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ADXL212AEZ产品简介:
ICGOO电子元器件商城为您提供ADXL212AEZ由Analog设计生产,在icgoo商城现货销售,并且可以通过原厂、代理商等渠道进行代购。 ADXL212AEZ价格参考¥166.31-¥199.37。AnalogADXL212AEZ封装/规格:运动传感器 - 加速计, Accelerometer X, Y Axis ±2g 500Hz 8-LCC (5x5)。您可以下载ADXL212AEZ参考资料、Datasheet数据手册功能说明书,资料中有ADXL212AEZ 详细功能的应用电路图电压和使用方法及教程。
参数 | 数值 |
产品目录 | |
描述 | IC ACCELEROMETER DUAL 8LCC加速计 Prec +/-2g Dual-Axis Low Power |
产品分类 | 加速计运动与定位传感器 |
品牌 | Analog Devices |
产品手册 | |
产品图片 | |
rohs | RoHS 合规性豁免无铅 / 符合限制有害物质指令(RoHS)规范要求 |
产品系列 | 加速计,Analog Devices ADXL212AEZ- |
数据手册 | |
产品型号 | ADXL212AEZ |
产品种类 | 加速计 |
传感轴 | Dual |
供应商器件封装 | 8-CLCC(5x5) |
分辨率 | - |
加速 | 2 g |
加速度范围 | ±2g |
商标 | Analog Devices |
安装类型 | 表面贴装 |
安装风格 | SMD/SMT |
封装 | Tube |
封装/外壳 | 8-CLCC |
封装/箱体 | LCC-8 |
工厂包装数量 | 95 |
带宽 | 500Hz |
接口 | - |
数字输出-位数 | - |
数字输出-总线接口 | - |
最大工作温度 | + 125 C |
最小工作温度 | - 55 C |
标准包装 | 1 |
灵敏度 | 12.5%/g |
电压-电源 | 3 V ~ 5.25 V |
电源电压-最大 | 5.25 V |
电源电压-最小 | 3 V |
电源电流 | 0.7 uA |
系列 | ADXL212 |
视频文件 | http://www.digikey.cn/classic/video.aspx?PlayerID=1364138032001&width=640&height=505&videoID=2245193160001http://www.digikey.cn/classic/video.aspx?PlayerID=1364138032001&width=640&height=505&videoID=2245193171001http://www.digikey.cn/classic/video.aspx?PlayerID=1364138032001&width=640&height=505&videoID=2245193161001http://www.digikey.cn/classic/video.aspx?PlayerID=1364138032001&width=640&height=505&videoID=2245193172001 |
轴 | X,Y |
输出类型 | Digital |
Precision ±2 g Dual Axis, PWM Output Accelerometer ADXL212 FEATURES GENERAL DESCRIPTION Dual axis accelerometer on a single IC chip The ADXL212 is a high precision, low power, complete dual 5 mm × 5 mm × 2 mm LCC package axis accelerometer with signal conditioned, duty cycle modulated 5 mg resolution at 60 Hz outputs, all on a single monolithic IC. The ADXL212 measures Low power: 700 μA at VS = 5 V (typical) acceleration with a full-scale range of ±2 g (typical). The ADXL212 High zero g bias stability measures both dynamic acceleration (such as vibration) and High sensitivity accuracy static acceleration (such as gravity). Pulse width modulated digital outputs The outputs are digital signals whose duty cycles (ratio of pulse X- and Y-axis aligned to within 0.1° (typical) width to period) are proportional to acceleration (12.5%/g) in Bandwidth adjustment with a single capacitor each of the two sensitive axes. The duty cycle outputs can be Single-supply operation directly measured by a microcontroller without an analog-to- 3500 g shock survival digital converter (ADC) or glue logic. The output period is APPLICATIONS adjustable from 0.5 ms to 10 ms via a single resistor (R ). SET Automotive tilt alarms The typical noise floor is 500 μg/√Hz, allowing signals below Vehicle dynamic control (VDC)/electronic stability program 5 mg (0.3° of inclination) to be resolved in tilt sensing applica- (ESP) systems tions using narrow bandwidths (<60 Hz). Electronic chassis control The user selects the bandwidth of the accelerometer using Electronic braking Capacitors C and C at the X and Y pins. Bandwidths X Y FILT FILT Data projectors of 0.5 Hz to 500 Hz can be selected to suit the application. Navigation Platform stabilization/leveling The ADXL212 is available in a 5 mm × 5 mm × 2 mm, 8-lead Alarms and motion detectors hermetic LCC package. High accuracy, 2-axis tilt sensing FUNCTIONAL BLOCK DIAGRAM +VS CY VS YFILT ADXL212 32kΩ OUTPUT CDC AC AMP YOUT DEMOD DCM AMP OUTPUT SENSOR AMP 32kΩ XOUT COM ST XFILT T2 CX RSET PWM OUTPUTWAVEFORM SAMPLE t2 t1 A0t2g((g s=)e c=5) 0 (%=t1 R/Dt2SU E–TT Y0/1. 52C)5Y/M1C2ΩL.5E% 09804-001 Figure 1. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved.
