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ADXL362BCCZ-RL7 Datasheet(Arkusz danych) 1 Page - Analog Devices

Numer części ADXL362BCCZ-RL7
Szczegółowy opis  Micropower, 3-Axis, 2g/4g/8g Digital Output MEMS Accelerometer
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Micropower, 3-Axis, ±2 g/±4 g/±8 g
Digital Output MEMS Accelerometer
Data Sheet
ADXL362
Rev. B
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rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
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FEATURES
Ultralow power
Power can be derived from coin cell battery
1.8 µA @ 100 Hz ODR, 2.0 V supply
3.0 µA @ 400 Hz ODR, 2.0 V supply
270 nA motion activated wake-up mode
10 nA standby current
High resolution: 1 mg/LSB
Built-in features for system-level power savings:
Adjustable threshold sleep/wake modes for motion
activation
Autonomous interrupt processing, without need for
microcontroller intervention, to allow the rest of the
system to be turned off completely
Deep embedded FIFO minimizes host processor load
Awake state output enables implementation of
standalone, motion activated switch
Low noise down to 175 µg/√Hz
Wide supply and I/O voltage ranges: 1.6 V to 3.5 V
Operates off 1.8 V to 3.3 V 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 switches
Wireless sensors
Motion enabled metering devices
GENERAL DESCRIPTION
The ADXL362 is an ultralow power, 3-axis MEMS accelerometer
that consumes less than 2 µA at a 100 Hz output data rate and
270 nA when 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 full bandwidth of the sensor 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 normal 550 µg/√Hz of the ADXL362 is desired,
either of two lower noise modes (down to 175 µg/√Hz typical)
can be selected at minimal increase in supply current.
In addition to its ultralow 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 wake-up operation that can run
as low as 270 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 3.5 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
VS
VDDI/O
GND
3-AXIS
MEMS
SENSOR
TEMPERATURE
SENSOR
AXIS
DEMODULATORS
ANTIALIASING
FILTERS
ADXL362
12-BIT
ADC
DIGITAL
LOGIC,
FIFO,
AND
SPI
INT1
INT2
MOSI
MISO
CS
SCLK
Figure 1.




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