Wide Bandwidth, Low Noise, Triaxial Vibration Sensor Data Sheet ADcmXL3021 FEATURES FUNCTIONAL BLOCK DIAGRAM VDD GND Triaxial, digital output MEMS vibration sensing module 50 g measurement range POWER MANAGEMENT OUT VDDM Ultralow output noise density, 26 g/Hz (MTC mode) Wide bandwidth: dc to 10 kHz within 3 dB flatness (RTS mode) MEMS RST Embedded fast data sampling: 220 kSPS per axis ACCELEROMETER ADC CS X 6 digital FIR filters, 32 taps (coefficients), default options: SCLK DIN High-pass filter cutoff frequencies: 1 kHz, 5 kHz, 10 kHz MEMS ADC ACCELEROMETER DOUT Low-pass filter cutoff frequencies: 1 kHz, 5 kHz, 10 kHz Y SYNC/RTS User configurable digital filter option (32 coefficients) BUSY MEMS ALM1 Spectral analysis through internal FFT ACCELEROMETER ADC ALM2 Z Extended record length: 2048 bins per axis with user ADcmXL3021 configurable bin sizes from 0.42 Hz to 53.7 Hz Manual or timer-based (automatic) triggering Figure 1. Windowing options: rectangular, Hanning, flat top GENERAL DESCRIPTION FFT record averaging, configurable up to 255 records The ADcmXL3021 is a complete vibration sensing system that Spectral defined alarm monitoring, 6 alarms per axis Time domain capture with statistical metrics combines high performance vibration sensing (using micro- Extended record length: 4096 samples per axis electromechanical systems (MEMS) accelerometers) with a Mean, standard deviation, peak, crest factor, skewness, variety of signal processing functions to simplify the development and kurtosis of smart sensor nodes in condition-based monitoring (CBM) Configurable alarm monitoring systems. The typical ultralow noise density (26 g/Hz) in the Real-time data streaming MEMS accelerometers supports excellent resolution. The wide 220 kSPS on each axis by default bandwidth (dc to 10 kHz within 3 dB flatness) enables tracking User programmable sample rates of key vibration signatures on many machine platforms. Burst mode communication with CRC-16 error checking The signal processing includes high speed data sampling Storage: 10 data records for each axis (220 kSPS), 4096 time sample record lengths, filtering, On demand self test with status flags Sleep mode with external and timer driven wakeup windowing, fast Fourier transform (FFT), user configurable Digital temperature and power supply measurements spectral or time statistic alarms, and error flags. The serial SPI-compatible serial interface peripheral interface (SPI) provides access to a register structure Identification registers: factory preprogrammed serial that contains the vibration data and a wide range of user number, device ID, user programmable ID configurable functions. Single-supply operation: 3.0 V to 3.6 V The ADcmXL3021 is available in a 23.7 mm 27.0 mm 12.4 mm Operating temperature range: 40C to +105C aluminum package with four mounting flanges to support Automatic shutdown at 125C (junction temperature) installation with standard machine screws. This package provides 23.7 mm 27.0 mm 12.4 mm aluminum package consistent mechanical coupling to the core sensors over a broad 36 mm flexible, 14-pin connector interface frequency range. The electrical interface is through a 14-pin Mass: 13 g connector on a 36 mm flexible cable, which enables a wide APPLICATIONS range of location and orientation options for system mating Vibration analysis connectors. CBM systems The ADcmXL3021 requires only a single, 3.3 V power supply and Machine health supports an operating temperature range of 40C to +105C. Instrumentation and diagnostics Safety shutoff sensing Rev. A Document Feedback 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 Tel: 781.329.4700 20192021 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. EMBEDDED PROCESSING INTERFACE 16806-001ADcmXL3021 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Z BUF/RSS BUF, Buffer Access Register, Z-Axis ..................... 35 Applications ....................................................................................... 1 X ANULL, X-AXIS Bias Calibration Register ....................... 36 Functional Block Diagram .............................................................. 1 Y ANULL, Y-AXIS Bias Calibration Register ....................... 36 General Description ......................................................................... 1 Z ANULL, Z-AXIS Bias Calibration Register ....................... 36 Revision History ............................................................................... 3 REC CTRL, Recording Control .............................................. 36 Specif ications ..................................................................................... 4 RT CTRL, Real TIme Streaming Control .............................. 38 Timing Specifications .................................................................. 5 REC PRD, Record Period ......................................................... 38 Absolute Maximum Ratings ............................................................ 