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PDF ADIS16228 Data sheet ( Hoja de datos )
| Número de pieza | ADIS16228 | |
| Descripción | Digital Tri-Axial Vibration Sensor | |
| Fabricantes | Analog Devices | |
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Data Sheet
Digital Triaxial Vibration Sensor
with FFT Analysis and Storage
ADIS16228
FEATURES
Frequency domain triaxial vibration sensor
Flat frequency response up to 5 kHz
Digital acceleration data, ±18 g measurement range
Digital range settings: 0 g to 1 g/5 g/10 g/20 g
Real-time sample mode: 20.48 kSPS, single-axis
Capture sample modes: 20.48 kSPS, three axes
Trigger modes: SPI, timer, external
Programmable decimation filter, 11 rate settings
Multirecord capture for selected filter settings
Manual capture mode for time domain data collection
FFT, 512-point, real valued, all three axes (x, y, z)
3 windowing options: rectangular, Hanning, flat top
Programmable FFT averaging: up to 255 averages
Storage: 14 FFT records on all three axes (x, y, z)
Programmable alarms, 6 spectral bands
2-level settings for warning and fault definition
Adjustable response delay to reduce false alarms
Internal self-test with status flags
Digital temperature and power supply measurements
2 auxiliary digital I/Os
SPI-compatible serial interface
Identification registers: serial number, device ID, user ID
Single-supply operation: 3.0 V to 3.6 V
Operating temperature range: −40°C to +125°C
15 mm × 24 mm × 15 mm aluminum package, flex connector
APPLICATIONS
Vibration analysis
Condition monitoring
Machine health
Instrumentation, diagnostics
Safety shutoff sensing
GENERAL DESCRIPTION
The ADIS16228 iSensor® is a complete vibration sensing system
that combines triaxial acceleration sensing with advanced time
domain and frequency domain signal processing. Time domain
signal processing includes a programmable decimation filter
and selectable windowing function. Frequency domain processing
includes a 512-point, real-valued FFT for each axis, along with
FFT averaging, which reduces the noise floor variation for finer
resolution. The 14-record FFT storage system offers users the
ability to track changes over time and capture FFTs with multiple
decimation filter settings.
The 20.48 kSPS sample rate and 5 kHz flat frequency band
provide a frequency response that is suitable for many machine
health applications. The aluminum core provides excellent
mechanical coupling to the MEMS acceleration sensors. An
internal clock drives the data sampling and signal processing
system during all operations, which eliminates the need for an
external clock source. The data capture function has three modes
that offer several options to meet the needs of many different
applications. In addition, real-time mode provides direct access
to streaming data on one axis. The SPI and data buffer structure
provide convenient access to data output. The ADIS16228 also
offers a digital temperature sensor and digital power supply
measurements.
The ADIS16228 is available in a 15 mm × 24 mm × 15 mm module
with flanges, machine screw holes (M2 or 2-56), and a flexible
connector that enables simple user interface and installation. It
has an extended operating temperature range of −40°C to +125°C.
FUNCTIONAL BLOCK DIAGRAM
DIO1 DIO2 RST
VDD
ADIS16228
INPUT/
OUTPUT
ALARMS
POWER
MANAGEMENT
GND
TRIAXIAL
MEMS
SENSOR
TEMP
SENSOR
SUPPLY
ADC
CONTROLLER
CAPTURE
BUFFER
FILTER
WINDOW
FFT
RECORD
STORAGE
CONTROL
REGISTERS
OUTPUT
REGISTERS
SPI
PORT
CS
SCLK
DIN
DOUT
Figure 1.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
Free Datasheet http://www.datasheet4u.com/
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Acceleration
Any Axis, Unpowered
Any Axis, Powered
VDD to GND
Digital Input Voltage to GND
Digital Output Voltage to GND
Analog Inputs to GND
Temperature
Operating Temperature Range
Storage Temperature Range
Rating
2000 g
2000 g
−0.3 V to +6.0 V
−0.3 V to +5.3 V
−0.3 V to +3.6 V
−0.3 V to +3.6 V
−40°C to +125°C
−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.
