ADXL362 Datasheet, PDF (1/40 Pages) Analog Devices – Micropower Three-Axis ±2g/±4g/±8g

Preliminary Technical Data
Micropower Three-Axis ±2g/±4g/±8g
Digital-Output MEMS Accelerometer
ADXL362
FEATURES
Ultra low power
Power can be derived from coin cell battery
1.8 µA @ 100 Hz ODR, 2.0V supply
3.0 µA @ 400 Hz ODR, 2.0V supply
300 nA motion-activated Wake-up Mode
10nA Standby Current
Built-in features for system-level power savings:
Adjustable-threshold sleep/wake modes for motion
activation
Autonomous interrupt processing without need for
microcontroller intervention, so the rest of the system
can be turned off completely
Deep embedded FIFO minimizes host processor load
Awake state output enables implementation of
standalone motion-activated switch
High resolution of 1 mg/LSB
Low noise down to 175 µg/√Hz
Wide supply and I/O voltage ranges: 1.6 V to 3.6 V
Operates off 1.8V to 3.3V rails
Acceleration sample synchronization via external trigger
On-chip temperature sensor
SPI digital interface
Measurement ranges selectable via SPI command
Small and thin 3 mm × 3.25 mm × 1.06 mm package
APPLICATIONS
Hearing aids
Home healthcare devices
Motion-enabled power save switch
Wireless sensors
Motion-enabled metering devices
GENERAL DESCRIPTION
The ADXL362 is an ultra-low power 3-axis MEMS
accelerometer that consumes less than 2 µA at a 100 Hz output
data rate, and 300 nA in motion-triggered Wake-Up Mode.
Unlike accelerometers that use power duty cycling to achieve
low power consumption, the ADXL362 does not alias input
signals by undersampling; it samples the sensor’s full bandwidth
at all data rates.
The ADXL362 always provides 12-bit output resolution; 8-bit
formatted data is also provided for more efficient single-byte
transfers when a lower resolution is sufficient. Measurement
ranges of ±2 g, ±4 g, and ±8 g are available, with a resolution of
1 mg/LSB on the ±2 g range. For applications where a noise level
lower than the ADXL362’s normal 550 µg/√Hz is desired, either
of two lower noise modes (down to 175 µg/√Hz typ) may be
selected at minimal increase in supply current.
In addition to its ultra-low power consumption, the ADXL362
has many features to enable true system-level power reduction.
It includes a deep multimode output FIFO, a built-in micropower
temperature sensor, and several activity detection modes including
adjustable-threshold sleep and wakeup operation that can run
as low as 300 nA at a 6 Hz (approximate) measurement rate. A
pin output is provided to directly control an external switch
when activity is detected if desired. In addition, the ADXL362
has provisions for external control of sampling time and/or an
external clock.
The ADXL362 operates on a wide 1.6 V to 3.6 V supply range,
and can interface, if necessary, to a host operating on a separate,
lower supply voltage. The ADXL362 is available in a 3 mm ×
3.25 mm × 1.06 mm package.
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
Rev. PrB
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