ADXL212 TABLE OF CONTENTS Features..............................................................................................1 Applications Information..............................................................10 Applications.......................................................................................1 Power Supply Decoupling.........................................................10 General Description.........................................................................1 Setting the Bandwidth Using C and C .................................10 X Y Functional Block Diagram..............................................................1 Self Test........................................................................................10 Revision History...............................................................................2 Design Trade-Offs for Selecting Filter Characteristics: Noise Specifications.....................................................................................3 vs. Bandwidth.............................................................................10 Absolute Maximum Ratings............................................................4 Using the ADXL212 with Operating Voltages Other Than 5 V .......................................................................................................11 Thermal Resistance......................................................................4 Using the ADXL212 as a Dual Axis Tilt Sensor.....................11 ESD Caution..................................................................................4 Outline Dimensions.......................................................................12 Pin Configuration and Function Descriptions.............................5 Ordering Guide..........................................................................12 Typical Performance Characteristics.............................................6 Theory of Operation........................................................................9 Performance..................................................................................9 REVISION HISTORY 5/11—Revision 0: Initial Version Rev. 0 | Page 2 of 12
ADXL212 SPECIFICATIONS T = –40°C to +85°C, V = 5 V, C = C = 0.1 μF, acceleration = 0 g, unless otherwise noted. All minimum and maximum specifications A S X Y are guaranteed. Typical specifications are not guaranteed. Table 1. Parameter Test Conditions/Comments Min Typ Max Unit SENSOR INPUT Each axis Measurement Range1 ±1.5 ±2 g Nonlinearity Best fit straight line ±0.2 % of FS Package Alignment Error ±1 Degrees Alignment Error X sensor to Y sensor ±0.01 Degrees Cross Axis Sensitivity ±2 % SENSITIVITY (RATIOMETRIC)2 Each axis Sensitivity at X , Y V = 5 V 10 12.5 15 %/g OUT OUT S Sensitivity Change Due to Temperature3 V = 5 V ±0.5 % S ZERO g BIAS LEVEL (RATIOMETRIC) Each axis 0 g Duty Cycle at X , Y 25 50 75 % OUT OUT Initial 0 g Output Deviation from Ideal T = 25°C ±2 % A 0 g Duty Cycle vs. Supply 1.0 4.0 %/V 0 g Offset vs. Temperature ±2 mg/°C NOISE PERFORMANCE Noise Density T = 25°C 500 1000 μg/√Hz rms A FREQUENCY RESPONSE4 3 dB Bandwidth5 500 Hz C , C Range5 0.002 4.7 μF X Y Sensor Resonant Frequency 5.5 kHz SELF TEST6 Duty Cycle Change Self test (ST) pin: pulled low (0) to high (1) 10 % DUTY CYCLE OUTPUT STAGE f 7 R = 125 kΩ 1 kHz SET SET f 7 Tolerance R = 125 kΩ 0.7 1.3 kHz SET SET Voltage Levels High I = 25 μA V − 0.2 V S Low I = 25 μA 200 mV t2 Drift vs. Temperature ±35 ppm/°C Rise/Fall Time 200 ns POWER SUPPLY Operating Voltage Range 3.0 5.25 V Specified Performance 4.75 5.25 V Quiescent Supply Current 0.7 1.1 mA Turn-On Time8 19 ms TEMPERATURE RANGE Specified Performance −40 +85 °C 1 Guaranteed by measurement of initial offset and sensitivity. 