Datasheet ADIS16228 (Analog Devices)

Digital Triaxial Vibration Sensor with FFT Analysis and Storage Digital Data Sheet ADIS16228 FEATURES GENERAL DESCRIPTION Frequency domain triaxial vibration sensor
The ADIS16228 iSensor® is a complete vibration sensing system
Flat frequency response up to 5 kHz
that combines triaxial acceleration sensing with advanced time
Digital acceleration data, ±18 g measurement range
domain and frequency domain signal processing. Time domain
Digital range settings: 0 g to 1 g /5 g /10 g /20 g
signal processing includes a programmable decimation filter
Real-time sample mode: 20.48 kSPS, single-axis
and selectable windowing function. Frequency domain processing
Capture sample modes: 20.48 kSPS, three axes
includes a 512-point, real-valued FFT for each axis, along with
Trigger modes: SPI, timer, external
FFT averaging, which reduces the noise floor variation for finer
Programmable decimation filter, 11 rate settings
resolution. The 14-record FFT storage system offers users the
Multirecord capture for selected filter settings
ability to track changes over time and capture FFTs with multiple
Manual capture mode for time domain data collection
decimation filter settings.
FFT, 512-point, real valued, all three axes (x, y, z)
The 20.48 kSPS sample rate and 5 kHz flat frequency band
3 windowing options: rectangular, Hanning, flat top
provide a frequency response that is suitable for many machine
Programmable FFT averaging: up to 255 averages
health applications. The aluminum core provides excellent
Storage: 14 FFT records on all three axes (x, y, z)
mechanical coupling to the MEMS acceleration sensors. An
Programmable alarms, 6 spectral bands
internal clock drives the data sampling and signal processing
2-level settings for warning and fault definition
system during all operations, which eliminates the need for an
Adjustable response delay to reduce false alarms
external clock source. The data capture function has three modes
Internal self-test with status flags
that offer several options to meet the needs of many different
Digital temperature and power supply measurements
applications. In addition, real-time mode provides direct access
2 auxiliary digital inputs/outputs SPI-compatible serial interface
to streaming data on one axis. The SPI and data buffer structure
Identification registers: serial number, device ID, user ID
provide convenient access to data output. The ADIS16228 also
Single-supply operation: 3.0 V to 3.6 V
offers a digital temperature sensor and digital power supply
Operating temperature range: −40°C to +125°C
measurements.
15 mm × 24 mm × 15 mm aluminum package, flex connector
The ADIS16228 is available in a 15 mm × 24 mm × 15 mm module
APPLICATIONS
with flanges, machine screw holes (M2 or 2-56), and a flexible connector that enables simple user interface and installation. It
Vibration analysis
has an extended operating temperature range of −40°C to +125°C.
Condition monitoring Machine health Instrumentation, diagnostics Safety shutoff sensing FUNCTIONAL BLOCK DIAGRAM DIO1 DIO2 RST VDD INPUT/ POWER ADIS16228 ALARMS GND OUTPUT MANAGEMENT CS TRIAXIAL CONTROLLER CONTROL MEMS REGISTERS SENSOR SCLK SPI PORT TEMP DIN SENSOR FILTER CAPTURE RECORD OUTPUT ADC WINDOW DOUT BUFFER STORAGE REGISTERS FFT SUPPLY
001 10069- Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS Timing Diagrams ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS THEORY OF OPERATION SENSING ELEMENT SIGNAL PROCESSING USER INTERFACE SPI Interface Dual-Memory Structure BASIC OPERATION SPI WRITE COMMANDS SPI READ COMMANDS DATA RECORDING AND SIGNAL PROCESSING RECORDING MODE Manual FFT Mode Automatic FFT Mode Manual Time Capture Mode Real-Time Mode SPECTRAL RECORD PRODUCTION SAMPLE RATE/FILTERING DYNAMIC RANGE/SENSITIVITY Frequency Response Correction Axial Definitions Dynamic Range Settings Scale Adjustment PRE-FFT WINDOWING FFT FFT Averaging RECORDING TIMES DATA RECORDS FFT RECORD FLASH ENDURANCE SPECTRAL ALARMS ALARM DEFINITION Alarm Band Frequency Definitions Alarm Trigger Settings Enable Alarm Settings ALARM INDICATOR SIGNALS ALARM FLAGS AND CONDITIONS ALARM STATUS WORST-CASE CONDITION MONITORING READING OUTPUT DATA READING DATA FROM THE DATA BUFFER ACCESSING FFT RECORD DATA DATA FORMAT REAL-TIME DATA COLLECTION POWER SUPPLY/TEMPERATURE FFT EVENT HEADER SYSTEM TOOLS GLOBAL COMMANDS STATUS/ERROR FLAGS POWER-DOWN OPERATION MANAGMENT Software Busy Indicator Software Escape Code INPUT/OUTPUT FUNCTIONS Busy Indicator Trigger Input Alarm Indicator General-Purpose Input/Output SELF-TEST FLASH MEMORY MANAGEMENT DEVICE IDENTIFICATION APPLICATIONS INFORMATION INTERFACE BOARD FLEX CONNECTOR CARE MATING CONNECTOR OUTLINE DIMENSIONS ORDERING GUIDE