LPR403AL STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 14
Technical content
Datasheet sections
- 1 Block diagram and pin description
- 1.1 Pin description
- 2 Mechanical and electrical specifications
- 2.1 Mechanical characteristics
- 2.2 Electrical characteristics
- 3 Absolute maximum ratings
- 4 Terminology
- 4.1 Sensitivity
- 4.2 Zero-rate level
- 4.3 Self-test
- 4.4 High pass filter reset (HP)
- 4.5 Sleep mode, self test and power down
- 5 Application hints
- 5.2 Soldering information
- 6 Package information
- 7 Revision history
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
■ Image stabilization for DVC and DSC ■ Image stabilization for camera phones ■ Motion controlled user interface ■ GPS navigation systems
Description
The LPR403AL is a low-power dual-axis micro- machined 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). The LPR403AL has a full scale of ±30 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 LPR403AL 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
1 Block diagram and pin description
Figure 1. Block diagram
1.1 Pin description
Figure 2. Pin connection
Table 2. Pin description
1 OUT X X rate signal output voltage (not amplified)
2 NC Internally not connected
3 NC Internally not connected
4 NC Internally not connected
6 NC Internally not connected
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
15 NC Internally not connected
17 VCONT PLL filter connection pin #17
18 FILTVDD PLL filter connection pin #18
20 OUTY Y 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;
26 GND 0V supply voltage
27 ST Self-test (see Table 6)
28 SLEEP/PD Sleep mode / power-down mode (see Table 6)
2 Mechanical and electrical specifications
2.1 Mechanical characteristics
a. The product is factory calibrated at 3 V. T he operational power supply range is specified in Table 4. Table 3. Mechanical characteristics
- Typical specificat ions are not guaranteed.
- Sensitivity and zero-rate level are not ratiometric to supply voltage
- The product is capable of measuring angular rates extending from DC to the selected BW.
- Self test typical absolute value.
2.2 Electrical characteristics
Table 4. Electrical characteristics
- Typical specificat ions are not guaranteed.
3 Absolute maximum ratings
Table 5. Absolute maximum ratings
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 LPR403AL 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 LPR403AL 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
5 Application hints
Figure 3. LPR403AL electrical connections and external component values be placed as near as possible to the device (common design practice). buffered to ensure low output impedance. pin 16 to pin 20, respectively, when amplified outputs are used. and 16 to a fixed reference voltage (Vref). pins (as shown in Figure 3) to implement a low-pass filter.
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.
6 Package information
specifications, grade definitions and product status are available at: www.st.com. Figure 5. LGA-28: mechanical data and package dimensions
7 Revision history
Table 7. Document revision history 29-Oct-2009 1 Initial release.