LPR430AL

LPR430AL MEMS motion sensor: dual-axis pitch and roll ±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) LGA-28 (4x5x1 mm) The LPR430AL 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. LPR430AL is provided in plastic land grid array (LGA) package. Several years ago ST pioneered successfully the usage of this package for accelerometers. Today ST has the widest manufacturing capability and strongest expertise in the world for production of sensors in plastic LGA packages. Applications ■ ■ ■ ■ Pointing devices, remote and game controllers Motion tracking with user interface GPS navigation systems Industrial and robotics Description The LPR430AL is a low-power dual-axis micromachined gyroscope capable of measuring angular rate along pitch and roll axes. It provides excellent temperature stability and high resolution over an extended operating temperature range (-40 °C to +85 °C). Table 1. Device summary Order code LPR430AL LPR430ALTR Temperature range (°C) -40 to +85 -40 to +85 Package LGA-28 (4x5x1) LGA-28 (4x5x1) Packing Tray Tape and reel October 2009 Doc ID 16574 Rev 1 1/14 www.st.com 14 Contents LPR430AL 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 2/14 Doc ID 16574 Rev 1 LPR430AL Block diagram and pin description 1 Block diagram and pin description Figure 1. Block diagram 1.1 Pin description Figure 2. Pin connection Doc ID 16574 Rev 1 3/14 Block diagram and pin description LPR430AL 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 X NC NC NC 4xIN X NC 4xOUTX NC Vdd NC NC NC NC 4xOUTY NC 4xIN Y VCONT FILTVDD Vdd OUTY NC Vref NC HP Res GND ST SLEEP/PD Analog function X rate signal output voltage (not amplified) Internally not connected Internally not connected Internally not connected Input of 4x amplifier Internally not connected X rate signal output voltage (amplified) Internally not connected Power supply Internally not connected Internally not connected Internally not connected Internally not connected Y 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 Y 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 unconnected or connect to Vdd 0V supply voltage Self-test (see Table 6) Sleep mode / power-down mode (see Table 6) 4/14 Doc ID 16574 Rev 1 LPR430AL 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 25°C vs. temperature Non linearity Bandwidth (3) Test condition 4x OUT (amplified) OUT (not amplified) 4x OUT (amplified) OUT (not amplified) Delta from 25°C Min. Typ.(1) ±300 ±1200 3.33 0.83 0.07 1.5 1.5 0.05 ±1 140 250(4) 0.018 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. Doc ID 16574 Rev 1 5/14 Mechanical and electrical specifications LPR430AL 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 PD pin connected to Vdd Logic 0 level 0 PD pin connected to GND 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 µA VST VPD Power-down input Operating temperature range Top 1. Typical specifications are not guaranteed. b. The product is factory calibrated at 3 V 6/14 Doc ID 16574 Rev 1 LPR430AL 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 Doc ID 16574 Rev 1 7/14 Terminology LPR430AL 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 LPR430AL 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 LPR430AL 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). 8/14 Doc ID 16574 Rev 1 LPR430AL 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 Doc ID 16574 Rev 1 9/14 Application hints LPR430AL 5 Application hints Figure 3. LPR430AL electrical connections and external component 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 LPR430AL allows band limiting 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). 4xOUTX and 4xOUTY are, respectively, OUTX and OUTY 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 non-amplified output is used (OUTX/OUTY), it is recommended to set pin 5 and 16 to fixed reference voltage (Vref). The LPR430AL 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. 10/14 Doc ID 16574 Rev 1 LPR430AL 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®, 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 Doc ID 16574 Rev 1 11/14 Package information LPR430AL 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 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 12/14 Doc ID 16574 Rev 1 LPR430AL Revision history 7 Revision history Table 7. Date 29-Oct-2009 Document revision history Revision 1 Initial release Changes Doc ID 16574 Rev 1 13/14 LPR430AL Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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