Low Cost 5 g Dual-Axis Accelerometer with SPI Interface Automotive Grade MXP7205VW VDA FEATURES TEMP Dual axis accelerometer fabricated on a single CMOS IC Monolithic design with mixed mode signal processing Control Reference Internal Temperature FM Oscillator Register Voltage Sensor Zero-g temperature stability better than 30mg from 40C to Vref CLK 105C TEMP CLK Sensitivity temperature compensation better that 3% from Coarse Fine Gain Heater Gain Adj. Adj. -40C to 105C Control 5g dynamic range, 800LSB/g sensitivity Low Pass Temp X axis A/D 29Hz bandwidth Comp. Filter On Demand Self Test CLK TEMP CLK CLK CLK SSB SPI >50,000 g shock survival rating SCK Coarse Fine Gain VDD Interface MOSI Gain Adj. Adj. 4.50V to 5.25V single supply operation MISO Small surface mount package, 5.5mm x 5.5mm x 2.7mm Low Pass Temp Y axis A/D Comp. Filter XZ or XY mounting Acceleration CLKTEMP CLK CLK CLK RoHS compliant Sensor GND AUTOMOTIVE APPLICATIONS MXP7205VW FUNCTIONAL BLOCK DIAGRAM Vehicle Stability Control Roll Over Detection Electronic Parking Break Hill Start Assist Headlight Leveling and Steering GENERAL DESCRIPTION The MXP7205VW 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 800LSB/g with 14bits operation mode and 50LSB/g with vibration) and static acceleration (e.g., gravity). 10bits operation mode. The design is based on heat convection and requires no The MXP7205VW provides an SPI interface. solid proof mass. This eliminates stiction, particle, and inherent resonant frequency problems associated with The typical noise floor is 0.6mg / Hz , allowing signals competitive devices and provides shock survivability to below 1mg to be resolved at 1Hz bandwidth. The inherent greater that 50,000g, leading to significantly lower failure 3dB roll off of the device is 29Hz providing immunity to rates and lower loss due to handling during assembly and at and attenuation of higher frequency vibrations present in customer field application. automotive applications. Due to the standard CMOS structure of the MXP7205VW, The MXP7205VW is packaged in a hermetically sealed additional circuitry can easily be incorporated into custom LCC surface mount package (5.5 mm x 5.5 mm x 2.7 mm versions for high volume applications. Contact MEMSICs height), and the package can be used for either XY and XZ local office for more information. sensing, its operation temperature is -40 C to +105 C. 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 MXP7205VW Rev.D Page 1 of 11 8/10/2012 MXP7205VW SPECIFICATIONS (Measurements 25 C, 14bits operation mode, Acceleration = 0 g unless otherwise noted V = V =5.0V unless otherwise specified) DD DA PARAMETER Conditions MIN TYP MAX UNITS Full scale ranges -5 5 g Nominal Sensitivity 14bits operation mode 800 LSB/g 10bits operation mode 50 LSB/g -3 0 +3 % Initial 25 C Sensitivity drift Initial -40 C to +105 C -3 +3 % Sensitivity drift Include Aging -4 0 +4 % -40 C to +105 C Cross Axis Sensitivity 2.0 % Non-Linearity (best straight line) FSR=10g 1.0 %FSR Zero g Output Offset 2 s complement output 0 LSB -60 0 +60 mg Initial 25 C Zero g Output Temperature Drift -30 +30 mg Initial -40 C to +105 C 1.0 mg/ C Zero g Output Temperature Drift Include Aging -60 0 +60 mg -40 C to +105 C Total Offset Drift Due to 80 mg -40 C to +105 C with 1 Temperature 2.5 C/min Temp Ramp (max-min) 40 mg -20 C to +80 C with 2.5 C/min Temp Ramp (max-min) 0 C to +60 C with 50 mg 2.5 C/min Temp Ramp (max-min) Selftest Signal X-axis +2.5 g Y/Z-axis -2.5 g Selftest Signal Tolerance -5 +5 % 25 C Selftest Signal Drift (0g input) -5 +5 % -40 C to +105 C -8 +8 % -40 C to +105 C, include aging Selftest Signal Rise/Fall Time 20 mS Frequency Response 26 29 32 Hz Phase Delay 0 to 1KHz 10 12 mS Recover Time From Overload Input 10g, 1mS shock 2 mS 10000g, 0.5mS half sine 10 mS shock Input Referred Noise Density 0.5 1.5 mg/sqrtHz -40 C to +105 C, within 29Hz 3.5 5.5 mg RMS No external filtering, 25 C RMS Output Noise No external filtering 11 mg RMS -40 C to +105 C 2 Power up time 200 300 mS Operation Power Supply Range 4.5 5.0 5.25 V Power consumption 5V 3.5 4.5 mA Operation Temperature Range -40 105 C 1 Note: : Requirements can be met by characterization of 3lots x 30 parts per lot, not 100% test in production. 2 : Output settled to within +/-17mg of the final value. MEMSIC MXP7205VW Rev.D Page 2 of 12 8/10/2012