ADXL212 Datasheet | Analog Devices

..net Precision ±2 g Dual Axis, PWM Output Accelerometer ADXL212 Features Dual axis accelerometer on a single IC chip 5 mm × 5 mm × 2 mm LCC package 5 mg resolution at 60 Hz Low power: 700 μA at VS = 5 V (typical) High zero g bias stability High sensitivity accuracy Pulse width modulated digital outputs X- and Y-axis aligned to within 0.1° (typical) Bandwidth adjustment with a single capacitor Single-supply operation 3500 g shock survival GENERAL DESCRIPTION The ADXL212 is a high precision, low power, plete dual axis accelerometer with signal conditioned, duty cycle modulated outputs, all on a single monolithic IC. The ADXL212 measures acceleration with a full-scale range of ±2 g (typical). The ADXL212 measures both dynamic acceleration (such as vibration) and static acceleration (such as gravity). The outputs are digital signals whose duty cycles (ratio of pulse width to period) are proportional to acceleration (12.5%/g) in each of the two sensitive axes. The duty cycle outputs can be directly measured by a microcontroller without an analog-todigital converter (ADC) or glue logic. The output period is adjustable from 0.5 ms to 10 ms via a single resistor (RSET). The typical noise floor is 500 μg/√Hz, allowing signals below 5 mg (0.3° of inclination) to be resolved in tilt sensing applications using narrow bandwidths (<60 Hz). The user selects the bandwidth of the accelerometer using Capacitors CX and CY at the XFILT and YFILT pins. Bandwidths of 0.5 Hz to 500 Hz can be selected to suit the application. The ADXL212 is available in a 5 mm × 5 mm × 2 mm, 8-lead hermetic LCC package. APPLICATIONS Automotive tilt alarms Vehicle dynamic control (VDC)/electronic stability program (ESP) systems Electronic chassis control Electronic braking Data projectors Navigation Platform stabilization/leveling Alarms and motion detectors High accuracy, 2-axis tilt sensing +VS VS FUNCTIONAL BLOCK DIAGRAM CY YFILT CDC OUTPUT AMP DEMOD OUTPUT AMP 32kΩ 32kΩ...