7 ALM F LOW, Alarm Frequency Band .................................. 38 Thermal Resistance ...................................................................... 7 ALM F HIGH, Alarm Frequency Band ................................ 38 ESD Caution .................................................................................. 7 ALM X MAG1, Alarm Level 1 X-Axis .................................. 39 Pin Configuration and Function Descriptions ............................. 8 ALM Y MAG1, Alarm Level 1 Y-Axis .................................. 39 Typical Performance Characteristics ............................................. 9 ALM Z MAG1, Alarm Level 1 Z-Axis .................................. 39 Theory of Operation ...................................................................... 14 ALM X MAG2, Alarm Level 2 X-Axis .................................. 39 Core Sensors ................................................................................ 14 ALM Y MAG2, Alarm Level 2 Y-Axis .................................. 40 Signal Processsing ...................................................................... 14 ALM Z MAG2, Alarm Level 2 Z-Axis .................................. 40 Modes of Operation ................................................................... 15 ALM PNTR, Alarm Pointer ..................................................... 40 Data Recording Options ............................................................ 16 ALM S MAG Alarm Level ...................................................... 40 User Interface .............................................................................. 19 ALM CTRL, Alarm Conrol ..................................................... 40 Basic Operation............................................................................... 22 FILT CTRL, Filter Control ....................................................... 41 Device Configuration ................................................................ 22 AVG CNT, Decimation Control .............................................. 41 Dual Memory Structure ............................................................ 22 DIAG STAT, Status, and Error Flags ....................................... 42 Power-Up Sequence ................................................................... 22 GLOB CMD, Global Commands ............................................ 42 Trigger .......................................................................................... 22 ALM X STAT, Alarm Status X-Axis ...................................... 42 Sample Rate ................................................................................. 23 ALM Y STAT, Alarm Status Y-Axis....................................... 43 Datapath Processing ................................................................... 23 ALM Z STAT, Alarm Status Z-axis ........................................ 43 Spectral Alarms ........................................................................... 25 ALM X PEAK, Alarm Peak Level X-Axis ............................. 43 Mechanical Mounting Recommendations .............................. 25 ALM Y PEAK, Alarm Peak LeveL Y-AXIS .......................... 43 User Register Memory Map .......................................................... 26 ALM Z PEAK, Alarm Peak Level Z-AXIS............................ 43 User Register Details ...................................................................... 32 TIME STAMP L and TIME STAMP H, Data Record Timest amp ................................................................................... 44 PAGE ID (Page Number) ......................................................... 32 DAY REV, Day and Revision ................................................... 44 TEMP OUT (Internal Temperature) ...................................... 32 YEAR MON, Year and Month ................................................. 44 SUPPLY OUT (Power Supply Voltage) .................................. 32 PROD ID, Product Identification ........................................... 44 FFT AVG1, Spectral Averaging ............................................... 32 SERIAL NUM, Serial Number ................................................ 44 FFT AVG2, Spectral Averaging ............................................... 33 USER SCRATCH ...................................................................... 44 BUF PNTR, Buffer Pointer ...................................................... 33 REC FLASH CNT, Record Flash Endurance ....................... 44 REC PNTR, Record Pointer ..................................................... 34 MISC CTRL, Miscellaneous Control ..................................... 45 X BUF, Buffer Access Register, X-Axis ................................... 34 REC INFO1, Record Information ........................................... 45 Y BUF, Buffer Access Register, Y-Axis ................................... 35 Rev. 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