Micropower, 3-Axis,
±200 g Digital Output, MEMS
Data Sheet
ADXL372
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FEATURES
±200 g measurement range
200 Hz to 3200 Hz user selectable bandwidth with 4-pole
antialiasing filter
Selectable oversampling ratio
Adjustable high-pass filter
Ultralow power
Power can be derived from a coin cell battery
22 µA at 3200 Hz ODR, 2.5 V supply
Low power, wake-up mode for low g activity detection
1.4 µA instant on mode with adjustable threshold
<0.1 µA standby mode
Built in features for system level power savings
Autonomous interrupt processing without processor
intervention
Deep embedded FIFO to minimize host processor load
Ultralow power event monitoring detects impacts and wakes
up fast enough to capture the transient events
Ability to capture and store peak acceleration values of
events
Adjustable, low g threshold activity and inactivity detection
Wide supply range: 1.6 V to 3.5 V
Acceleration sample synchronization via external trigger
SPI digital interface and limited I
2
C interface format support
12-bit output at 100 mg/LSB scale factor
Wide temperature range: −40°C to +105°C
Small, thin, 3 mm × 3.25 mm × 1.06 mm package
APPLICATIONS
Impact and shock detection
Asset health assessment
Portable Internet of Things (IoT) edge nodes
Concussion and head trauma detection
GENERAL DESCRIPTION
The ADXL372 is an ultralow power, 3-axis, ±200 g MEMS
accelerometer that consumes 22 µA at a 3200 Hz output data
rate (ODR). The ADXL372 does not power cycle its front end to
achieve its low power operation and therefore does not run the
risk of aliasing the output of the sensor.
In addition to its ultralow power consumption, the ADXL372
has many features to enable impact detection while providing
system level power reduction. The device includes a deep
multimode output first in, first out (FIFO), several activity
detection modes, and a method for capturing only the peak
acceleration of over threshold events.
Two additional lower power modes with interrupt driven, wake-up
features are available for monitoring motion during periods of
inactivity. In wake-up mode, acceleration data can be averaged to
obtain a low enough output noise to trigger on low g thresholds. In
instant on mode, the ADXL372 consumes 1.4 µA while continuously
monitoring the environment for impacts. When an impact event
that exceeds the internally set threshold is detected, the device
switches to normal operating mode fast enough to record the event.
High g applications tend to experience acceleration content over
a wide range of frequencies. The
ADXL372 includes a 4-pole low-
pass antialiasing filter to attenuate out of band signals that are
common in high g applications. The ADXL372 also incorporates
a high-pass filter to eliminate initial and slow changing errors,
such as ambient temperature drift.
The ADXL372 provides 12-bit output data at 100 mg/LSB scale
factor. The user can access configuration and data registers via
the serial peripheral interface (SPI) or limited I
2
C protocol. The
ADXL372 operates over a wide supply voltage range and is available
in a 3 mm × 3.25 mm × 1.06 mm package.
Multifunction pin names may be referenced by their relevant
function only.
FUNCTIONAL BLOCK DIAGRAM
V
S
V
DDI/O
GND
3-AXIS
MEMS
SENSOR
AXIS
DEMODULATORS
4-POLE
ANTIALIASING
FILTERS
ADXL372
12-BIT
ADC
DIGITAL
LOGIC,
FIFO,
AND
SPI
INT1
INT2
MOSI
MISO
CS
SCLK
15430-001
Figure 1.
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