Analog Devices Inc. ADXL312 3-Axis Accelerometer
Analog Device ADXL312 3-axis accelerometer is designed as a small, low-power, 3-axis accelerometer with a high 13-bit resolution measurement of up to ±12g. The device formats digital output data as a 16-bit two's complement. The digital output data is accessible through either a 3- or 4-wire serial port interface (SPI) or an I2C digital interface.
The device measures the static acceleration of gravity in tilt-sensing applications. The device also measures dynamic acceleration resulting from motion or shock. ADXL312’s high resolution of 2.9mg/LSB allows resolution of inclination changes of as little as 0.25°.
The ADXL312 accelerometer's embedded FIFO technology facilitates oversampling techniques to improve resolution to as little as 0.05° of inclination.
The ADXL312 accelerometer also offers special sensing functions. ADXL312’s activity and inactivity sensing detect the presence or absence of motion. The activity and inactivity sensing also detect if the acceleration on any axis exceeds a user-set level. Low-power modes allow intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation.
Qualified for automotive applications and operating across a −40 to +105°C temperature range, the ADXL312 3-axis accelerometer is well-suited for car alarm and black-box applications.
Features
- Ultra-low power: as low as 57μA in measurement mode and 0.1μA in standby mode at VS = 3.3V (typical)
- Power consumption scales automatically with bandwidth
- User-selectable resolution
- Fixed 10-bit resolution
- Full resolution, where resolution increases with g range, up to 13-bit resolution at ±12g (maintaining 2.9 mg/LSB scale factor in all g ranges)
- Embedded FIFO technology minimizes host processor load
- Built-in motion detection functions for activity/inactivity monitoring
- Supply and I/O voltage range: 2V to 3.6V
- SPI (3- and 4-wire) and I2C digital interfaces
- Flexible interrupt modes mappable to either interrupt pin
- Measurement ranges selectable via serial command
- Bandwidth selectable via serial command
- Wide temperature range (−40 to +105°C)
- Wide temperature range (−40 to +105°C)
- 10,000g shock survival
- Pb free/RoHS compliant
- Small and thin: 5mm × 5mm × 1.45mm LFCSP package
- Qualified for automotive applications
Applications
- Car alarm
- Hill-start aid (HSA)
- Electronic parking brake
- Data recorder (black box)
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