Wide Bandwidth, Low Noise,
Vibration Sensor
Data Sheet
ADcmXL1021-1
FEATURES
FUNCTIONAL BLOCK DIAGRAM
VDD
GND
Single axis, digital output MEMS vibration sensing module
±±0 g measurement range
OUT_VDDM
POWER MANAGEMENT
Ultralow output noise density, 26 μg/√Hz (MTC mode)
Wide bandwidth: dc to 10 kHz within 3 dB flatness (RTS mode)
Embedded fast data conversion rate: 220 kSPS
6 digital FIR filters, 32 taps (coefficients), default options
High-pass filter cutoff frequencies: 1 kHz, ± kHz, 10 kHz
Low-pass filter cutoff frequencies: 1 kHz, ± kHz, 10 kHz
User configurable digital filter option (32 coefficients)
Spectral analysis through internal FFT
RST
CS
SCLK
DIN
MEMS
ACCELEROMETER
ADC
DOUT
SYNC/RTS
BUSY
ALM1
ALM2
Extended record length: 2048 bins with user configurable
bin sizes from 0.42 Hz to ±3.7 Hz
ADcmXL1021-1
Manual or timer-based (automatic) triggering
Windowing options: rectangular, Hanning, flat top
FFT record averaging, configurable up to 2±± records
Spectral defined alarm monitoring, 6 alarms
Time domain capture with statistical metrics
Extended record length: 4096 samples
Mean, standard deviation, peak, crest factor, skewness,
and Kurtosis
Configurable alarm monitoring
Figure 1.
GENERAL DESCRIPTION
The ADcmXL1021-1 is a complete vibration sensing system that
combines high performance vibration sensing (using a micro-
electromechanical systems (MEMS) accelerometer) with a variety
of signal processing functions to simplify the development of
smart sensor nodes in condition-based monitoring (CBM)
systems. The typical ultralow noise density (26 μg/√Hz) in the
MEMS accelerometers supports excellent resolution. The wide
bandwidth (dc to 10 kHz within 3 dB flatness) enables tracking
of key vibration signatures on many machine platforms.
Real-time data streaming at 220 kSPS
Burst mode communication with CRC-16 error checking
Storage: 10 data records
On demand self test with status flags
The signal processing includes high speed data sampling
(220 kSPS), 4096 time sample record lengths, filtering,
windowing, fast Fourier transform (FFT), user configurable
spectral or time statistic alarms, and error flags. The serial
peripheral interface (SPI) provides access to a register structure
that contains the vibration data and a wide range of user
configurable functions.
Sleep mode with external and timer driven wakeup
Digital temperature and power supply measurements
SPI-compatible serial interface
Identification registers: factory preprogrammed serial
number, device ID, user programmable ID
Single-supply operation: 3.0 V to 3.6 V
Operating temperature range: −40°C to +10±°C
Automatic shutdown at 12±°C (junction temperature)
23.7 mm × 27.0 mm × 12.4 mm aluminum package
36 mm flexible, 14-lead module with integrated flexible
connector
The ADcmXL1021-1 is available in a 23.7 mm × 27.0 mm ×
12.4 mm aluminum package with four mounting flanges to
support installation with standard machine screws. This light
weight package (13 g) provides consistent mechanical coupling
to the core sensors over a broad frequency range. The electrical
interface is through a 14-lead connector on a 36 mm flexible
cable, which enables a wide range of location and orientation
options for system mating connectors.
Mass: 13 g
APPLICATIONS
Vibration analysis
Condition-based monitoring (CbM) systems
Machine health
The ADcmXL1021-1 requires only a single, 3.3 V power supply
and supports an operating temperature range of −40°C to +105°C.
Instrumentation and diagnostics
Safety shutoff sensing
Multifunction pin names may be referenced by their relevant
function only.
Rev. 0
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