ADXL210E Datasheet | Analog Devices

a Features 2-Axis Acceleration Sensor on a Single IC Chip 5 mm ؋ 5 mm ؋ 2 mm Ultrasmall Chip Scale Package 2 mg Resolution at 60 Hz Low Power < 0.6 m A Direct Interface to Low-Cost Microcontrollers via Duty Cycle Output BW Adjustment with a Single Capacitor 3 V to 5.25 V Single-Supply Operation .. 1000 g Shock Survival APPLICATIONS 2-Axis Tilt Sensing with Faster Response than Electrolytic, Mercury, or Thermal Sensors puter Peripherals Information Appliances Alarms and Motion Detectors Disk Drives Vehicle Security Low-Cost ؎10 g Dual-Axis Accelerometer with Duty Cycle ADXL210E FUNCTIONAL BLOCK DIAGRAM 3V TO 5.25V CX VDD X SENSOR DEMOD CDC OSCILLATOR RFILT 32k⍀ ANALOG TO DUTY CYCLE (ADC) YOUT YFILT CY T2 RSET XFILT SELF-TEST XOUT RFILT 32k⍀ DEMOD Y SENSOR C O U N ␮P T E R T2 T1 A(g) = (T1/T2 - 0.5)/4% 0g = 50% DUTY CYCLE T2 = RSET/125M⍀ GENERAL DESCRIPTION The ADXL210E is a low-cost, low-power, plete 2-axis accelerometer with a digital output, all on a single monolithic IC. It is an improved version of the ADXL210AQC/JQC. The ADXL210E will measure accelerations with a full-scale range of ± 10 g. The ADXL210E can measure both dynamic acceleration (e.g., vibration) and static acceleration (e.g., gravity). The outputs are analog voltage or digital signals whose duty cycles (ratio of pulsewidth to period) are proportional to acceleration. The duty cycle outputs can be directly measured by a microprocessor counter without an A/D converter or glue logic. The duty cycle period is adjustable from 0.5 ms to 10 ms via a single resistor (RSET). The typical noise floor is 200 ␮g√Hz, allowing signals below 2 mg (at 60 Hz bandwidth) to be resolved. The bandwidth of the accelerometer is set with capacitors CX and CY at the XFILT and YFILT pins. An analog output can be reconstructed by filtering the duty cycle output. The ADXL210E is available in a 5 mm ϫ 5 mm ϫ 2 mm 8-lead hermetic LCC package. REV. 0 Information furnished by Analog...