Datasheet ADXL363 (Analog Devices)

Micropower 3-Sensor Combination Including Acceleration and Temperature Data Sheet ADXL363 FEATURES GENERAL D ESCRIPTION Accelerometer, temperature sensor, and provision for 3rd
The ADXL363 is an ultralow power, three-sensor combination
analog sensor input
consisting of a 3-axis MEMS accelerometer, a temperature sensor,
All sensors sampled synchronously
and an on-board ADC input for synchronous conversion of an
Up to 400 Hz output data rate (ODR)
external signal. The entire system consumes less than 2 µA at a
Samples can be synchronized to external trigger
100 Hz output data rate and 270 nA when in motion triggered
Ultralow power
wake-up mode.
1.95 µA at 100 Hz ODR, 2.0 V supply, all sensors on
The ADXL363 communicates via a serial port interface (SPI)
270 nA at 6 Hz motion activated wake-up mode
and always provides 12-bit output resolution for al three
10 nA standby current
sensors.
12-bit resolution for all sensors Acceleration scale factor down to 1 mg /LSB
The ADXL363 accelerometer provides selectable measurement
Temperature scale factor: 0.065°C/LSB (average)
ranges of ±2 g, ±4 g, and ±8 g, with a resolution of 1 mg/LSB on
Built-in features for motion-based system level power savings
the ±2 g range. Unlike accelerometers that use power duty
Adjustable threshold sleep/wake modes for motion
cycling to achieve low power consumption, the ADXL363 does
activation
not alias input signals by undersampling; it samples the full
Autonomous interrupt processing, without need for
bandwidth of the sensor at al data rates.
microcontroller intervention, to allow the rest of the
The ADXL363 temperature sensor operates with a scale factor
system to be turned off completely
of 0.065°C (typical). Acceleration and temperature data can be
Deep embedded FIFO minimizes host processor load
stored in a 512-sample multimode FIFO buffer, allowing up to
Awake state output enables implementation of
13 sec of data to be stored.
standalone, motion activated switch Wide supply and I/O voltage ranges: 1.6 V to 3.5 V
In addition to the accelerometer and temperature sensor, the
Operates off 1.8 V to 3.3 V rails
ADXL363 also provides access to an internal ADC for
Power can be derived from coin cell battery
synchronous conversion of an additional analog input.
SPI digital interface
The ADXL363 operates on a wide 1.6 V to 3.5 V supply range,
Small and thin 3 mm × 3.25 mm × 1.06 mm package
and can interface, if necessary, to a host operating on a separate,
APPLICATIONS
lower supply voltage. The ADXL363 is available in a 3 mm × 3.25 mm × 1.06 mm package.
Home healthcare devices Wireless sensors Motion enabled metering devices FUNCTIONAL BLOCK DIAGRAM V V S DD I/O 3-AXIS INT1 MEMS SENSOR INT2 12-BIT DIGITAL MOSI ADC FIFO AND MISO SPI CS AXIS ANTIALIASING DEMODULATORS FILTERS SCLK TEMPERATURE SENSOR ADXL363
001
GND ADC_IN
1719- 1 Figure 1.
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Document Outline Features Applications General Description Functional Block Diagram Revision History Specifications ADXL363 Specifications Accelerometer Specifications Temperature Sensor Specifications 12-Bit ADC Specifications Absolute Maximum Ratings Thermal Resistance Recommended Soldering Profile ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Accelerometer Mechanical Device Operation Operating Modes Measurement Mode Wake-Up Mode Standby Selectable Measurement Ranges Selectable Output Data Rates Antialiasing Power/Noise Tradeoff Free Fall Detection ADC Analog Inputs Digital Output Temperature Sensor Power Savings Features Ultralow Power Consumption in All Modes, Operating All Sensors 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 External Clock Synchronized Data Sampling Self Test User Register Protection 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 Registers 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 ADC 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 Startup Routine Using External Timing Using an External Clock Using Synchronized Data Sampling How to Set Up Synchronized Data Sampling 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 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