Micropower, 3-Axis, 400 g, Digital Output,
MEMS Accelerometer
Data Sheet
ADXL373
FEATURES
GENERAL DESCRIPTION
400 g measurement range
160 Hz to 2560 Hz user selectable bandwidth with 4-pole
antialiasing filter
Selectable oversampling ratio
Adjustable high-pass filter
Ultra Low power
Power can be derived from a coin cell battery
19 µA at 2560 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
Ultra low power event monitoring: detects impacts and
wakes up fast enough to capture the transient events
Adjustable low g threshold activity and inactivity detection
Wide operating voltage range: 1.6 V to 3.5 V
Acceleration sample synchronization via external trigger
SPI digital interface and I2C interface format support
12-bit output at 200 mg/LSB scale factor
Wide temperature range: −40°C to +105°C
Small, thin 3.00 mm × 3.25 mm × 1.06 mm package
The ADXL373 is an ultra low power, 3-axis, 400 g
microelectromechanical systems (MEMS) accelerometer that
consumes 19 µA at a 2560 Hz output data rate (ODR). The
ADXL373 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 ultra low power consumption, the ADXL373
enables impact detection while providing system level power
reduction.
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 ADXL373 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 ADXL373 includes a four-pole,
low-pass antialiasing filter to attenuate out-of-band signals that are
common in high g applications. The ADXL373 also incorporates a
high-pass filter to eliminate initial and slow changing errors
such as ambient temperature drift.
APPLICATIONS
Impact and shock detection
Asset health assessment
Portable Internet of Things (IoT) edge nodes
Concussion and head trauma detection
The ADXL373 provides 12-bit output data at 200 mg/LSB scale
factor. The user can access configuration and data registers via
the serial peripheral interface (SPI) or I2C protocol. The ADXL373
operates over a wide supply voltage range and is available in a
3.00 mm × 3.25 mm × 1.06 mm package.
In this data sheet, multifunction pin names may be referenced
by their relevant function only.
FUNCTIONAL BLOCK DIAGRAM
V
V
S
DD I/O
4-POLE
ADXL373
AXIS ANITALIASING
DEMODS
FILTERS
INT1
INT2
MOSI
MISO
DIGITAL,
FIFO,
AND
12-BIT
ADC
3-AXIS
SENSOR
SPI
CS
SCLK
GND
Figure 1.
Rev. A
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www.analog.com
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