd +0.3 3000 for 0.5 ms Unit V V g g C kV
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
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Terminology
LY3100ALH
4
4.1
Terminology
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
ST pin 0 0 1 1 SLEEP/PD pin 0 1 0 1
Operating mode Normal mode Sleep mode Self-test Power-down
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Application hints
5
Application hints
Figure 3. LY3100ALH electrical connections and external components values
Supply
2.2Ohm
1 F
LDO
GND
100 nF
SLEEP/PD Vref
OUT Z
GND
9 10 1
+
6
TOP VIEW
5 4
GND
z
ST 10nF 470nF
C2
10kOhm
(TOP VIEW) DIRECTION OF THE DETECTABLE ANGULAR RATE
C1
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.
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Application hints
LY3100ALH
5.1
Output response vs. rotation
Figure 4. Output response vs. rotation
+
z
+
z
Steady state position OUTZ = 1.5V
Positive rotations as, indicated by the arrow, increase output value over zero-rate level: OUTZ= 1.5V + So*1000 = 2.6V
AM03842v1
5.2
Soldering information
The LGA package is compliant with the ECOPACK(R), 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
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Package information
6
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) 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 A2 A3 D1 E1 L L1 L2 N1 N2 M P1 P2 T1 T2 d k h 2.850 4.850 0.855 0.200 3.000 5.000 0.635 4.100 2.200 1.415 1.100 0.075 1.300 0.500 0.600 0.700 0.200 0.050 0.100
1.100
3.150 5.150
LGA-10 (3x5x1mm) Land Grid Array Package
8161636A
Doc ID 16570 Rev 1
11/13
Revision history
LY3100ALH
7
Revision history
Table 7.
Date 29-Oct-2009
Document revision history
Revision 1 First issue. Changes
12/13
Doc ID 16570 Rev 1
LY3100ALH
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Doc ID 16570 Rev 1
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