2 Sensitivity varies with VS. At VS = 3 V, sensitivity is typically 7.5%/g. 3 Defined as the output change from ambient-to-maximum temperature or ambient-to-minimum temperature. 4 Actual frequency response is controlled by a user supplied external capacitor (CX, CY). 5 Bandwidth = 1/(2 × π × 32 kΩ × C). For CX, CY = 0.002 μF, bandwidth = 2500 Hz. For CX, CY = 4.7 μF, bandwidth = 1 Hz. Minimum/maximum values are not tested. 6 Self test response changes with VS. At VS = 3 V, self test output is typically 6%. 7 The value of fSET is defined by the following equation: 1 f = SET t2 8 Larger values of CX, CY increase turn-on time. Turn-on time is approximately 160 × CX or CY + 3, where CX, CY are in μF, and the resulting turn-on time is in ms. Rev. 0 | Page 3 of 12
ADXL212 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. θ is specified for the worst-case conditions, that is, a device Parameter Rating JA soldered in a circuit board for surface-mount packages. Acceleration (Any Axis, Unpowered) 1000 g Acceleration (Any Axis, Powered) 1000 g Table 3. Thermal Resistance V −0.3 V to +7.0 V S Package Type θ θ Device Weight JA JC Output Short-Circuit Duration Indefinite 8-Lead Ceramic LCC 120°C/W 20°C/W <1.0 g (Any Pin to Common) Operating Temperature Range −55°C to +125°C ESD CAUTION Storage Temperature Range −65°C to +150°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. CRITICALZONE TP tP TLTO TP RAMP-UP URETL TSMAX tL T A ER TSMIN P M E T t PREHSEAT RAMP-DOWN t25°CTO PEAK TIME 09804-002 Figure 2. Recommended Soldering Profile Table 4. Soldering Profile Condition Profile Feature Sn63/Pb37 Pb Free Average Ramp Rate (T to T) 3°C/sec maximum L P Preheat Minimum Temperature (T ) 100°C 150°C SMIN Minimum Temperature (T ) 150°C 200°C SMAX Time (T to T ) (t) 60 sec to 120 sec 60 sec to 150 sec SMIN SMAX S T to T SMAX L Ramp-Up Rate 3°C/sec maximum Time (t) Maintained Above Liquidous (T) L L Liquidous Temperature (T) 183°C 217°C L Time (t) 60 sec to 150 sec 60 sec to 150 sec L Peak Temperature (T) 240°C +0°C/–5°C 260°C +0°C/–5°C P Time Within 5°C of Actual Peak Temperature (t) 10 sec to 30 sec 20 sec to 40 sec P Ramp-Down Rate 6°C/sec maximum Time 25°C to Peak Temperature 6 minutes maximum 8 minutes maximum Rev. 0 | Page 4 of 12
ADXL212 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS ADXL212 TOP VIEW (Not to Scale) VS 8 ST 1 7 XFILT T2 2 6 YFILT COM 3 YO4UT 5 XOUT 09804-003 Figure 3. Pin Configuration Table 5. Pin Function Descriptions Pin No. Mnemonic Description 1 ST Self Test. 2 T2 Frequency Set. Connect the R resistor to ground. SET t2 = R /125 MΩ SET See the Theory of Operation section for details. 3 COM Common. 4 Y Y Channel Output. OUT 5 X X Channel Output. OUT 6 Y Y Channel Filter Pin. FILT 7 X X Channel Filter Pin. FILT 8 V Voltage Supply. 3 V to 5.25 V. S Rev. 0 | Page 5 of 12
