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| Data Sheet MXD202 Page 1 of 8 MXD202 (DIGITAL) Low Cost, 2.0g, Dual Axis Accelerometer with Digital Outputs General Description The MXD202 is a very low cost dual-axis acceleration sensor on a monolithic IC. With no moving parts, the device is extremely reliable and is manufactured on a submicron CMOS process enabling small geometries and small die size, resulting in low overall cost and high functionality. The MXD202 is primarily designed for applications requiring high performance and where overall system cost is a driving factor in component selection. The MXD202 measures acceleration with a full-scale range of up to 2.0g and produces a PWM digital signal output. Sensor is shipped with a duty cycle period of 10 milliSeconds (100 Hz). Special order sensors are available with a duty cycle period of 2.5 milli-Seconds (400 Hz). Typical noise floor is .01% Duty CycleHz, allowing signals below 1.0 milli-g to be resolved. Frequency response extends to 40 Hz. The frequency response can be extended to 160 Hz with the implementation of a simple external circuit. The MXD202 is a dc accelerometer with the capability to measure both ac acceleration, (typical of vibration) or dc accelerations, (such as inertial force or constant, gravity-induced accelerations). The MXD202 offers digital output signals which duty cycles (ratio of pulse width to period) are proportional to the acceleration in each of the axes of sensitivity. The outputs can be measured directly with a microprocessor counter, eliminating the need for A/D converter or glue logic. The output duty cycle is programmable over a wide range of sensitivity. MXD202 offers a calibrated temperature sensor output with a positive temperature coefficient of 5.0 mV/C. This device can be temperature compensated easily. The change in sensitivity over the temperature range -40C to 125C is predictable and follows the physical gas laws. The following equation can be used to predict the sensitivity at any given temperature: SIN X (TIN)2.67 = SFIN X (TFIN)2.67 (Temperature in K) See Application Note (AN-00MX-001). The MXD202 is available in a metal can (TO-100) or a surface mount (LCC); both are hermetic and are specified over the temperature range -40C to 125C. Features * Dual axis acceleration outputs * Digital outputs * 1.0 mg Resolution in 1Hz bandwidth * 40 Hz Bandwidth expandable to 160 Hz * Quiescent Supply Voltage: 3.5 mA * 0g output 50% duty cycle * 50,000g shock survival * 2.70V to 5.25V Single Supply * On-chip mixed signal processing * Continuous sensors self test * Temperature sensor output (Tout) 5mV/K * Packaged in 8 pin LCC SMD or 10 pin TO-100 THRU-HOLE * Hermetically sealed packaging * Reference voltage (VREF) 2.50V Applications * Automotive - Vehicle Security/Active Suspension/ABS/HED Angle Control * Security - Gas Line/Elevator/Fatigue Sensing * Office Automation Equipment - Computer Peripherals/Disk Drives/PDA's/Mouse Smart Pens/Cell Phones/Printer Head Acceleration Sensor * Gaming - Joystick/RF Interface/Menu Selection * White Goods - Spin Control/Cooktop Vibration Block Diagram of MX20XX Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implications or otherwise under any patent or patent rights of MEMSIC. Technical information. Subject to change without notice. MXD202 DIGITAL Data Sheet K 8/1/01 (R)MEMSIC, Inc. 2000. 