October 2009 Doc ID 16579 Rev 1 1/14
14
LPY430AL
MEMS motion sensor:
dual-axis pitch and yaw ±300 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® RoHS and “Green” compliant
(see Section 6)
Applications
■Pointing devices, remote and game controllers
■Motion control with user interface
■GPS navigation systems
■Industrial and robotics
Description
The LPY430AL 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).
The LPY430AL has a full scale of ±300 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 LPY430AL 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-28 (4x5x1 mm)
Table 1. Device summary
Order code Temperature range (°C) Package Packing
LPY430AL -40 to +85 LGA-28 (4x5x1) Tray
LPY430ALTR -40 to +85 LGA-28 (4x5x1) Tape and reel
www.st.com
Contents LPY430AL
2/14 Doc ID 16579 Rev 1
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 High pass filter reset (HP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.5 Sleep mode, self-test and power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 Output response vs. rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
LPY430AL Block diagram and pin description
Doc ID 16579 Rev 1 3/14
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 LPY430AL
4/14 Doc ID 16579 Rev 1
Table 2. Pin description
Pin # Pin name Analog function
1 OUT Z Z rate signal output voltage (not amplified)
2 NC Internally not connected
3 NC Internally not connected
4 NC Internally not connected
5 4xIN Z Input of 4x amplifier
6 NC Internally not connected
7 4xOUTZ Z rate signal output voltage (amplified)
8 NC Internally not connected
9 Vdd Power supply
10 NC Internally not connected
11 NC Internally not connected
12 NC Internally not connected
13 NC Internally not connected
14 4xOUTX X rate signal output voltage (amplified)
15 NC Internally not connected
16 4xIN X Input of 4x amplifier
17 VCONT PLL filter connection pin #17
18 FILTVDD PLL filter connection pin #18
19 Vdd Reserved. connect to Vdd
20 OUTX X rate signal output voltage (not amplified)
21 NC Internally not connected
22 Vref Reference voltage
23 NC Internally not connected
24 HP High-pass filter reset (logic 0: normal operation mode;
logic1: external high-pass filter is reset)
25 Res Reserved. Leave unonnected or connect to Vdd
26 GND 0V supply voltage
27 ST Self-test (see Table 6)
28 SLEEP/PD Sleep mode / power-down mode (see Table 6)
LPY430AL Mechanical and electrical specifications
Doc ID 16579 Rev 1 5/14
2 Mechanical and electrical specifications
2.1 Mechanical characteristics
Vdd = 3 V, T = 25 °C unless otherwise noted(a)
a. The product is factory calibrated at 3 V. The operational power supply range is specified in Table 4.
Table 3. Mechanical characteristics
Symbol Parameter Test condition Min. Typ.(1) Max. Unit
FSA Measurement range 4x OUT (amplified) ±300 dps
FS OUT (not amplified) ±1200 dps
SoA Sensitivity(2) 4x OUT (amplified) 3.33 mV/dps
So OUT (not amplified) 0.83 mV/dps
SoDr Sensitivity change vs.
temperature Delta from 25°C 0.07 %/°C
Voff Zero-rate level(3) 1.5 V
Vref Reference voltage 1.5 V
OffDr Zero-rate level change
vs. temperature Delta from 25°C 0.05 dps/°C
NL Non linearity Best fit straight line ±1 % FS
BW Bandwidth(3) 140 Hz
Vst Self-test output
change 250(4) mV
Rn Rate noise density 0.018 dps/√ Hz
Top 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.
Mechanical and electrical specifications LPY430AL
6/14 Doc ID 16579 Rev 1
2.2 Electrical characteristics
Vdd =3 V, T=25 °C unless otherwise noted(b)
b. The product is factory calibrated at 3 V
Table 4. Electrical characteristics
Symbol Parameter Test condition Min. Typ.(1) Max. Unit
Vdd Supply voltage 2.7 3 3.6 V
Idd Supply current SLEEP/PD pin connected
to GND 6.8 mA
IddSl Supply current sleep
mode
SLEEP/PD, ST pin
connected to Vdd 2.1 mA
IddPdn Supply current in power-
down mode
SLEEP/PD pin connected
to Vdd 15µA
VST Self-test input Logic 0 level 0 0.2*Vdd V
Logic 1 level 0.8*Vdd Vdd
VPD Power-down input Logic 0 level 0 0.2*Vdd V
Logic 1 level 0.8*Vdd Vdd
To p Operating temperature
range -40 +85 °C
1. Typical specifications are not guaranteed.
LPY430AL Absolute maximum ratings
Doc ID 16579 Rev 1 7/14
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
TSTG Storage temperature range -40 to +125 °C
A Acceleration 3000 for 0.5 ms g
10000 for 0.1 ms g
ESD Electrostatic discharge protection 2 (HBM) 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
Terminology LPY430AL
8/14 Doc ID 16579 Rev 1
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 High pass filter reset (HP)
The LPY430AL 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 LPY430AL 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).
LPY430AL Terminology
Doc ID 16579 Rev 1 9/14
Table 6. Sleep mode and Power-down mode configuration
Operating mode ST pin SLEEP/PD pin
Normal mode 0 0
Power-down 0 1
Self-test 1 0
Sleep mode 1 1
Application hints LPY430AL
10/14 Doc ID 16579 Rev 1
5 Application hints
Figure 3. LPY430AL electrical connections and external components values
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).
The LPY430AL 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 LPY430AL 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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LPY430AL Application hints
Doc ID 16579 Rev 1 11/14
5.1 Output response vs. rotation
Figure 4. Output response vs. rotation
5.2 Soldering information
The LGA package is compliant with the ECOPACK®, 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 LPY430AL
12/14 Doc ID 16579 Rev 1
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-28: mechanical data and package dimensions
A1 1.1
A2 0.855
A30.200
D1 3.850 4.000 4.150
E1 4.850 5.000 5.150
L1 3.75
L2 2.75
N1 0.500
M 0.075
P1 2.200
P2 1.700
T1 0.265 0.325 0.385
T2 0.19 0.250 0.310
d 0.200
k 0.050
h 0.100
LGA-28 (4x5x1mm)
Land Grid Array Package
8181393A
LPY430AL Revision history
Doc ID 16579 Rev 1 13/14
7 Revision history
Table 7. Document revision history
Date Revision Changes
29-Oct-2009 1 Initial release.
LPY430AL
14/14 Doc ID 16579 Rev 1
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