ADXL212 TYPICAL PERFORMANCE CHARACTERISTICS V = 5 V, unless otherwise noted. S 25 25 20 20 %) %) N ( N ( O O ATI 15 ATI 15 L L U U P P O O P P OF 10 OF 10 T T N N E E C C R R E 5 E 5 P P 0 0 43 44 45 46 47DUT48Y CY49CLE50 OU51TPU52T (%53) 54 55 56 5709804-004 43 44 45 46 47DUT48Y CY49CLE50 OU51TPU52T (%53) 54 55 56 5709804-007 Figure 4. X-Axis Zero g Bias Deviation from Ideal at 25°C Figure 7. Y-Axis Zero g Bias Deviation from Ideal at 25°C 30 40 35 25 %) %) 30 N ( N ( O 20 O TI TI 25 A A L L U U OP 15 OP 20 P P F F NT O 10 NT O 15 E E RC RC 10 E E P 5 P 5 0 0 –1.0–0.9–0.8–0.7–0.6–0.5–0.4 –0.3TE–0.2MP–0.1CO0 (m0.1g/0.2°C)0.30.40.50.60.70.80.91.0 09804-005 –1.0–0.9–0.8–0.7–0.6–0.5–0.4–0.3TE–0.2MP–0.1CO0 (m0.1g/0.2°C)0.30.40.50.60.70.80.91.0 09804-008 Figure 5. X-Axis Zero g Bias Tempco Figure 8. Y-Axis Zero g Bias Tempco 30 30 25 25 %) %) N ( N ( O 20 O 20 ATI ATI UL UL OP 15 OP 15 P P OF OF NT 10 NT 10 E E C C R R E E P 5 P 5.0 0 0 11.70 11.85 12.00 12.15 SE12.30NSITIV12.45ITY (%12.60/g) 12.75 13.90 13.05 13.20 09804-006 11.70 11.85 12.00 12.15 SE12.30NSITIV12.45ITY (%12.60/g) 12.75 13.90 13.05 13.20 09804-009 Figure 6. X-Axis Sensitivity at 25°C Figure 9. Y-Axis Sensitivity at 25°C Rev. 0 | Page 6 of 12
ADXL212 54.0 13.1 53.5 13.0 53.0 12.9 52.5 52.0 12.8 51.5 CYCLE (%) 555100...005 VITY (%/g) 111222...756 DUTY 444998...055 SENSITI 1122..43 48.0 12.2 47.5 12.1 47.0 46.5 12.0 46.0 11.9 –40 –30 –20 –10 0TE10MPE20RATU30RE (40°C) 50 60 70 80 9009804-010 –50 –40 –30 –20 –10 T0EMP10ERA20TUR30E (°C40) 50 60 70 80 9009804-013 Figure 10. Zero g Bias vs. Temperature, Parts Soldered to PCB Figure 13. Sensitivity vs. Temperature, Parts Soldered to PCB 40 40 35 35 ON (%) 30 N (%) 30 ATI 25 TIO 25 L A U L P U PO 20 OP 20 OF F P NT 15 T O 15 E N C E ER 10 RC 10 P E P 5 5 0 0 100 110 120 130 140NO150ISE160 DE170NSIT180Y (µ190g/ H200z)210 220 230 240 250 09804-011 100 110 120 130 140NO150ISE160 DE170NSIT180Y (µ190g/ H200z)210 220 230 240 250 09804-014 Figure 11. X-Axis Noise Density at 25°C Figure 14. Y-Axis Noise Density at 25°C 10.8 0.9 10.6 0.8 10.4 VS = 5V %)10.2 PUT (10.0 mA) 0.7 UT T ( O 9.8 N 0.6 ELF TEST 99..64 CURRE 0.5 S 9.2 VS = 3V 0.4 9.0 8.8–50 –40 –30 –20 –10 T0EMP10ERA20TUR30E (°C40) 50 60 70 80 9009804-012 0.3–50 0 TEMPERA50TURE (°C) 100 15009804-015 Figure 12. Self Test Response vs. Temperature Figure 15. Supply Current vs. Temperature Rev. 0 | Page 7 of 12
ADXL212 16 18 14 16 %) %)14 N ( 12 N ( ATIO 10 ATIO12 L L PU PU10 O 8 O P P F F 8 O O T 6 T N N 6 E E C C R 4 R E E 4 P P 2 2 0 0 5 1 7 3 8 4 0 6 2 8 3 9 5 5 1 7 3 8 4 0 6 2 8 3 9 5 –12. –12. –11. –11.DE–10.LTA I–10.N DU–10.TY CY–9.CLE–9. (%)–8. –8. –7. –7. 09804-016 –12. –12. –11. –11.DE–10.LTA I–10.N DU–10.TY CY–9.CLE–9. (%)–8. –8. –7. –7. 09804-018 Figure 16. X-Axis Self Test Response at 25°C Figure 18. Y-Axis Self Test Response at 25°C 100 T 90 VS = 5V %) 80 ON ( 70 VS = 3V TI LA 60 U P O 50 P F O 40 T N CE 30 R E P 20 100 TCIXM, EC YS C= A0L.1Eµ F= 2ms/div 09804-019 200 300 400 SUP500PLY CU600RRENT700 (µA) 800 900 1000 09804-017 Figure 17. Supply Current at 25°C Figure 19. Turn-On Time Rev. 0 | Page 8 of 12