ADIS16228
Table 4. Package Characteristics
Package Type
θJA
θJC
15-Lead Module
31°C/W 11°C/W
Device Weight
6.5 grams
ESD CAUTION
Rev. B | Page 5 of 28
Free Datasheet http://www.datasheet4u.com/
5 Page 
Data Sheet
ADIS16228
DATA RECORDING AND SIGNAL PROCESSING
The ADIS16228 provides a complete sensing system for recording
and monitoring vibration data. Figure 13 provides a simplified
block diagram for the signal processing associated with spectral
record acquisition on all three axes (x, y, z). User registers
provide controls for data type (time or frequency), trigger mode
(manual or automatic), collection mode (real time or capture),
sample rates/filtering, windowing, FFT averaging, spectral alarms,
and I/O management.
RECORDING MODE
The recording mode selection establishes the data type (time or
frequency domain), trigger type (manual or automatic), and
data collection (captured or real time). The REC_CTRL1[1:0]
bits (See Table 9) provide four operating modes: manual FFT,
automatic FFT, manual time capture, and real time. After setting
REC_CTRL1, the manual FFT, automatic FFT, and manual time
capture modes require a start command to start acquiring a
spectral or time domain record. There are two start command
options in this mode: SPI and I/O. The SPI trigger involves setting
GLOB_CMD[11] = 1 (DIN = 0xBF08). The I/O trigger involves
using DIO_CTRL (see Table 66) to configure DIO1 or DIO2 as
an input trigger line.
Table 9. REC_CTRL1 (Base Address = 0x1A), Read/Write
Bits Description (Default = 0x1100)
[15:14] Not used (don’t care).
[13:12] Window setting.
00 = rectangular, 01 = Hanning, 10 = flat top, 11 = N/A.
11 SR3, 1 = enabled for FFT, 0 = disable.
Sample rate = 20,480 ÷ 2AVG_CNT[15:12] (see Table 11).
10 SR2, 1 = enabled for FFT, 0 = disable.
Sample rate = 20,480 ÷ 2AVG_CNT[11:8] (see Table 11).
9 SR1, 1 = enabled for FFT, 0 = disable.
Sample rate = 20,480 ÷ 2AVG_CNT[7:4] (see Table 11).
8 SR0, 1 = enabled for FFT, 0 = disable.
Sample rate = 20,480 ÷ 2AVG_CNT[3:0] (see Table 11).
7 Power-down between each recording. 1 = enabled.
[6:4] Not used (don’t care).
[3:2] Storage method.
00 = none, 01 = alarm trigger, 10 = all, 11 = N/A.
[1:0] Recording mode.
00 = manual FFT, 01 = automatic FFT,
10 = manual time capture, 11 = real-time sampling/data
access.
Manual FFT Mode
Set REC_CTRL1[1:0] = 00 to place the device in manual FFT
mode. Then use a start command to trigger the production of a
spectral record. When the device is acquiring a spectral record,
use the busy indicator (DIO1, per factory default) to drive an
interrupt service line on an external processor, which can start
data collection after the process completes. DIAG_STAT is the
only register that the SPI can read while the device is processing
a command. Reading this register returns a 0x00 while the device
is busy and 0x80 when the data is ready for external access. When
the spectral record is complete, the device waits for another start
command.
Automatic FFT Mode
Set REC_CTRL1[1:0] = 01 to place the device in automatic FFT
mode. Use the REC_PRD register (see Table 10) to program the
period between production of each spectral record. Then use a
start command to trigger periodic acquistion of a spectral record.
For example, set REC_PRD = 0x020A (DIN = 0x9E0A, 0x9F02)
to set the trigger period to 10 hours.
Table 10. REC_PRD (Base Address = 0x1E), Read/Write
Bits Description (Default = 0x0000)
[15:10] Not used (don’t care)
[9:8] Scale for data bits
00 = 1 second/LSB, 01 = 1 minute/LSB, 10 = 1 hour/LSB
[7:0] Data bits, binary format; range = 0 to 255
Manual Time Capture Mode
Set REC_CTRL1[1:0] = 10 to place the device into manual time
capture mode; then use a manual trigger to start a data collection
cycle. When the device is operating in this mode, 512 samples
of time domain data are loaded into the buffer for each axis.
This data goes through all time domain signal processing, except
the pre-FFT windowing, prior to loading into the data buffer for
user access. The manual trigger options are the same as in the
manual FFT mode (SPI, I/O).
MEMS
ADC
PROCESSING
DATA
BUFFER
SPI AND
REGISTERS
RECORDS
Figure 13. Simplified Block Diagram
Rev. B | Page 11 of 28
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