Says ST gyroscope brings dead-reckoning to cars
The A3G4250D is a low-power 3-axis angular rate sensor able to provide unprecedented stability at zero rate level and sensitivity over temperature and time. It includes a sensing element and an IC interface capable of providing the measured angular rate to the external world through a standard SPI digital interface. An I2C-compatible interface is also available.
The sensing element is manufactured using a dedicated micro-machining process developed by STMicroelectronics to produce inertial sensors and actuators on silicon wafers.
The IC interface is manufactured using a CMOS process that allows a high level of integration to design a dedicated circuit which is trimmed to better match the sensing element characteristics.
The A3G4250D has a full scale of ±245 dps and is capable of measuring rates with a user-selectable bandwidth.
The A3G4250D is available in a plastic land grid array (LGA) package and can operate within a temperature range of -40 °C to +85 °C.
- Wide supply voltage: 2.4 V to 3.6 V
- ±245 dps full scale
- I2C/SPI digital output interface
- 16-bit rate value data output
- 8-bit temperature data output
- Two digital output lines (interrupt and data ready)
- Integrated low and high-pass filters with user-selectable bandwidth
- Ultra-stable over temperature and time
- Low-voltage-compatible IOs (1.8 V)
- Embedded power-down and sleep mode
- Embedded temperature sensor
- Embedded FIFO
- High shock survivability
- Extended operating temperature range (-40 °C to +85 °C)
- ECOPACK® RoHS and “Green” compliant
- AEC-Q100 qualification
STMicroelectronics has introduced its first 3-axis digital-output gyroscope that meets the industry-standard qualification for automotive integrated circuits (AEC-Q100).
The angular-rate sensor is designed for applications, including in-dash navigation, telematics and vehicle tolling systems.
In many cases dead-reckoning systems ar eused to compensate for loss of satellite signal with GPS, and so can be used for monitoring motion, distance travelled and altitude.
Gyroscopes which employ a single sensing structure for motion measurement along all three orthogonal axes can eliminate interference between the axes, thereby increasing measurement precision, coupled with improved output stability over time and temperature.
The A3G4250D gyroscope measures angular rates up to +/-250dps (degree per second). An on-chip IC interface converts the angular-motion data into a 16-bit digital bit stream that is transmitted with high reliability to a dedicated microcontroller chip through a standard SPI or I2C protocol.
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