Ultra Low Noise, Offset Drift 1 g Dual Axis Accelerometer with Analog Outputs MXA2500E FEATURES Sck Internal Temperature Better than 1 mg resolution 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 Self Test 50,000 g shock survival rating Control 17 Hz bandwidth expandable to >160 Hz 3V to 5.25V single supply continuous operation Low Pass X axis A OUTX Filter Small (5mm x 5mm x 2mm) surface mount package Continuous self test Factory Adjust Custom programmable specifications Offset & Gain Independent axis programmability (special order) Low Pass Y axis A OUTY Filter 2-AXIS APPLICATIONS SENSOR Automotive Vehicle Security/Active Suspension/ABS V Gnd V DD DA Headlight Angle Control/Tilt Sensing Security Gas Line/Elevator/Fatigue Sensing Office Equipment Computer Peripherals/PDAs/ MXA2500E FUNCTIONAL BLOCK DIAGRAM Cell Phones Gaming Joystick/RF Interface/Menu Selection/Tilt Sensing White Goods Spin/Vibration Control GENERAL DESCRIPTION The MXA2500E is an ultra low noise and low cost, dual The MXA2500E provides two absolute analog outputs. The typical noise floor is 0.2 mg/ Hz allowing signals axis accelerometer fabricated on a standard, submicron below 1 mg to be resolved at 1 Hz bandwidth. The 3dB CMOS process. It is a complete sensing system with on- rolloff of the device occurs at 17 Hz but is expandable to chip mixed mode signal processing. The MXA2500E >160 Hz (ref. Application Note AN-00MX-003). The measures acceleration with a full-scale range of 1 g and a MXA2500E is available in a LCC surface mount package sensitivity of 500mV/g 5V at 25C. It can measure both (5 mm x 5 mm x 2 mm). It is hermetically sealed and is dynamic acceleration (e.g., vibration) and static operational over a -40C to +105C temperature range. It acceleration (e.g., gravity). The MXA2500E design is also contains an on-chip temperature sensor and a bandgap based on heat convection and requires no solid proof mass. voltage reference. This eliminates stiction and particle problems associated with competitive devices and provides shock survival of Due to the standard CMOS structure of the MXA2500E, 50,000 g, leading to significantly lower failure rates and additional circuitry can easily be incorporated into custom lower loss due to handling during assembly. versions for high volume applications. Contact the factory for more information. 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 MXA2500E Rev G Page 1 of 9 2/26/2007 MXA2500E SPECIFICATIONS (Measurements 25C, Acceleration = 0 g unless otherwise noted V , V = 5.0V DD DA unless otherwise specified) MXA2500E Parameter Conditions Min Typ Max Units SENSOR INPUT Each Axis 1 Measurement Range 1.0 g Nonlinearity Best fit straight line 0.5 1.0 % of FS 2 Alignment Error 1.0 degree 3 Transverse Sensitivity 2.0 % SENSITIVITY Each Axis Sensitivity, Analog Outputs at pins 6 A and A 475 500 525 OUTX OUTY mV/g 4 Change over Temperature (uncompensated) +120 % from 25C, at 40C from 25C, at +105C -55 % 4 Change over Temperature (compensated) from 25C, 40C to +105C <3.0 % ZERO g BIAS LEVEL Each Axis 6 0 g Offset -0.1 0.00 +0.1 g 6 0 g Voltage 1.20 1.25 1.30 V 0 g Offset over Temperature from 25C 0.4 mg/C from 25C, based on 500mV/g 0.2 mV/C NOISE PERFORMANCE mg/ Hz Noise Density, rms Without frequency compensation 0.2 0.4 FREQUENCY RESPONSE 3dB Bandwidth - uncompensated 17 Hz 5 3dB Bandwidth - compensated >160 Hz TEMPERATURE OUTPUT T Voltage 1.15 1.25 1.35 V out Sensitivity 4.6 5.0 5.4 mV/C VOLTAGE REFERENCE OUTPUT V output 3V-5.25V supply 2.4 2.5 2.65 V Ref Change over Temperature 0.1 mV/C Current Drive Capability Source 100 A SELF TEST Continuous Voltage at A , A under 5.0V Supply, output rails to OUTX OUTY Failure supply voltage 5.0 V Continuous Voltage at A , A under 3.0V Supply, output rails to OUTX OUTY Failure supply voltage 3.0 V A and A OUTPUTS OUTX OUTY Normal Output Range 5.0V Supply 0.1 4.9 V 3.0V Supply 0.1 2.9 V Current Source or sink, 3.0V-5.25V supply 100 A 7 Turn-On Time 5.0V Supply 160 mS 3.0V Supply 300 mS POWER SUPPLY Operating Voltage Range 3.0 5.25 V Supply Current 5.0V 2.7 3.3 4.1 mA 6 Supply Current 3.0V 3.2 4.0 4.8 mA TEMPERATURE RANGE Operating Range -40 +105 C NOTES 6 1 The device operates over a 3.0V to 5.25V supply range. Please note that Guaranteed by measurement of initial offset and sensitivity. sensitivity and zero g bias level will be slightly different at 3.0V operation. 2 Alignment error is specified as the angle between the true and indicated For devices to be operated at 3.0V in production, they can be trimmed at the axis of sensitivity. factory specifically for this lower supply voltage operation, in which case the 3 Transverse sensitivity is the algebraic sum of the alignment and the sensitivity and zero g bias level specifications on this page will be met. inherent sensitivity errors. 4 Please contact the factory for specially trimmed devices for low supply The sensitivity change over temperature for thermal accelerometers is based voltage operation. on variations in heat transfer that are governed by the laws of physics and it is 7 Output settled to within 17mg. highly consistent from device to device. Please refer to the section in this data sheet titled Compensation for the Change of Sensitivity over Temperature for more information. 5 External circuitry is required to extend the 3dB bandwidth. (ref. Application Note: AN-00MX-003). MEMSIC MXA2500E Rev G Page 2 of 8 2/26/2007