Datasheet ADXL313 (Analog Devices)

3-Axis, ±0.5 g /±1 g /±2 g /±4 g Digital Accelerometer Data Sheet ADXL313 FEATURES GENERAL DESCRIPTION Ultralow power (scales automatically with data rate)
The ADXL313 is a small, thin, low power, 3-axis accelerometer
As low as 30 µA in measurement mode (VS = 3.3 V)
with high resolution (13-bit) measurement up to ±4 g. Digital
As low as 0.1 µA in standby mode (VS = 3.3 V)
output data is formatted as 16-bit twos complement and is
Low noise performance
accessible through either a serial port interface (SPI) (3-wire or
150 μg /√Hz typical for X- and Y-axes
4-wire) or I2C digital interface.
250 μg /√Hz typical for the Z-axis
The ADXL313 is well suited for car alarm or black box applications.
Embedded, patent pending FIFO technology minimizes host
It measures the static acceleration of gravity in tilt-sensing applica-
processor load
tions, as well as dynamic acceleration resulting from motion or
User-selectable resolution
shock. Its high resolution (1024 LSB/g) and low noise (150 μg/√Hz)
Fixed 10-bit resolution for any g range
enable resolution of inclination changes of as little as 0.1°. A built-
Fixed 1024 LSB/g sensitivity for any g range
in FIFO facilitates using oversampling techniques to improve
Resolution scales from 10-bit at ±0.5 g to 13-bit at ±4 g
resolution to as little as 0.025° of inclination.
Built-in motion detection functions for activity/inactivity monitoring
Several built-in sensing functions are provided. Activity and
Supply and I/O voltage range: 2.0 V to 3.6 V
inactivity sensing detects the presence or absence of motion and
SPI (3-wire and 4-wire) and I2C digital interfaces
whether the acceleration on any axis exceeds a user-set level.
Flexible interrupt modes mappable to two interrupt pins
These functions can be mapped to interrupt output pins. An
Measurement range selectable via serial command
integrated 32-level FIFO can be used to store data to minimize
Bandwidth selectable via serial command
host processor intervention, resulting in reduced system power
Wide temperature range (−40°C to +105°C)
consumption.
10,000 g shock survival
Low power modes enable intelligent motion-based power
Pb free/RoHS compliant
management with threshold sensing and active acceleration
Small and thin: 5 mm × 5 mm × 1.45 mm LFCSP package
measurement at extremely low power dissipation.
Qualified for automotive applications
The ADXL313 is supplied in a small, thin 5 mm × 5 mm ×
APPLICATIONS
1.45 mm, 32-lead LFCSP package and is pin compatible with
Car alarms
the ADXL312 accelerometer device.
Hill start aid (HSA) systems Electronic parking brakes Data recorders (black boxes) FUNCTIONAL BLOCK DIAGRAM VS VDD I/O ADXL313 POWER MANAGEMENT CONTROL INT1 SENSE ADC DIGITAL AND ELECTRONICS FILTER INTERRUPT 3-AXIS LOGIC INT2 SENSOR SDA/SDI/SDIO 32-LEVEL SERIAL I/O SDO/ALT FIFO ADDRESS SCL/SCLK
001
GND CS
1469- 1 Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION POWER SEQUENCING POWER SAVINGS Power Modes Autosleep Mode Standby Mode SERIAL COMMUNICATIONS SPI I2C INTERRUPTS DATA_READY Activity Inactivity Watermark Overrun FIFO Bypass Mode FIFO Mode Stream Mode Trigger Mode Retrieving Data from FIFO SELF TEST REGISTER MAP REGISTER DEFINITIONS Register 0x00—DEVID_0 (Read Only) Register 0x01—DEVID_1 (Read Only) Register 0x02—PARTID (Read Only) Register 0x03—REVID (Read Only) Register 0x04—XID (Read Only) Register 0x18—SOFT_RESET (Read/Write) Register 0x1E—OFSX (Read/Write), Register 0x1F—OFSY (Read/Write),Register 0x20—OFSZ (Read/Write) Register 0x24—THRESH_ACT (Read/Write) Register 0x25—THRESH_INACT (Read/Write) Register 0x26—TIME_INACT (Read/Write) Register 0x27—ACT_INACT_CTL (Read/Write) ACT_AC/DC and INACT_AC/DC Bits ACT_x and INACT_x Bits Register 0x2C—BW_RATE (Read/Write) LOW_POWER Bit Rate Bits Register 0x2D—POWER_CTL (Read/Write) I2C_Disable Bit Link Bit AUTO_SLEEP Bit Measure Bit Sleep Bit Wake-Up Bits Register 0x2E—INT_ENABLE (Read/Write) Register 0x2F—INT_MAP (Read/Write) Register 0x30—INT_SOURCE (Read Only) Register 0x31—DATA_FORMAT (Read/Write) SELF_TEST Bit SPI Bit INT_INVERT Bit FULL_RES Bit Justify Bit Range Bits Register 0x32 and Register 0x33—DATA_X0, DATA_X1 (Read Only), Register 0x34 and Register 0x35—DATA_Y0, DATA_Y1 (Read Only), Register 0x36 and Register 0x37—DATA_Z0, DATA_Z1 (Read Only) Register 0x38—FIFO_CTL (Read/Write) FIFO_MODE Bits Trigger Bit Samples Bits 0x39—FIFO_STATUS (Read Only) FIFO_TRIG Bit Entries Bits APPLICATIONS INFORMATION POWER SUPPLY DECOUPLING MECHANICAL CONSIDERATIONS FOR MOUNTING THRESHOLD LINK MODE SLEEP MODE vs. LOW POWER MODE USING SELF TEST 3200 Hz AND 1600 Hz ODR DATA FORMATTING AXES OF ACCELERATION SENSITIVITY SOLDER PROFILE OUTLINE DIMENSIONS ORDERING GUIDE AUTOMOTIVE PRODUCTS