100 Burtt Road, Andover, MA 01810 Tel: 978.623.8188 * Fax: 978.623.9945 www.memsic.com Data Sheet MXD202 Page 2 of 8 MXD202 SPECIFICATIONS Digital Electrical Characteristics Measurements @ 25C Acceleration = 0g unless otherwise noted VDD, VDA = 5.0V unless otherwise specified Parameter SENSOR Measurement Range1 Nonlinearity Alignment Error2 SENSITIVITY Output in Duty Cycle per g Temperature Changes8 Cross-Axis Sensitivity3 ZERO g BIAS LEVEL 0g Offset vs. Temperature4 NOISE PERFORMANCE Noise Density 5 % Duty Cycle FREQUENCY RESPONSE 3 dB Bandwidth 3 dB Bandwidth7 Tout Voltage Temp sensor sensitivity V REFERENCE 9 SELF TEST Voltage Delta at outputs @5V Supply @2.7V Supply X, Y OUTPUTS Rise/Fall Time POWER SUPPLY Operating Voltage Range Specified Performance Quiescent Supply Current @ 5V Quiescent Supply Current @ 2.7V Turn-On Time6 TEMPERATURE RANGE Operating Range Conditions Each axis MEMSIC MXD202 Min Typ Max +/- 2.0 Units NOTES 1 Guarantee by measurements of initial offset and sensitivity. 2 Best Fit Straight Line Each axis 2 +/- 1.0 10 +/- 2.5 g % of FS degrees % Duty Cycle /g Alignment error is specified as the angle between the true and indicated axis of sensitivity. Cross-axis sensitivity is the algebraic sum of the alignment and the inherent sensitivity errors. Specification refers to the maximum change in parameter from its initial value at 25C to its worst case value at Tmin to Tmax of the specified temperature range. Noise density (% Duty Cycle/Hz) is the average noise at any frequency in the bandwidth of the device. The voltage is required to ramp full scale before making a measurement. 3 4 Delta from 25C per formula SIN X (TIN)2.67 = SFIN X (TFIN)2.67 X sensor to Y sensor Each axis 48 +/- 2 50 2.0 52 % % Duty Cycle mg/C 5 6 7 Note: Frequency compensating circuit will achieve 160 Hz operations. Defined as the output change from ambient to maximum temperature or minimum. Output change expressed in % change of duty cycle. For more details refer to Application Note (AN-00MX-001). All min and max specifications are subject to change without notification. @ +25C 0.010 0.011 % Duty Cycle /Hz 8 40 160 25C 25C Continuous, Output rails with failure Digital signal of100Hz 90 100 110 1.23 2.4 1.25 2.5 1.27 5 2.6 Hz Hz V mV/K V 9 5.0 2.7 V V nsec 2.7 3.0 4.0 200 -40 5.25 3.5 4.5 400 125 V mA mA ms C Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implications or otherwise under any patent or patent rights of MEMSIC. Technical information. Subject to change without notice. MXD202 DIGITAL Data Sheet K 8/1/01 (R)MEMSIC, Inc. 2000. 100 Burtt Road, Andover, MA 01810 Tel: 978.623.8188 * Fax: 978.623.9945 www.memsic.com Data Sheet MXD202 Page 3 of 8 ABSOLUTE MAXIMUM RATINGS* Symbol VDD TSTG Parameter Supply Voltage to Ground Potential Storage Temperature Acceleration Rating -0.5 to 7.0 -65 to +150 50,000 Units Volts Deg C g TO-100 *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only; the functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PACKAGE CHARACTERISTICS Package TO-100 LCC-8 ThetaJA 150C/W 110C/W ThetaJC 25C/W 22C/W Device Weight 0.04 oz 0.02 oz TOP VIEW Y +g X +g ORDERING GUIDE Model MXD202AC MXD202AL Package Style TO-100 Metal Can LCC-8 SMD * LCC-8 TO-100 Axes of Sensitivity * LCC parts are shipped in tape and reel packaging. NOTE Drops onto hard surfaces can cause shocks of greater than 50,000g and exceed the absolute maximum rating of the device. Care should be exercised in handling to avoid damage. Y +g CAUTION ESD (electrostatic discharge) sensitive device. TOP VIEW X +g LCC-8 Axes of Sensitivity MXD202 DIGITAL Data Sheet K 8/1/01 (R)MEMSIC, Inc. 2000. 