Improved Low Cost 5 g Dual-Axis Accelerometer with Ratiometric Analog Outputs MXR7305VF FEATURES z Dual axis accelerometer fabricated on a single CMOS IC z Monolithic design with mixed mode signal processing z RoHS compliant z On-chip sensitivity compensation for temperature variations z On Demand Self Test z 5g dynamic range, 250mV/g sensitivity z Independent axis programmability (special order) z Resolution better than 1mg z Zero-g Output Temperature drift, better than 80mg over 40~95degC range z 27Hz bandwidth z >50,000 g shock survival rating z 4.50V to 5.25V single supply operation z Small surface mount package, 5mm x 5mm x 2mm z Improved thermal gradient performance MXR7305V FUNCTIONAL BLOCK DIAGRAM APPLICATION Automotive Roll over sensing, VSC/EPB application GENERAL DESCRIPTION The MXR7305VF is a low cost, dual axis accelerometer Memsics accelerometer technology allows for designs built on a standard, submicron CMOS process. It measures from 1 g to 70 g with custom versions available above acceleration with a full-scale range of 5g and a sensitivity 70 g. It can measure both dynamic acceleration (e.g., of 250mV/g. vibration) and static acceleration (e.g., gravity). The MXR7305VF provides a g-proportional ratiometric The design is based on heat convection and requires no analog output above/below the zero-g point at 50% of the solid proof mass. This eliminates stiction and particle supply voltage. problems associated with competitive devices and provide (Ref. other MEMSIC data sheets for absolute analog or shock survival greater than 50,000 g, leading to digital outputs). significantly lower failure rates and lower loss due to handling during assembly and at customer field application. The typical noise floor is 0.6mg / Hz , allowing signals Due to the standard CMOS structure of the MXR7305V, below 1mg to be resolved at 1Hz bandwidth. The 3dB roll- additional circuitry can easily be incorporated into custom off of the device occurs at 27Hz. versions for high volume applications. Contact Memsics The MXR7305V is available in a low profile LCC surface local office for more information. mount package (5mm x 5mm 2mm). It is hermetically sealed and operational over a -40C to +95C temperature range. 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 One Technology Drive, Suite 325, Andover, MA01810, 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 MXR7305V Rev.A Page 1 of 6 6/18/2009 MXR7305VF SPECIFICATIONS (Measurements 25C, Acceleration = 0 g unless otherwise noted V = 5.0V DD unless otherwise specified) MXR7305V Parameter Conditions Min Typ Max Units SENSOR INPUT Each Axis 1 Measurement Range g 5.0 No linearity Best fit straight line 0.5 1.0 % of FS 1g input range, least squares fit 20 mg 2 Alignment Error 0.2 degrees 3 Transverse Sensitivity 0.5 2.0 % SENSITIVITY Each Axis Sensitivity, Analog Outputs at pins 4 Xout and Yout 5.0V supply 235 250 265 mV/g Sensitivity Ratiometricity 5V+/-5% 1.0 2.0 % 6 Change over Temperature -6 +3 % from 25C 40C to +95C nd 6 Change over Temperature with 2 Temp Comp -3 +3 % Change over Temperature with aging -6 +4 % nd Change over Temperature with 2 Temp Comp and -4 +4 % 6,8 aging ZERO g BIAS LEVEL Each Axis 0 g Offset -0.20 0.00 +0.20 g 0 g Voltage 2.45 2.5 2.55 V 0 g Offset Ratiometricity 5V+/-5% 1.0 % 0 g Offset over Temperature -80 80 mg from 25C, based on 250mV/g nd With 2 Temp Comp -40 40 mg 6, 0g Offset over Temp with aging -120 120 mg from 25C, based on 250mV/g nd With 2 Temp Comp -80 80 mg 6,7 0g Offset over Temp max-min from -20C to +80C 0 60 mg max-min from 0C to 60C 0 50 mg NOISE PERFORMANCE 40C to +95C Noise Density, rms 0.6 1.5 mg/ Hz FREQUENCY RESPONSE 3dB Bandwidth 24 27 30 Hz Phase delay at 5Hz -18 deg SELF TEST Delta Output changes at Xout, Yout -650 -830 -1000 mV at 25C, 0g input -700 -850 -1050 mV at 25C, 1g input -600 -900 -1100 mV at 25C, -1g input -600 -1100 mV -40C~95C, 0g input -500 -1500 mV -40C~95C, 1g input -600 -1600 mV -40C~95C, -1g input Selftest Input Voltage High 4.0 V Low 1.0 V Selftest Response Time 20 25 30 mS Self Test Pin Pull-Down Resistor (Internal) 50 Kohms Xout and Yout OUTPUTS Normal Output Range (Guaranteed symmetric clipping) 0.5 4.5 V Current Source or sink, 4.5V-5.25V 100 A supply Resistance 100 ohm Capacitance 100 pF Turn-On Time 5.0V Supply 80 200 mS POWER SUPPLY Operating Voltage Range 4.5 5.0 5.25 V 5 Supply Current 5.0V RMS 3.2 4.1 5.0 mA TEMPERATURE RANGE Operating Range -40 +95 C PRESSURE RANGE Operating Range 40 300 KPa. MEMSIC MXR7305VF Rev.A Page 2 of 6 6/18/2009