ADXL346BCCZ

Preliminary Technical Data FEATURES 3-Axis, ±2 g/±4 g/±8 g/±16 g Ultralow Power Digital Accelerometer ADXL346 GENERAL DESCRIPTION The ADXL346 is a small, thin, ultralow power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface. The ADXL346 is well suited for mobile device applications. It measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution (4 mg/LSB) enables measurement of inclination changes less than 1.0°. Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion by comparing the acceleration on any axis with user-set thresholds. Tap sensing detects single and double taps in any direction. Freefall sensing detects if the device is falling. Orientation detection is capable of concurrent four- and six-position sensing and a user-selectable interrupt on orientation change for 2-D or 3-D applications. These functions can be mapped individually to either of two interrupt output pins. An integrated, patent pending memory management system with 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor activity and lower overall system power consumption. Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation. The ADXL346 is supplied in a small, thin, 3 mm × 3 mm × 0.95 mm, 16-lead, plastic package. Ultralow power: as low as 35 µA in measurement mode and 1 µA in standby mode at VS = 2.5 V (typical) Power consumption scales automatically with bandwidth User-selectable resolution Fixed 10-bit resolution Full resolution, where resolution increases with g range, up to 13-bit resolution at ±16 g (maintaining 4 mg/LSB scale factor in all g ranges) Patent pending, embedded memory management system with FIFO technology minimizes host processor load Single tap/double tap detection Activity/inactivity monitoring Free-fall detection Concurrent four- and six-position orientation detection Supply and I/O voltage range: 1.7 V to 2.75 V SPI (3- and 4-wire) and I2C digital interfaces Flexible interrupt modes mappable to either interrupt pin Measurement ranges selectable via serial command Bandwidth selectable via serial command Wide temperature range (−40°C to +85°C) 10,000 g shock survival Pb free/RoHS compliant Small and thin: 3 mm × 3 mm × 0.95 mm LGA package APPLICATIONS Handsets Medical instrumentation Gaming and pointing devices Industrial instrumentation Personal navigation devices Hard disk drive (HDD) protection FUNCTIONAL BLOCK DIAGRAM VS VDD I/O ADXL346 POWER MANAGEMENT 3-AXIS SENSOR SENSE ELECTRONICS ADC DIGITAL FILTER CONTROL AND INTERRUPT LOGIC INT1 INT2 32 LEVEL FIFO SDA/SDI/SDIO SERIAL I/O SDO/ALT ADDRESS SCL/SCLK 08167-001 GND CS Figure 1. Rev. PrC Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. See the last page for disclaimers. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. ADXL346 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 Thermal Resistance ...................................................................... 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ...................................................................... 10 Power Sequencing ...................................................................... 10 Power Savings.............................................................................. 10 Serial Communications ................................................................. 12 SPI................................................................................................. 12 I2C ................................................................................................. 14 Interrupts ..................................................................................... 16 FIFO ............................................................................................. 16 Preliminary Technical Data Self-Test ....................................................................................... 17 Register Map ................................................................................... 19 Register Definitions ................................................................... 20 Applications Information .............................................................. 25 Power Supply Decoupling ......................................................... 25 Mechanical Considerations for Mounting.............................. 25 Tap Detection.............................................................................. 25 Improved Tap Detection............................................................ 26 Tap Sign ....................................................................................... 26 Threshold .................................................................................... 27 Link Mode ................................................................................... 27 Sleep Mode vs. Low Power Mode............................................. 27 Using Self-Test ............................................................................ 27 Orientation Sensing ................................................................... 28 Axes of Acceleration Sensitivity ............................................... 29 Layout and Design Recommendations ................................... 30 Outline Dimensions ....................................................................... 31 Ordering Guide .......................................................................... 31 REVISION HISTORY 6/09—Revision PrC: Updated Specifications and functional descriptions of Orientation, Tap Sign and Improved Tap. 4/09—Revision PrB: Updated Absolute Maximum Ratings table to reflect correct values for the ADXL346. 3/09—Revision PrA: Initial Version Rev. PrC | Page 2 of 32 Preliminary Technical Data SPECIFICATIONS ADXL346 TA = 25°C, VS = 2.5 V, VDD I/O = 1.8 V, acceleration = 0 g, CS = 10 F tantalum, CIO = 0.1 F, ODR = 800 Hz, unless otherwise noted. Table 1. Specifications1 Parameter SENSOR INPUT Measurement Range Nonlinearity Inter-Axis Alignment Error Cross-Axis Sensitivity2 OUTPUT RESOLUTION All g Ranges ±2 g Range ±4 g Range ±8 g Range ±16 g Range SENSITIVITY Sensitivity at XOUT, YOUT, ZOUT Scale Factor at XOUT, YOUT, ZOUT Sensitivity at XOUT, YOUT, ZOUT Scale Factor at XOUT, YOUT, ZOUT Sensitivity at XOUT, YOUT, ZOUT Scale Factor at XOUT, YOUT, ZOUT Sensitivity at XOUT, YOUT, ZOUT Scale Factor at XOUT, YOUT, ZOUT Sensitivity Change Due to Temperature 0 g OFFSET 0 g Output for XOUT, YOUT, ZOUT 0 g Offset vs. Temperature for x-, y-, z-Axes NOISE x-, y-Axes z-Axis OUTPUT DATA RATE AND BANDWIDTH Output Data Rate (ODR)3 SELF-TEST4 Output Change in x-Axis Output Change in y-Axis Output Change in z-Axis POWER SUPPLY Operating Voltage Range (VS) Interface Voltage Range (VDD I/O) Supply Current Standby Mode Leakage Current Turn-On and Wake-Up Time5 TEMPERATURE Operating Temperature Range WEIGHT Device Weight 1 2 3 Test Conditions Each axis User selectable Percentage of full scale Min Typ ±2, ±4, ±8, ±16 ±0.5 ±0.1 ±1 10 10 11 12 13 Max Unit g % Degrees % Bits Bits Bits Bits Bits Each axis 10-bit resolution Full resolution Full resolution Full resolution Full resolution Each axis ±2 g, 10-bit or full resolution ±2 g, 10-bit or full resolution ±4 g, 10-bit resolution ±4 g, 10-bit resolution ±8 g, 10-bit resolution ±8 g, 10-bit resolution ±16 g, 10-bit resolution ±16 g, 10-bit resolution Each axis 230 3.5 115 7.1 57 14.1 29 28.6 256 3.9 128 7.8 64 15.6 32 31.2 ±0.01 282 4.3 141 8.7 71 17.5 35 34.5 LSB/g mg/LSB LSB/g mg/LSB LSB/g mg/LSB LSB/g mg/LSB %/°C mg mg/°C LSB rms LSB rms −150