ADXL212 THEORY OF OPERATION PIN 8 XOUT= 62.5% YOUT= 50% PIN 8 TOP VIEW PIN 8 XOUT= 50% (Not to Scale) XOUT= 50% YOUT= 37.5% YOUT= 62.5% XOUT= 50% YOUT= 50% PIN 8 XOUT= 37.5% YOUT= 50% EARTH'S SURFACE 09804-020 Figure 20. Output Response vs. Orientation The ADXL212 is a complete dual axis acceleration measure- A single resistor (R ) sets the period for a complete cycle (t2) SET ment system on a single monolithic IC. It contains a polysilicon according to the following equation: surface-micromachined sensor and signal conditioning circuitry t2 (nominal) = R /125 MΩ SET to implement an open-loop acceleration measurement archi- A 0 g acceleration produces a 50% nominal duty cycle. The tecture. The output signals are duty cycle modulated digital acceleration can be determined by measuring the length of the signals proportional to the acceleration. The ADXL212 is capable positive pulse width (t1) and the period (t2). The nominal of measuring both positive and negative accelerations to ±2 g. transfer function of the ADXL212 is The accelerometer can measure static acceleration forces such as gravity, allowing the ADXL212 to be used as a tilt sensor. Acceleration = ((t1/t2) − Zero g Bias)/Sensitivity The sensor is a surface-micromachined polysilicon structure where: built on top of a silicon wafer. Polysilicon springs suspend the Zero g Bias = 50% nominal. structure over the surface of the wafer and provide a resistance Sensitivity = 12.5%/g nominal. against acceleration forces. Deflection of the structure is measured PERFORMANCE using a differential capacitor that consists of independent fixed High performance is built into the device through innovative plates and plates attached to the moving mass. The fixed plates design techniques rather than by using additional temperature are driven by 180° out-of-phase square waves. Acceleration compensation circuitry. As a result, there is essentially no quantiza- deflects the beam and unbalances the differential capacitor, tion error or nonmonotonic behavior, and temperature hysteresis resulting in an output square wave with an amplitude that is is very low (typically less than 10 mg over the −40°C to +85°C proportional to acceleration. Phase sensitive demodulation tech- temperature range). niques are used to rectify the signal and determine the direction of the acceleration. Figure 10 shows the zero g output performance of eight parts (x-axis and y-axis) over a –40°C to +85°C temperature range. The output of the demodulator is amplified and brought off chip through a 32 kΩ resistor, at which point the user can set Figure 13 demonstrates the typical sensitivity shift over temper- the signal bandwidth of the device by adding a capacitor. This ature for VS = 5 V. Sensitivity stability is optimized for VS = 5 V filtering improves measurement resolution and helps prevent but remains very good over the specified range; it is typically aliasing. better than ±2% over temperature at VS = 3 V. After being low-pass filtered, the analog signals are converted to duty cycle modulated outputs that can be read by a counter. Rev. 0 | Page 9 of 12