100 Burtt Road, Andover, MA 01810 Tel: 978.623.8188 * Fax: 978.623.9945 www.memsic.com Data Sheet MXD202 Page 4 of 8 Pin Function Descriptions TOP-100 and LCC-8 PIN DESCRIPTION: TO -100 Package Pin 1 2 3 4 5 6 7 8 9 10 Name VDD TOUT AOUTY GND n/c VDA AOUTX VREF SCK n/c Description Digital Supply Voltage Temperature Acceleration Signal Ground no connection Analog Supply Voltage Acceleration Signal 2.50V Reference Voltage Serial Clock no connection 1 2 3 4 10 9 8 7 * 5 6 Top View PIN DESCRIPTION: LCC-8 Package Pin 1 2 3 4 5 6 7 8 Name TOUT AOUTY GND VDA AOUTX VREF SCK VDD Description Temperature Acceleration Signal Ground Analog Supply Voltage Acceleration Signal 2.50V Reference Voltage Serial Clock Digital Supply Voltage * * Optional external clock factory programmed per customer request Top View MXD202 DIGITAL Data Sheet K 8/1/01 (R)MEMSIC, Inc. 2000. 100 Burtt Road, Andover, MA 01810 Tel: 978.623.8188 * Fax: 978.623.9945 www.memsic.com Data Sheet MXD202 Page 5 of 8 Pin Definition VDD - This is the digital power supply input for the MX20XX. The DC voltage should be between 2.70 and 5.25 volts. VDA - This is the analog power supply input for the MX20XX. VDA should always be connected to VDD. GND - This is the ground pin for the MX20XX. AOUTX - This pin is the output of the x-acceleration sensor. AOUTY - This pin is the output of the y-acceleration sensor. TOUT - This pin is the buffered output of the temperature sensor. The voltage at TOUT is an indication of the die temperature. This voltage can be measured and used to compensate out the temperature dependence of accelerometer sensitivity. SCK - Standard product is delivered with an Internal Clock option. Ground this pin when operating with the Internal Clock. The External Clock must be ordered special from the factory. VREF - A reference voltage is output from this pin. MXD202 DIGITAL Data Sheet K 8/1/01 (R)MEMSIC, Inc. 2000. 100 Burtt Road, Andover, MA 01810 Tel: 978.623.8188 * Fax: 978.623.9945 www.memsic.com Data Sheet MXD202 Page 6 of 8 Package Outline LCC-8 mm (in) Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implications or otherwise under any patent or patent rights of MEMSIC. Preliminary technical information. Subject to change without notice. MXD202 DIGITAL Data Sheet K 8/1/01 (R)MEMSIC, Inc. 2000. 100 Burtt Road, Andover, MA 01810 Tel: 978.623.8188 * Fax: 978.623.9945 www.memsic.com Data Sheet MXD202 Page 7 of 8 Package Outline TO-100 mm (in) Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implications or otherwise under any patent or patent rights of MEMSIC. Preliminary technical information. Subject to change without notice. MXD202 DIGITAL Data Sheet K 8/1/01 (R)MEMSIC, Inc. 2000. 100 Burtt Road, Andover, MA 01810 Tel: 978.623.8188 * Fax: 978.623.9945 www.memsic.com Data Sheet MXD202 Page 8 of 8 Printed Circuit Board Layout and Fabrication Requirements NOTES 1. Use robust low inductance ground wiring 2. Liberal use of ceramic bypass capacitors 3. The Capacitors should be located as close as possible to the device supply pins (VDA, VDD). 4. The capacitor lead length should be as short as possible. Surface mount capacitors are preferred. Information furnished by MEMSIC is believed to be accurate and reliable. However, no responsibility is assumed by MEMSIC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implications or otherwise under any patent or patent rights of MEMSIC. Technical information. Subject to change without notice. MXD202 DIGITAL Data Sheet K 8/1/01 (R)MEMSIC, Inc. 2000. 100 Burtt Road, Andover, MA 01810 Tel: 978.623.8188 * Fax: 978.623.9945 www.memsic.com |
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