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 pri- marily 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 2.0 g and produces a pwm digital signal output. sensor is shipped with a duty cycle period of 10 milli- seconds (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 cycle hz, 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, (typ- ical 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/?. this device can be temperature compensated easily. the change in sensitivity over the temperature range ?0? to 125? is pre- dictable and follows the physical gas laws. the following equation can be used to predict the sensitivi- ty at any given temperature: s in x (t in ) 2.67 = s fin x (t fin ) 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 her- metic and are specified over the temperature range -40 c to 125 c. general description MXD202 (digital) features low cost, 2.0 g , dual axis accelerometer with digital outputs 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 information furnished by memsic is believed to be accurate and reliable. however, no responsibility is assumed by memsic for its use, nor for any infringe- ments 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. ?emsic, inc. 2000. 100 burtt road, andover, ma 01810 tel: 978.623.8188 ? fax: 978.623.9945 www.memsic.com MXD202 digital data sheet k 8/1/01 page 1 of 8 data sheet MXD202 ?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 0 g output 50% duty cycle 50,000 g 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 (v ref ) 2.50v block diagram of mx20xx
MXD202 specifications digital electrical characteristics notes 1 guarantee by measurements of initial offset and sensitivity. 2 alignment error is specified as the angle between the true and indicated axis of sensitivity. 3 cross-axis sensitivity is the algebraic sum of the alignment and the inherent sensitivity errors. 4 specification refers to the maximum change in parameter from its initial value at 25 c to its worst case value at tmin to tmax of the specified temperature range. 5 noise density (% duty cycle /hz) is the average noise at any frequency in the bandwidth of the device. 6 the voltage is required to ramp full scale before making a measurement. 7 note: frequency compensating circuit will achieve 160 hz operations. 8 defined as the output change from ambient to maximum temperature or minimum. output change expressed in % change of duty cycle. 9 for more details refer to application note (an-00mx-001). all min and max specifications are subject to change without notification. information furnished by memsic is believed to be accurate and reliable. however, no responsibility is assumed by memsic for its use, nor for any infringe- ments 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. page 2 of 8 data sheet memsic, inc. 2000. 100 burtt road, andover, ma 01810 tel: 978.623.8188 fax: 978.623.9945 www.memsic.com MXD202 digital data sheet k 8/1/01 MXD202 temperature changes 8 delta from 25 c per formula s in x (t in ) 2.67 = s fin x (t fin ) 2.67 sensor each axis measurement range 1 nonlinearity best fit straight alignment error 2 line sensitivity each axis output in duty cycle per g zero g bias level each axis 48 50 52 % duty cycle 0g offset vs. 2.0 mg/ c temperature 4 noise performance noise density 5 @ +25 c 0.010 0.011 % duty cycle % duty cycle / hz frequency response 3 db bandwidth 40 hz 3 db bandwidth 7 160 hz self test voltage delta at outputs continuous, @5v supply output rails with 5.0 v @2.7v supply failure 2.7 v x, y outputs digital signal of100hz rise/fall time 90 100 110 nsec temperature range operating range tout voltage 25 c 1.23 1.25 1.27 v temp sensor sensitivity 5 mv/ k v reference 9 25 c 2.4 2.5 2.6 v +/- 2.0 2 +/- 1.0 +/- 2.5 10 % duty cycle /g g % of fs degrees min typ max parameter conditions memsic MXD202 units 2.7 5.25 v 3.0 3.5 ma 4.0 4.5 ma 200 400 ms -40 125 c power supply operating voltage range specified performance quiescent supply current @ 5v quiescent supply current @ 2.7v turn-on time 6 measurements @ 25 c acceleration = 0g unless otherwise noted v dd , v da = 5.0v unless otherwise specified cross-axis sensitivity 3 x sensor to y sensor +/- 2 %
data sheet package characteristics package thetaja thetajc device weight to-100 150 c/w 25 c/w 0.04 oz lcc-8 110 c/w 22 c/w 0.02 oz page 3 of 8 memsic, inc. 2000. 100 burtt road, andover, ma 01810 tel: 978.623.8188 fax: 978.623.9945 www.memsic.com MXD202 digital data sheet k 8/1/01 MXD202 to-100 lcc-8 to-100 top view top view +g +g +g +g x x y y axes of sensitivity lcc-8 axes of sensitivity ordering guide model package style MXD202ac to-100 metal can MXD202al lcc-8 smd * 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. caution esd (electrostatic discharge) sensitive device. *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. absolute maximum ratings* symbol parameter rating units vdd supply voltage to ground potential -0.5 to 7.0 volts t stg storage temperature -65 to +150 deg c acceleration 50,000 g * lcc parts are shipped in tape and reel packaging.
pin description: to -100 package pin name description 1 vdd digital supply voltage 2 tout temperature 3 aouty acceleration signal 4 gnd ground 5 n/c no connection 6 vda analog supply voltage 7 aoutx acceleration signal 8 vref 2.50v reference voltage 9 sck serial clock 10 n/c no connection 1 2 3 6 7 8 9 10 5 4 page 4 of 8 data sheet pin function descriptions top-100 and lcc-8 pin description: lcc-8 package pin name description 1 tout temperature 2 aouty acceleration signal 3 gnd ground 4 vda analog supply voltage 5 aoutx acceleration signal 6 vref 2.50v reference voltage 7 sck serial clock 8 vdd digital supply voltage top view top view memsic, inc. 2000. 100 burtt road, andover, ma 01810 tel: 978.623.8188 fax: 978.623.9945 www.memsic.com MXD202 digital data sheet k 8/1/01 MXD202 optional external clock factory programmed per customer request * * *
page 5 of 8 data sheet 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. memsic, inc. 2000. 100 burtt road, andover, ma 01810 tel: 978.623.8188 fax: 978.623.9945 www.memsic.com MXD202 digital data sheet k 8/1/01 MXD202
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 infringe- ments 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. data sheet page 6 of 8 memsic, inc. 2000. 100 burtt road, andover, ma 01810 tel: 978.623.8188 fax: 978.623.9945 www.memsic.com MXD202 digital data sheet k 8/1/01 MXD202
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 infringe- ments 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. data sheet page 7 of 8 memsic, inc. 2000. 100 burtt road, andover, ma 01810 tel: 978.623.8188 fax: 978.623.9945 www.memsic.com MXD202 digital data sheet k 8/1/01 MXD202
information furnished by memsic is believed to be accurate and reliable. however, no responsibility is assumed by memsic for its use, nor for any infringe- ments 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. page 8 of 8 data sheet 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. printed circuit board layout and fabrication requirements memsic, inc. 2000. 100 burtt road, andover, ma 01810 tel: 978.623.8188 fax: 978.623.9945 www.memsic.com MXD202 digital data sheet k 8/1/01 MXD202
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