ADXL212 APPLICATIONS INFORMATION POWER SUPPLY DECOUPLING DESIGN TRADE-OFFS FOR SELECTING FILTER CHARACTERISTICS: NOISE vs. BANDWIDTH For most applications, a single 0.1 μF capacitor, C , adequately DC decouples the accelerometer from noise on the power supply. The chosen accelerometer bandwidth ultimately determines the However, in some cases, particularly where noise is present at measurement resolution (smallest detectable acceleration). Filtering the 140 kHz internal clock frequency (or any harmonic thereof), can be used to lower the noise floor, which improves the resolu- noise on the supply may cause interference on the output of the tion of the accelerometer. Resolution is dependent on the analog ADXL212. If additional decoupling is needed, insert a 100 Ω (or filter capacitors at XFILT and YFILT. smaller) resistor or ferrite beads in the supply line of the ADXL212. The ADXL212 has a typical PWM bandwidth of 500 Hz. The In addition or as an alternative to adding the resistor or ferrite user must filter the signal to a bandwidth lower than 500 Hz to beads, a larger bulk bypass capacitor (in the range of 1 μF to limit aliasing errors. 22 μF) can be added in parallel to C . DC The ADXL212 noise has the characteristics of white Gaussian SETTING THE BANDWIDTH USING CX AND CY noise, which contributes equally at all frequencies and is described in terms of μg/√Hz (that is, the noise is proportional to the square The ADXL212 has provisions for band limiting the X and OUT Y pins. Capacitors must be added at these pins to implement root of the accelerometer bandwidth). To maximize the resolu- OUT tion and dynamic range of the accelerometer, limit bandwidth low-pass filtering for antialiasing and noise reduction. The to the lowest frequency needed by the application. equation for the 3 dB bandwidth is With the single pole roll-off characteristic, the typical noise of f = 1/(2π(32 kΩ) × C ) 3 dB (X, Y) the ADXL212 is determined by or more simply, rmsNoise=(500μg/ Hz)×( BW×1.6) f = 5 μF/C 3 dB (X, Y) The tolerance of the internal resistor (R ) can vary typically as At 100 Hz, the noise is FILT much as ±25% of its nominal value (32 kΩ); the bandwidth varies rmsNoise=(500μg/ Hz)×( 100×1.6)=6.3mg accordingly. A minimum capacitance of 2000 pF for C and C X Y is required in all cases. Often, the peak value of the noise is desired. Peak-to-peak noise can only be estimated by statistical methods. Table 7 is useful Table 6. Filter Capacitor Selection, CX and CY for estimating the probabilities of exceeding various peak values, Bandwidth (Hz) Capacitor (μF) given the rms value. 1 4.7 Table 7. Estimation of Peak-to-Peak Noise 10 0.47 50 0.10 % of Time that Noise Exceeds Peak-to-Peak Value Nominal Peak-to-Peak Value 100 0.05 2 × rms 32 200 0.027 4 × rms 4.6 500 0.01 6 × rms 0.27 SELF TEST 8 × rms 0.006 The ST pin controls the self test feature. When this pin is set to For example, at 100 Hz bandwidth, peak noise exceeds 25.2 mg VS, an electrostatic force is exerted on the beam of the accelero- 4.6% of the time. meter. The resulting movement of the beam allows the user to Peak-to-peak noise values provide the best estimate of the test if the accelerometer is functional. The typical change in uncertainty in a single measurement. Table 8 lists the typical output is 750 mg (corresponding to a duty cycle of 10%) and is noise output of the ADXL212 for various C and C values. additive to the accelerometer outputs. The ST pin can remain X Y open circuit, or it can be connected to ground in normal use. Table 8. Filter Capacitor Selection (C , C ) X Y Never expose the ST pin to voltages greater than VS + 0.3 V. If CX, CY RMS Noise Peak-to-Peak Noise Bandwidth(Hz) (μF) (mg) Estimate (mg) the system design is such that this condition cannot be guaranteed (that is, multiple supply voltages are present), a low V clamping 10 0.47 0.64 3.8 F diode between ST and V is recommended. 50 0.1 1.4 8.6 S 100 0.047 2 12 500 0.01 4.5 27.2 Rev. 0 | Page 10 of 12
