Improved, Ultra Low Noise 1.7 g Dual Axis Accelerometer with Digital Outputs MXD2020G/H MXD2020M/N FEATURES Sck Internal Temperature Resolution better than 1 mg T OUT Oscillator Sensor (optional) Dual axis accelerometer fabricated on a monolithic CMOS IC RoHS compliant Voltage V REF Reference CLK On chip mixed mode signal processing No moving parts Continous Heater 50,000 g shock survival rating Self Test Control 17 Hz bandwidth expandable to >160 Hz 3.0V to 5.25V single supply continuous operation Low Pass X axis D OUTX Filter Continuous self test Independent axis programmability (special order) Factory Adjust Ultra low initial Zero-g Offset Offset & Gain APPLICATIONS Low Pass Y axis D Filter OUTY Automotive Vehicle Security/Vehicle stability control/ 2-AXIS SENSOR Headlight Angle Control/Tilt Sensing Security Gas Line/Elevator/Fatigue Sensing V Gnd V DD DA Information Appliances Computer Peripherals/PDAs/Cell Phones MXD2020G/H/M/N FUNCTIONAL BLOCK DIAGRAM Gaming Joystick/RF Interface/Menu Selection/Tilt Sensing GPS electronic Compass tilt Correction Consumer LCD projectors, pedometers, blood pressure Monitor, digital cameras GENERAL DESCRIPTION The MXD2020G/H/M/N provides two digital outputs that The MXD2020G/H/M/N is a low cost, dual axis are set to 50% duty cycle at zero g acceleration. The accelerometer fabricated on a standard, submicron CMOS outputs are digital with duty cycles (ratio of pulse width to process. It is a complete sensing system with on-chip period) that are proportional to acceleration. The duty mixed mode signal processing. The MXD2020G/H/M/N cycle outputs can be directly interfaced to a micro- measures acceleration with a full-scale range of 1.7 g and processor. a sensitivity of 20%/g 5V at 25C. It can measure both dynamic acceleration (e.g. vibration) and static acceleration The typical noise floor is 0.2 mg/ Hz allowing signals (e.g. gravity). below 1 mg to be resolved at 1 Hz bandwidth. The The MXD2020G/H/M/N design is based on heat MXD2020G/H/M/N is packaged in a hermetically sealed convection and requires no solid proof mass. This LCC surface mount package (5 mm x 5 mm x 2 mm height) eliminates stiction and particle problems associated with and is operational over a -40C to 105C(M/N) and 0C to competitive devices and provides shock survival of 50,000 70C(G/H) temperature range. g, leading to significantly lower failure rate and lower loss due to handling during assembly. Information furnished by MEMSIC is believed to be accurate and reliable. MEMSIC, Inc. However, no responsibility is assumed by MEMSIC for its use, nor for any 800 Turnpike St., Suite 202, North Andover, MA01845, USA infringements of patents or other rights of third parties which may result from Tel: +1 978 738 0900 Fax: +1 978 738 0196 its use. No license is granted by implication or otherwise under any patent or www.memsic.com patent rights of MEMSIC. MEMSIC MXD2020G/H/M/N Rev.G Page 1 of 7 2/26/2007 MXD2020G/H/M/N SPECIFICATIONS (Measurements 25C, Acceleration = 0 g unless otherwise noted V , V = 5.0V unless DD DA otherwise specified) MXD2020G/H MXD2020M/N Parameter Conditions Min Typ Max Min Typ Max Units SENSOR INPUT Each Axis 1 Measurement Range 1.7 1.7 g Nonlinearity Best fit straight line 0.5 1.0 0.5 1.0 % of FS 2 Alignment Error X Sensor to Y Sensor 1.0 1.0 degrees 3 Transverse Sensitivity % 2.0 2.0 SENSITIVITY Each Axis Sensitivity, Digital Outputs at 19 20 21 19 20 21 % duty pins cycle/g 4 D and D Change OUTX OUTY over Temperature -10 +8 -25 +8 % ZERO g BIAS LEVEL Each Axis 4 0 g Offset -0.1 0.0 +0.1 -0.1 0.0 +0.1 g 4 0 g Duty Cycle 48 50 52 48 50 52 % duty cycle 0 g Offset over Temperature from 25C 1.5 1.5 mg/C Based on 20%/g 0.03 0.03 %/C NOISE PERFORMANCE mg/ Hz Noise Density, rms 0.2 0.4 0.2 0.4 FREQUENCY RESPONSE 3dB Bandwidth 15 17 19 15 17 19 Hz TEMPERATURE OUTPUT T Voltage 1.15 1.25 1.35 1.15 1.25 1.35 V out Sensitivity 4.6 5.0 5.4 4.6 5.0 5.4 mV/K VOLTAGE REFERENCE OUTPUT Voutput 3.0V-5.25V supply2.4 2.5 2.65 2.4 2.5 2.65 V Ref Change over Temperature 0.1 0.1 mV/C Current Drive Capability Source 100 100 A SELF TEST Continuous Voltage at D , 5.0V Supply, output OUTX D under Failure rails to 5.0 5.0 V OUTY supply voltage Continuous Voltage at D , 3.0V Supply, output 3.0 3.0 OUTX D under Failure rails to V OUTY supply voltage D and DOUTPUTS OUTX OUTY Normal Output Range Output High 4.8 4.8 V Output Low 0.2 0.2 V Output Frequency MXD2020G/M 95 100 105 95 100 105 Hz MXD2020H/N 380 400 420 380 400 420 Hz Current Source or sink, 100 100 A 3.0V-5.25V supply Rise/Fall Time 3.0 to 5.25V supply 90 100 110 90 100 110 nS 5 Turn-On Time 5.0V Supply 160 160 mS 3.0V Supply 300 300 mS POWER SUPPLY Operating Voltage Range 3.0 5.25 3.0 5.25 V Supply Current 5.0V 2.7 3.8 4.4 2.7 3.8 4.4 mA Supply Current 3.0V 3.2 4.7 5.4 3.2 4.7 5.4 mA TEMPERATURE RANGE Operating Range 0 +70 -40 +105 C 4 The device operates over a 3.0V to 5.25V supply range. Please note that sensitivity NOTES and zero g bias level will be slightly different at 3.0V operation. For devices to be 1 Guaranteed by measurement of initial offset and sensitivity. operated at 3.0V in production, they can be trimmed at the factory specifically for 2 Alignment error is specified as the angle between the true and indicated axis of this lower supply voltage operation, in which case the sensitivity and zero g bias sensitivity. level specifications on this page will be met. Please contact the factory for specially 3 Transverse sensitivity is the algebraic sum of the alignment and the inherent trimmed devices for low supply voltage operation. sensitivity errors. 5 Output settled to within 17mg. MEMSIC MXD2020G/M/N/H Rev.G Page 2 of 7 2/26/2007