Datasheet ADXL362 (Analog Devices)

Micropower, 3-Axis, ±2 g /±4 g /±8 g Digital Output MEMS Accelerometer Data Sheet ADXL362 FEATURES GENERAL DESCRIPTION Ultralow power
The ADXL362 is an ultralow power, 3-axis MEMS accelerometer
Power can be derived from coin cell battery
that consumes less than 2 µA at a 100 Hz output data rate and
1.8 µA at 100 Hz ODR, 2.0 V supply
270 nA when in motion triggered wake-up mode. Unlike
3.0 µA at 400 Hz ODR, 2.0 V supply
accelerometers that use power duty cycling to achieve low power
270 nA motion activated wake-up mode
consumption, the ADXL362 does not alias input signals by
10 nA standby current
undersampling; it samples the full bandwidth of the sensor at all
High resolution: 1 mg /LSB
data rates.
Built-in features for system-level power savings:
The ADXL362 always provides 12-bit output resolution; 8-bit
Adjustable threshold sleep/wake modes for motion
formatted data is also provided for more efficient single-byte
activation
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 is desired,
Deep embedded FIFO minimizes host processor load
either of two lower noise modes (down to 175 µg/√Hz typical)
Awake state output enables implementation of
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
Wide supply and I/O voltage ranges: 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 rails
It includes a deep multimode output FIFO, a built-in micropower
Acceleration sample synchronization via external trigger
temperature sensor, and several activity detection modes including
On-chip temperature sensor
adjustable threshold sleep and wake-up operation that can run
SPI digital interface
as low as 270 nA at a 6 Hz (approximate) measurement rate. A
Measurement ranges selectable via SPI command
pin output is provided to directly control an external switch when
Small and thin 3 mm × 3.25 mm × 1.06 mm package
activity is detected, if desired. In addition, the ADXL362 has
APPLICATIONS
provisions for external control of sampling time and/or an external clock.
Hearing aids
The ADXL362 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 is available in a 3 mm ×
Wireless sensors
3.25 mm × 1.06 mm package.
Motion enabled metering devices FUNCTIONAL BLOCK DIAGRAM VS VDDI/O INT1 3-AXIS INT2 MEMS 12-BIT DIGITAL SENSOR MOSI ADC LOGIC, FIFO, MISO AND SPI CS SCLK AXIS ANTIALIASING DEMODULATORS FILTERS TEMPERATURE ADXL362 SENSOR
001
GND
10776- Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE PACKAGE INFORMATION RECOMMENDED SOLDERING PROFILE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION MECHANICAL DEVICE OPERATION OPERATING MODES Measurement Mode Wake-Up Mode Standby SELECTABLE MEASUREMENT RANGES SELECTABLE OUTPUT DATA RATES Antialiasing POWER/NOISE TRADEOFF POWER SAVINGS FEATURES ULTRALOW POWER CONSUMPTION IN ALL MODES MOTION DETECTION Activity Detection Referenced and Absolute Configurations Fewer False Positives Inactivity Detection Linking Activity and Inactivity Detection Default Mode Linked Mode Loop Mode Autosleep Using the AWAKE Bit FIFO System Level Power Savings Data Recording/Event Context COMMUNICATIONS SPI Instructions Bus Keepers MSB Registers ADDITIONAL FEATURES FREE FALL DETECTION EXTERNAL CLOCK SYNCHRONIZED DATA SAMPLING SELF TEST USER REGISTER PROTECTION TEMPERATURE SENSOR SERIAL COMMUNICATIONS SPI COMMANDS Read and Write Register Commands Read FIFO Command MULTIBYTE TRANSFERS Register Read/Write Auto-Increment INVALID ADDRESSES AND ADDRESS FOLDING LATENCY RESTRICTIONS INVALID COMMANDS REGISTER MAP REGISTER DETAILS DEVICE ID REGISTER DEVICE ID: 0x1D REGISTER PART ID: 0xF2 REGISTER SILICON REVISION ID REGISTER X-AXIS DATA (8 MSB) REGISTER Y-AXIS DATA (8 MSB) REGISTER Z-AXIS DATA (8 MSB) REGISTER STATUS REGISTER FIFO ENTRIES REGISTERS X-AXIS DATA REGISTERS Y-AXIS DATA REGISTERS Z-AXIS DATA REGISTERS TEMPERATURE DATA REGISTERS SOFT RESET REGISTER ACTIVITY THRESHOLD REGISTERS ACTIVITY TIME REGISTER INACTIVITY THRESHOLD REGISTERS INACTIVITY TIME REGISTERS ACTIVITY/INACTIVITY CONTROL REGISTER FIFO CONTROL REGISTER FIFO SAMPLES REGISTER INT1/INT2 FUNCTION MAP REGISTERS FILTER CONTROL REGISTER POWER CONTROL REGISTER SELF TEST REGISTER APPLICATIONS INFORMATION APPLICATION EXAMPLES Device Configuration Autonomous Motion Switch Start-up Routine Using External Timing Triggers Example: Implementing Free Fall Detection Start-up Routine POWER Power Supply Decoupling Power Supply Requirements FIFO MODES FIFO Disabled Oldest Saved Mode Stream Mode Triggered Mode FIFO Configuration FIFO Interrupts Retrieving Data from FIFO INTERRUPTS Interrupt Pins Alternate Functions of Interrupt Pins Activity and Inactivity Interrupts Data Ready Interrupt Using FIFO Interrupts FIFO Watermark FIFO Ready Overrun USING SYNCHRONIZED DATA SAMPLING USING AN EXTERNAL CLOCK USING SELF TEST OPERATION AT VOLTAGES OTHER THAN 2.0 V MECHANICAL CONSIDERATIONS FOR MOUNTING AXES OF ACCELERATION SENSITIVITY LAYOUT AND DESIGN RECOMMENDATIONS OUTLINE DIMENSIONS ORDERING GUIDE