Analog Devices Inc. ADXL312WACPZ Accelerometers

ADXL312 is a small, thin, low power, 3-axis accelerometer with high resolution (13bit) measurement up to ±12g. Digital output data is formatted as 16bit twos complement and is accessible through either a serial port interface (SPI) (3- or 4-wire) or I²C digital interface. It is ...ADXL312 is a small, thin, low power, 3-axis accelerometer with high resolution (13bit) measurement up to ±12g.

Digital output data is formatted as 16bit twos complement and is accessible through either a serial port interface (SPI) (3- or 4-wire) or I²C digital interface. It is well suited for car alarm or black box applications. It measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock.

Its high resolution (2.9mg/LSB) enables resolution of inclination changes of as little as 0.25°. A built-in FIFO facilitates using oversampling techniques to improve resolution to as little as 0.05° of inclination. Several special sensing functions are provided.

Activity and inactivity sensing detects the presence or absence of motion and whether the acceleration on any axis exceeds a user-set level. Typical applications are car alarm, hill start aid (HSA), electronic parking brake, data recorder (black box). Power consumption scales automatically with bandwidth Embedded FIFO technology minimizes host processor load Built-in motion detection functions for activity/inactivity monitoring Flexible interrupt modes mappable to either interrupt pin Measurement ranges selectable via serial command, bandwidth selectable via serial command Operating voltage range from 2 to 3.6V (TA=-40°C to +105°C, VS=VDD I/O=3.3V, acceleration=0g) Supply current is 170μA typ (data rate > 100Hz, TA=-40°C to 105°C, VS=VDD I/O=3.3V, acceleration=0g) Turn-on (wake-up) time is 1.4ms (TA=-40°C to +105°C, VS=VDD I/O=3.3V, acceleration=0g) 32-lead LFCSP package, qualified for automotive applications Temperature rating range from -40°C to +105°C