AXO315

Tronic’s Microsystems S.A. 98 rue du Pré de l’Horme, 38920 Crolles, France Phone: +33 (0)4 76 97 29 50 Email: support@tronicsgroup.com www.tronicsgroup.com AXO315 Datasheet Features • • • • • • • • • • ±14 g range in-plane linear single axis accelerometer Hermetic SMD ceramic package for reliable assembly on FR4 Fully hard-coded electronic, no embedded software Built-in temperature compensation and self-test Complementarity with GYPRO® high performance gyros which share the same digital interface Best in-class 1 year composite bias repeatability of 1mg under -55°C to 105°C and > 4g environment Unmatched vibration rejection of 20µg/g² Excellent 1 year composite scale factor repeatability of 600ppm over temperature Very low noise of 15µg/√Hz, non-linearity of 100ppm Non classified under dual-use export control General Description AXO®315 high performance, closed-loop, MEMS accelerometer offers a precision-equivalent alternative to incumbent analog force-rebalance quartz and mechanical accelerometers at a fraction of their size weight and cost. Its hermetic full SMD package combined with its digital 24 bits SPI interface eases its integration and reduces the e-BOM. With a 1 year composite bias repeatability of 1mg under demanding temperature and vibrations conditions, the AXO®315 overpasses all commercially available MEMS accelerometers. AXO®315 is free from dual-use export control, according to Annex 1 of Council Regulation (EC) No 428/2009, as well as REACH and RoHS compliant. AXO® is ideally complemented by GYPRO® high performance digital gyrometers. AXO®315 is a very low noise sensor which provides an excellent linearity and 600 ppm 1 year composite scale factor repeatability over -55°C to +105°C extended temperature range. Our AXO® & GYPRO® products families are well suited to precision attitude, guidance and motion control and GNSSaided positioning applications in demanding industrial, land, railway and naval environments. All AXO® & GYPRO® products sensors are factory calibrated and compensated for temperature effects to provide highaccuracy digital output over a broad temperature range. Raw data output can be also chosen to enable customer-made compensations. Table of Contents Features ................................................................................. 1 General Description ............................................................... 1 Table of Contents ................................................................... 1 Disclaimer............................................................................... 1 Block diagram ..................................................................... 2 Overall Dimensions ............................................................ 2 1. Specifications .............................................................. 3 2. Maximum Ratings ....................................................... 5 3. Typical performances .................................................. 6 4. Interface ...................................................................... 8 4.1. Pinout, Sensitive Axis identification ........................ 8 4.2. Application circuit ................................................... 8 4.3. Input/Output Pin Definitions .................................. 9 5. Soldering Recommendations .................................... 10 6. Digital SPI interface ................................................... 11 6.1. Electrical and Timing Characteristics .................... 11 6.2. SPI frames description .......................................... 12 6.3. Acceleration readings ........................................... 12 6.4. Temperature readings .......................................... 12 6.5. Advanced use of SPI registers ............................... 13 7. Acceleration calibration procedure........................... 15 7.1. Algorithm overview .............................................. 15 7.2. Programming of the new coefficients .................. 16 7.3. Switch to uncompensated data output ................ 17 8. Temperature Sensor Calibration Procedure ............. 18 8.1. Temperature sensor calibration model ................ 18 8.2. Recommended Procedure .................................... 18 9. Device Identification ................................................. 19 10. Internal construction and Theory of Operation ........ 20 11. Available Tools and Resources .................................. 21 Disclaimer Information furnished by Tronics is believed to be accurate and reliable. However, no responsibility is assumed by Tronics for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specification subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Tronics. Trademarks and registered trademarks are the property of their respective owner. ref. : MCD018-G Copyright 2022 Tronic’s Microsystems S.A. All rights reserved. Specification subject to change without notice. Page 1 Tronic’s Microsystems S.A. AXO315 Datasheet 98 rue du Pré de l’Horme, 38920 Crolles, France Phone: +33 (0)4 76 97 29 50 Email: support@tronicsgroup.com www.tronicsgroup.com Block diagram Overall dimensions (with MEMS transducer gravity center in blue) Page 2 Copyright 2022 Tronic’s Microsystems S.A. All rights reserved. Specification subject to change without notice. ref. : MCD018-G Tronic’s Microsystems S.A. 98 rue du Pré de l’Horme, 38920 Crolles, France Phone: +33 (0)4 76 97 29 50 Email: support@tronicsgroup.com www.tronicsgroup.com AXO315 Datasheet 1. Specifications Parameter Unit Typ. Max(2) Notes Measurement Ranges ±14 Electronic clamping is applied and sensors will saturate before ±15g Full Scale range g Temperature range °C -55 to +105 1 Year Composite bias repeatability mg 1 Bias instability µg 4 15 Lowest point of Allan variance curve at room temperature Bias in-run (short term) stability µg 15 45 Standard deviation of the 1 second filtered output over 1 hour at room temperature, after 30 min of stabilization Residual bias temperature error, calibrated (1)(3)(5) mg ±0.5 ±1.5 Maximum variation of the bias over the specified temperature range Bias repeatability µg ±220 Bias long term stability mg 0.4 Drift per year, based on Allan variance extrapolation Warm-up bias drift µg 50 Bias drift during initial sensor self-heating after power on at 0g µg/g² 20 Bias rectification under operating vibrations; root mean square of all axis Bias Vibration rectification error Total bias drift per year, quadratic sum of all bias errors See note (4) Scale Factor Scale factor (1) LSB/g 1 Year Composite scale factor repeatability ppm 600 Residual scale factor temperature error, calibrated ppm ±400 Scale factor repeatability ppm ±280 See note (4) Scale factor long term stability ppm 350 Drift per year, based on Allan variance extrapolation Non linearity (1) ppm 100 350 Maximum deviation of the output from the expected value using a best fit straight line over the [0g ; 8g] range, at room temperature Noise density (1) µg/√Hz 15 20 Over the [0 - 300] Hz frequency range, at room temperature Velocity Random Walk m/s/√h 0.006 -1/2 slope tangent, based on Allan Variance at 1s Bandwidth Hz >300 Defined as the frequency for which attenuation is equal to 3dB Data Rate Hz 2500 Refresh rate of the output data at room temperature Latency ms 1 Time delay between the physical acceleration (input) and the output signal Start-up Time ms 400 Time interval between the application of power and the presence of a usable output, i.e. at least 90% of the input, at room temperature 500 000 Nominal scale factor Total scale factor drift per year, quadratic sum of all scale factor errors ±1000 Maximum variation of the scale factor over the specified temperature range (1)(3) Linearity, Noise Frequency response ref. : MCD018-G Copyright 2022 Tronic’s Microsystems S.A. All rights reserved. Specification subject to change without notice. Page 3 Tronic’s Microsystems S.A. 98 rue du Pré de l’Horme, 38920 Crolles, France Phone: +33 (0)4 76 97 29 50 Email: support@tronicsgroup.com www.tronicsgroup.com AXO315 Datasheet Parameter (2) Unit Typ. Max Notes Axis alignment Axis misalignment mrad 20 By design Environmental Storage temperature range Component shelf life °C -55 to +125 Years 5 Humidity at 45°C %