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LPY4150AL
MEMS motion sensor: dual-axis pitch and yaw 1500 dps analog gyroscope
Features

2.7 V to 3.6 V single-supply operation Wide operating temperature range (-40 C to +85 C) High stability over temperature Analog absolute angular-rate outputs Two separate outputs for each axis (1x and 4x amplified) Integrated low-pass filters Low power consumption Embedded power-down Embedded self-test Sleep mode High shock and vibration survivability ECOPACK(R) RoHS and "Green" compliant (see Section 6)
LGA-28 (4x5x1 mm)
The LPY4150AL has a full scale of 1500 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 LPY4150AL 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.
Applications

Gaming applications Pointing devices, remote and game controllers Motion control with user interface Industrial and robotics
Description
The LPY4150AL is a low-power dual-axis micromachined gyroscope capable of measuring angular rate along pitch and yaw axes. It provides excellent temperature stability and high resolution over an extended operating temperature range (-40 C to +85 C). Table 1. Device summary
Temperature range (C) -40 to +85 -40 to +85
Order code LPY4150AL LPY4150ALTR
Package LGA-28 (4x5x1) LGA-28 (4x5x1)
Packing Tray Tape and reel
October 2009
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Contents
LPY4150AL
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 4.5 Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Zero-rate level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 High pass filter reset (HP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Sleep mode, self-test and power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 5.2 Output response vs. rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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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
LPY4150AL
Table 2.
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Pin description
Pin name OUT Z NC NC NC 4xIN Z NC 4xOUTZ NC Vdd NC NC NC NC 4xOUTX NC 4xIN X VCONT FILTVDD Vdd OUTX NC Vref NC HP Res GND ST SLEEP/PD Analog function Z rate signal output voltage (not amplified) Internally not connected Internally not connected Internally not connected Input of 4x amplifier Internally not connected Z rate signal output voltage (amplified) Internally not connected Power supply Internally not connected Internally not connected Internally not connected Internally not connected X rate signal output voltage (amplified) Internally not connected Input of 4x amplifier PLL filter connection pin #17 PLL filter connection pin #18 Reserved. connect to Vdd X rate signal output voltage (not amplified) Internally not connected Reference voltage Internally not connected High-pass filter reset (logic 0: normal operation mode; logic1: external high-pass filter is reset) Reserved. Leave unonnected or connect to Vdd 0V supply voltage Self-test (see Table 6) Sleep mode / power-down mode (see Table 6)
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Mechanical and electrical specifications
2
2.1
Table 3.
Symbol FSA FS SoA So SoDr Voff Vref OffDr NL BW Vst Rn Top
Mechanical and electrical specifications
Mechanical characteristics
Vdd = 3 V, T = 25 C unless otherwise noted(a) Mechanical characteristics
Parameter Measurement range Sensitivity(2) Sensitivity change vs. temperature Zero-rate level(3) Reference voltage Zero-rate level change Delta from 25C vs. temperature Non linearity Bandwidth
(3)
Test condition 4x OUT (amplified) OUT (not amplified) 4x OUT (amplified) OUT (not amplified) Delta from 25C
Min.
Typ.(1) 1500 6000 0.67 0.167 0.07 1.5 1.5 0.25 1 140 250(4) 0.075
Max.
Unit dps dps mV/dps mV/dps %/C V V dps/C % FS Hz mV dps/Hz
Best fit straight line
Self-test output change Rate noise density Operating temperature range -40
+85
C
1. Typical specifications are not guaranteed. 2. Sensitivity and zero-rate level 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
LPY4150AL
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 in powerdown mode Self-test input Logic 1 level Logic 0 level 0.8*Vdd 0 0.8*Vdd -40 Vdd 0.2*Vdd V Logic 1 level Vdd +85 C SLEEP/PD pin connected to GND SLEEP/PD, ST pin connected to Vdd SLEEP/PD pin connected to Vdd Logic 0 level 0 Test condition Min. 2.7 Typ.(1) 3 6.8 2.1 1 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 TSTG A ESD Supply voltage Input voltage on any control pin (SLEEP/PD, ST) Storage temperature range Acceleration 10000 for 0.1 ms Electrostatic discharge protection 2 (HBM)
Absolute maximum ratings
Ratings Maximum value -0.3 to 6 -0.3 to Vdd +0.3 -40 to +125 3000 for 0.5 ms Unit V V C g g 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
LPY4150AL
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
High pass filter reset (HP)
The LPY4150AL provides the possibility to reset the optional external high-pass filter by applying a high logic value to the HP pad. This procedure ensures faster response, especially during overload conditions. Moreover, this operation is recommended each time the device is powered.
4.5
Sleep mode, self-test and power-down
The LPY4150AL 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).
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Terminology
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 Power-down Self-test Sleep mode
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Application hints
LPY4150AL
5
Application hints
Figure 3. LPY4150AL electrical connections and external components values
Power supply decoupling capacitors (100 nF ceramic or polyester + 10 F aluminum) should be placed as near as possible to the device (common design practice). The LPY4150AL allows band limiting of the output rate response through the use of an external low-pass filter (recommended) in addition to the embedded low-pass filter (ft = 140 Hz). The 4xOUTX and 4xOUTZ are, respectively, OUTX and OUTZ amplified output lines, internally buffered to ensure low output impedance. If external low-pass filtering is not applied, it is mandatory to short-circuit pin 1 to pin 5 and pin 16 to pin 20, respectively, when amplified outputs are used. When only a non-amplified output is used (OUTX/OUTZ), it is recommended to set pin 5 and 16 to a fixed reference voltage (Vref). The LPY4150AL IC includes a PLL (phase-locked loop) circuit to synchronize driving and sensing interfaces. Capacitors and resistors must be added at the FILTVDD and VCONT pins (as shown in Figure 3) to implement a low-pass filter.
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Application hints
5.1
Output response vs. rotation
Figure 4. Output response vs. rotation
5.2
Soldering information
The LGA package is compliant with the ECOPACK(R), RoHS and "Green" standards. 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
LPY4150AL
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-28: mechanical data and package dimensions
A1 A2 A3 D1 E1 L1 L2 N1 M P1 P2 T1 T2 d k h 0.265 0.19 3.850 4.850 0.855 0.200 4.000 5.000 3.75 2.75 0.500 0.075 2.200 1.700 0.325 0.250 0.200 0.050 0.100
1.1
4.150 5.150
0.385 0.310
LGA-28 (4x5x1mm) Land Grid Array Package
8181393A
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Revision history
7
Revision history
Table 7.
Date 29-Oct-2009
Document revision history
Revision 1 Initial release Changes
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LPY4150AL
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