Datasheet ADXL362 (Analog Devices)

Micropower, 3-Axis, ±2 g /±4 g /±8 g , Digital Output MEMS Accelerometer ADI Confidential ADXL362-MI FEATURES GENERAL DESCRIPTION Ultralow power
The ADXL362-MI is an ultralow power, 3-axis MEMS
Power can be derived from coin cell battery
accelerometer that consumes less than 2 µA at a 100 Hz
1.8 µA at 100 Hz ODR, 2.0 V supply
output data rate (ODR) and 270 nA when in motion triggered
3.0 µA at 400 Hz ODR, 2.0 V supply
wake-up mode. Unlike accelerometers that use power duty
270 nA, motion activated, wake-up mode
cycling to achieve low power consumption, the ADXL362-MI
10 nA standby supply current, 2.0 V supply
does not alias input signals by undersampling; it samples the
High resolution, sensitivity at XOUT, YOUT, ZOUT: 1 mg /LSB
ful bandwidth of the sensor at al data rates.
Built in features for system level power savings
The ADXL362-MI always provides 12-bit output resolution;
Adjustable threshold sleep/wake modes for motion
8-bit formatted data is also provided for more efficient single-
activation
byte transfers when a lower resolution is sufficient. Measurement
Autonomous interrupt processing, without need for
ranges of ±2 g, ±4 g, and ±8 g are available, with a resolution of
microcontroller intervention, to allow the rest of the
1 mg/LSB on the ±2 g range. For applications where a noise level
system to be turned off completely
lower than the normal 550 µg/√Hz of the ADXL362-MI is
Deep embedded FIFO minimizes host processor load
desired, either of two lower noise modes (down to 175 µg/√Hz
Awake state output enables implementation of
typical) can be selected at minimal increase in supply current.
standalone, motion activated switch Low noise down to 175 µg /√Hz
In addition to its ultralow power consumption, the ADXL362-MI
Wide operating voltage range: 1.6 V to 3.5 V
has many features to enable true system level power reduction.
Operates off 1.8 V to 3.3 V batteries
It includes a deep multimode output, first in, first out (FIFO),
Special, high reliability manufacturing flow
a built in micropower temperature sensor, and several activity
Acceleration sample synchronization via external trigger
detection modes including adjustable threshold sleep and wake-up
On-chip temperature sensor
operation that can run as low as 270 nA at a 6 Hz (approximate)
SPI digital interface
measurement rate. A pin output is provided to directly control
Measurement ranges selectable via SPI command
an external switch when activity is detected, if desired. In addition,
Small and thin 3 mm × 3.25 mm × 1.06 mm package
the ADXL362-MI has provisions for external control of sampling
APPLICATIONS
time and/or an external clock.
Hearing aids
The ADXL362-MI operates on a wide 1.6 V to 3.5 V supply range,
Home healthcare devices
and can interface, if necessary, to a host operating on a separate,
Motion enabled power save switches
lower supply voltage. The ADXL362-MI is processed through a
Wireless sensors
special, high reliability manufacturing flow involving additional
Motion enabled metering devices
process, test, and quality controls to meet the quality and reliability requirements of implantable and other Class III medical devices. The ADXL362-MI is available in a 3 mm × 3.25 mm × 1.06 mm package.
FUNCTIONAL BLOCK DIAGRAM VS VDD I/O ADXL362-MI INT1 3-AXIS INT2 MEMS 12-BIT DIGITAL SENSOR MOSI ADC LOGIC, FIFO, MISO AND SPI CS SCLK TEMPERATURE AXIS ANTIALIASING SENSOR DEMODULATORS FILTERS
001
GND
16191- Figure 1. For more information on the ADXL362-MI, contact Analog Devices, Inc., at healthcare-support@analog.com.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM