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PDF ADIS16227 Data sheet ( Hoja de datos )
| Número de pieza | ADIS16227 | |
| Descripción | Digital Tri-Axial Vibration Sensor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
FEATURES
Frequency domain triaxial vibration sensor
Digital acceleration data, ± 70 g measurement range
Digital range settings: 1 g, 5 g, 20 g, 70 g
Sample rate: 100.2 kHz, 4 decimation filter settings
FFT, 512 point, real valued, all three axes (x, y, z)
Windowing options: rectangular, Hanning, flat top
Programmable FFT averaging, up to 256 averages
Storage, 16 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
Trigger modes: SPI command, timer, external trigger
Multirecord capture for selected filter settings
Manual capture mode for time-domain data collection
Internal self-test with status flags
Digital temperature and power supply measurements
2 auxiliary digital I/Os
SPI-compatible serial interface
Serial number and device ID
Single-supply operation: 3.15 V to 3.6 V
Operating temperature range: −40°C to +125°C
15 mm × 15 mm × 15 mm aluminum package, flex connector
APPLICATIONS
Vibration analysis
Condition monitoring
Machine health
Instrumentation, diagnostics
Safety shutoff sensing
Digital Triaxial Vibration Sensor
with FFT Analysis and Storage
ADIS16227
GENERAL DESCRIPTION
The ADIS16227 iSensor® is a complete vibration sensing system
that combines wide bandwidth, 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 16-record FFT storage system offers
users the ability to track changes over time and to capture FFTs
with multiple decimation filter settings.
The 22 kHz sensor resonance and 100.2 kSPS sample rate
provide a frequency response that is suitable for 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 applica-
tions.
The SPI and data buffer structure provide convenient access
to wide bandwidth sensor data. The ADIS16227 also offers a
digital temperature sensor and digital power supply measure-
ments.
The ADIS16227 is available in a 15 mm × 15 mm × 15 mm module
with a threaded hole for stud mounting with a 10-32 UNF screw.
The dual-row, 1 mm, 14-pin, flexible connector enables simple
user interface and installation. The ADIS16227 is footprint and
pin-for-pin compatible with the ADIS16223. It has an extended
operating temperature range of −40°C to +125°C.
ADIS16227
TRIAXIAL
MEMS
SENSOR
TEMP
SENSOR
SUPPLY
FUNCTIONAL BLOCK DIAGRAM
DIO1 DIO2 RST
VDD
INPUT/
OUTPUT
ALARMS
POWER
MANAGEMENT
ADC
CONTROLLER
CAPTURE
BUFFER
FILTER
WINDOW
FFT
RECORD
STORAGE
CONTROL
REGISTERS
OUTPUT
REGISTERS
SPI
PORT
GND
CS
SCLK
DIN
DOUT
Figure 1.
Rev. B
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
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 ©2010–2012 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
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.
ADIS16227
Table 4. Package Characteristics
Package Type
θJA
θJC
14-Lead Module
31°C/W 11°C/W
Device Weight
6.5 grams
ESD CAUTION
Rev. B | Page 5 of 24
Free Datasheet http://www.datasheet4u.com/
5 Page 
Data Sheet
POWER-DOWN
Set GLOB_CMD[1] = 1 (DIN = 0xBE02) to power down the
ADIS16227. To reduce power consumption, set REC_CTRL[7]
= 1 to automatically power down after a record has completed.
Toggle the CS line from high to low to wake the device up and
place it in an idle state, where it waits for the next command.
When configured as an external trigger option, toggling DIO1
or DIO2 can wake the device up as well. Using DIO1 or DIO2
for this purpose avoids the potential for multiple devices
contending for DOUT when waking up with the CS line
approach. After completing the record cycle, the device remains
awake. Use GLOB_CMD[1] to put it back to sleep after reading
the record data.
RECORD STORAGE MODE
After the ADIS16227 finishes processing FFT data, it stores the
data into the FFT buffer, where it is available for external access
using the SPI and x_BUF registers. REC_CTRL[3:2] provides
programmable conditions for writing buffer data into the FFT
records, which are in nonvolatile flash memory locations. Set
REC_CTRL[3:2] = 01 to store FFT buffer data into the flash
memory records only when an alarm condition is met. Set
REC_CTRL[3:2] = 10 to store every set of FFT data into the
flash memory locations. The flash memory record provides
space for a total of 16 records. Each record stored in flash
memory contains a header and frequency domain (FFT) data
from all three axes (x, y, and z). When all 16 records are full,
new records do not load into the flash memory. The
REC_CNTR register (see Table 13) provides a running count
for the number of records that are stored. Set GLOB_CMD[8] =
1 (DIN = 0xBF01) to clear all of the records in flash memory.
Table 13. REC_CNTR Bit Descriptions
Bits Description (Default = 0x0000)
[15:5] Not used
[4:0] Total number of records taken, range = 0 to 16, binary
SAMPLE RATE OPTIONS
The analog-to-digital converter (ADC) samples each accelero-
meter sensor at a rate of 100.2 kSPS (fs). REC_CTRL[11:8] provide
four different sample rate options for FFT analysis: SR0 (fs),
SR1(fs ÷ 8), SR2 (fs ÷ 64), and SR3 (fs ÷ 512). The reduced rates
come from a decimation filter, which reduces the bandwidth
and bin widths. See Figure 13 for the filter location in the signal
processing diagram and Table 14 for the performance trade-offs
associated with each sample rate setting.
ADIS16227
Table 14. Sample Rate Settings and Filter Performance
Sample Rate Bin Width Bandwidth Noise
Setting (SPS)
(Hz) (Hz)
(mg)
SR0 100,189
196
26,000
467
SR1 12,524
25
6,262
260
SR2 1566
3.1 783
100
SR3 196
0.38 98
38
Table 15 provides the data sampling time (TS) for each sample
rate setting. This represents the time it takes to record data for
all three axes of vibration data.
Table 15. Sample Times, TS
Sample Rate Setting
SR0, REC_CTRL[8] = 1
SR1, REC_CTRL[9] = 1
SR2, REC_CTRL[10] = 1
SR3, REC_CTRL[11] = 1
Sample Time (ms), TS
5.27
42.15
337.17
2697.39
If more than one sample rate setting is active in REC_CTRL[11:8],
the sample rate setting automatically updates after each FFT
event and waits for the next trigger input. The order of priority
starts with the highest sample rate enabled and works toward the
lowest after each REC_CTRL[11:8] write cycle. When used in
conjunction with automatic trigger mode and record storage,
FFT analysis for each sample rate option requires no further
user inputs, except for collecting the data. Depending on the
number of FFT averages, the time period between each sample
rate selection may be quite large. Note that selecting multiple
sample rates reduces the number of records available for each
sample rate setting, as shown in Table 16.
Table 16. Available Records
Number of Sample Rates Selected
1
2
3
4
Available Records
16
8
5
4
WINDOWING OPTIONS
REC_CTRL[13:12] provide three options for pre-FFT
windowing of time data. For example, set REC_CTRL[13:12] =
01 to use the Hanning window, which offers the best amplitude
resolution of the peaks between frequency bins and minimal
broadening of peak amplitudes. The rectangular and flat top
windows are also available because they are common windowing
options for vibration monitoring. The flat top window provides
accurate amplitude resolution with a trade-off of broadening
the peak amplitudes.
Rev. B | Page 11 of 24
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