ADXL212 USING THE ADXL212 WITH OPERATING An accelerometer is most sensitive to tilt when its sensitive axis VOLTAGES OTHER THAN 5 V is perpendicular to the force of gravity, that is, parallel to the surface of the earth. At this orientation, its response to changes The ADXL212 is tested and specified at V = 5 V; however, it S in tilt is highest: its output changes nearly 17.5 mg per degree of can be powered with V as low as 3 V or as high as 5.25 V. Some S tilt. When the accelerometer is oriented on axis to gravity, that performance parameters change as the supply voltage varies. is, near its +1 g or –1 g reading, the change in output acceleration The ADXL212 sensitivity varies proportionally to supply per degree of tilt is negligible. At 45°, its output changes by voltage. At V = 3 V, the sensitivity is typically 7.5%/g. S 12.2 mg per degree. The zero g bias output is ratiometric to supply voltage; Dual Axis Tilt Sensor: Converting Acceleration to Tilt therefore, the zero g output is nominally equal to 50% at all When the accelerometer is oriented with both its x-axis and supply voltages. y-axis parallel to the surface of the earth (reading approximately Self test response in g is roughly proportional to the square of 0 g), it can be used as a dual axis tilt sensor with a roll axis and a the supply voltage. Therefore, at VS = 3 V, the self test response pitch axis. The output tilt in degrees is calculated as follows: is equivalent to approximately 270 mg (typical), or 6%. Pitch = ASIN(A /1 g) X The supply current decreases as the supply voltage decreases. Roll = ASIN(A /1 g) Typical current consumption at V = 3 V is 450 μA. Y DD where A and A are accelerations in g, ranging from −1 g to +1 g. USING THE ADXL212 AS A DUAL AXIS TILT X Y SENSOR Be sure to account for overranges. It is possible for the accelerometers to output a signal greater than ±1 g due to A common application of the ADXL212 is tilt measurement. An vibration, shock, or other accelerations. accelerometer uses the force of gravity as an input vector to deter- mine its orientation in space. Rev. 0 | Page 11 of 12
ADXL212 OUTLINE DIMENSIONS 0.030 (PLATINGOPTION1, 0.025 SEEDETAILA FOROPTION2) 0.203 0.087 0.054 0.020 0.028 0.197SQ 0.020 0.078 0.050 0.020DIA 0.193 0.015 0.069 0.046 0.012 0.010 (R4PLCS) 7 1 0.180 0.106 0.177SQ 0.075REF 0.100 0.174 R0.008 0.094 (8PLCS) 5 3 R0.008 TOPVIEW 0.008 BOTTOMVIEW (4PLCS) 0.006 0.077 0.004 0.070 0.019SQ 0.063 (ODPETTIAOILNA2) 05-21-2010-D Figure 21. 8-Terminal Ceramic Leadless Chip Carrier [LCC] (E-8-1) Dimensions shown in inches ORDERING GUIDE Number Specified Temperature Package Model1 of Axes Voltage (V) Range Package Description Option ADXL212AEZ 2 5 –40°C to +85°C 8-Terminal Ceramic Leadless Chip Carrier [LCC] E-8-1 ADXL212AEZ–RL 2 5 –40°C to +85°C 8-Terminal Ceramic Leadless Chip Carrier [LCC] E-8-1 EVAL-ADXL212Z Evaluation Board 1 Z = RoHS Compliant Part. ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09804-0-5/11(0) Rev. 0 | Page 12 of 12
Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: EVAL-ADXL212Z ADXL212AEZ ADXL212AEZ-RL