Datasheet ADXL372 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Micropower, 3-Axis, ±200 g Digital Output, MEMS |
| Pages / Page | 57 / 3 — ADXL372. Data Sheet. TABLE OF CONTENTS |
| Revision | B |
| File Format / Size | PDF / 980 Kb |
| Document Language | English |
ADXL372. Data Sheet. TABLE OF CONTENTS
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ADXL372 Data Sheet TABLE OF CONTENTS
Features .. 1 Multibyte Transfers .. 26 Applications ... 1 Invalid Addresses and Address Folding .. 27 General Description ... 1 Register Map ... 30 Functional Block Diagram .. 1 Register Details ... 32 Revision History ... 3 Analog Devices ID Register .. 32 Specifications ... 4 Analog Devices MEMS ID Register ... 32 Absolute Maximum Ratings .. 6 Device ID Register ... 32 Thermal Resistance .. 6 Product Revision ID Register ... 32 Recommended Soldering Profile ... 6 Status Register ... 33 ESD Caution .. 6 Activity Status Register .. 33 Pin Configuration and Function Descriptions ... 7 FIFO Entries Register, MSB .. 34 Typical Performance Characteristics ... 8 FIFO Entries Register, LSB .. 34 Theory of Operation .. 13 X-Axis Data Register, MSB ... 34 Mechanical Device Operation .. 13 X-Axis Data Register, LSB ... 34 Operating Modes .. 13 Y-Axis Data Register, MSB .. 35 Bandwidth ... 13 Y-Axis Data Register, LSB ... 35 Power/Noise Trade-Off .. 14 Z-Axis Data Register, MSB ... 35 Power Savings.. 15 Z-Axis Data Register, LSB ... 35 Autonomous Event Detection ... 16 Highest Peak Data Registers ... 36 Activity and Inactivity.. 16 X-Axis Highest Peak Data Register, MSB ... 36 Motion Warning ... 18 X-Axis Highest Peak Data Register, LSB ... 36 Impact Detection Features .. 19 Y-Axis Highest Peak Data Register, MSB .. 36 Wide Bandwidth ... 19 Y-Axis Highest Peak Data Register, LSB ... 37 Instant On Impact Detection .. 19 Z-Axis Highest Peak Data Register, MSB ... 37 Capturing Impact Events ... 19 Z-Axis Highest Peak Data Register, LSB ... 37 FIFO ... 20 Offset Trim Registers ... 38 Benefits of the FIFO ... 20 X-Axis Offset Trim Register, LSB ... 38 Using the FIFO ... 20 Y-Axis Offset Trim Register, LSB ... 38 Retrieving Data from FIFO ... 21 Z-Axis Offset Trim Register, LSB ... 38 Interrupts ... 22 X-Axis Activity Threshold Register, MSB ... 39 Interrupt Pins .. 22 X-Axis of Activity Threshold Register, LSB .. 39 Types of Interrupts ... 22 Y-Axis Activity Threshold Register, MSB ... 39 Additional Features .. 24 Y-Axis of Activity Threshold Register, LSB .. 40 Using an External Clock .. 24 Z-Axis Activity Threshold Register, MSB ... 40 Synchronized Data Sampling .. 24 Z-Axis of Activity Threshold Register, LSB .. 40 Self Test .. 24 Activity Time Register ... 41 User Register Protection .. 25 X-Axis Inactivity Threshold Register, MSB .. 41 User Offset Trims ... 25 X-Axis of Inactivity Threshold Register, LSB ... 42 Serial Communications ... 26 Y-Axis Inactivity Threshold Register, MSB .. 42 Serial Interface .. 26 Y-Axis of Inactivity Threshold Register, LSB ... 43 Rev. 0 | Page 2 of 56 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE RECOMMENDED SOLDERING PROFILE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION MECHANICAL DEVICE OPERATION OPERATING MODES Measurement Mode Instant On Mode Wake-Up Mode Standby BANDWIDTH Low-Pass Antialiasing Filter High-Pass Filter Filter Settling Time Selectable ODR POWER/NOISE TRADE-OFF POWER SAVINGS AUTONOMOUS EVENT DETECTION ACTIVITY AND INACTIVITY Low-Pass Activity Detect Filter Activity Detection Referenced and Absolute Configurations Activity Timer Activity Detection in Wake-Up Mode Inactivity Detection Referenced and Absolute Configurations Inactivity Timer Linking Activity and Inactivity Detection Default Mode Linked Mode Loop Mode Autosleep Using the AWAKE Bit MOTION WARNING IMPACT DETECTION FEATURES WIDE BANDWIDTH INSTANT ON IMPACT DETECTION CAPTURING IMPACT EVENTS FIFO BENEFITS OF THE FIFO System Level Power Savings Data Recording/Event Context USING THE FIFO FIFO Disabled Oldest Saved Mode (First N) Stream Mode (Last N) Triggered Mode RETRIEVING DATA FROM FIFO INTERRUPTS INTERRUPT PINS Alternate Functions TYPES OF INTERRUPTS Activity and Inactivity Interrupts Data Ready Interrupt FIFO Interrupts FIFO Watermark FIFO Ready Overrun ADDITIONAL FEATURES USING AN EXTERNAL CLOCK SYNCHRONIZED DATA SAMPLING SELF TEST Self Test Procedure USER REGISTER PROTECTION USER OFFSET TRIMS SERIAL COMMUNICATIONS SERIAL INTERFACE SPI Protocol I2C Protocol MULTIBYTE TRANSFERS INVALID ADDRESSES AND ADDRESS FOLDING SPI Timing Diagrams I2C Timing Diagrams REGISTER MAP REGISTER DETAILS ANALOG DEVICES ID REGISTER ANALOG DEVICES MEMS ID REGISTER DEVICE ID REGISTER PRODUCT REVISION ID REGISTER STATUS REGISTER ACTIVITY STATUS REGISTER FIFO ENTRIES REGISTER, MSB FIFO ENTRIES REGISTER, LSB X-AXIS DATA REGISTER, MSB X-AXIS DATA REGISTER, LSB Y-AXIS DATA REGISTER, MSB Y-AXIS DATA REGISTER, LSB Z-AXIS DATA REGISTER, MSB Z-AXIS DATA REGISTER, LSB HIGHEST PEAK DATA REGISTERS X-AXIS HIGHEST PEAK DATA REGISTER, MSB X-AXIS HIGHEST PEAK DATA REGISTER, LSB Y-AXIS HIGHEST PEAK DATA REGISTER, MSB Y-AXIS HIGHEST PEAK DATA REGISTER, LSB Z-AXIS HIGHEST PEAK DATA REGISTER, MSB Z-AXIS HIGHEST PEAK DATA REGISTER, LSB OFFSET TRIM REGISTERS X-AXIS OFFSET TRIM REGISTER, LSB Y-AXIS OFFSET TRIM REGISTER, LSB Z-AXIS OFFSET TRIM REGISTER, LSB X-AXIS ACTIVITY THRESHOLD REGISTER, MSB X-AXIS OF ACTIVITY THRESHOLD REGISTER, LSB Y-AXIS ACTIVITY THRESHOLD REGISTER, MSB Y-AXIS OF ACTIVITY THRESHOLD REGISTER, LSB Z-AXIS ACTIVITY THRESHOLD REGISTER, MSB Z-AXIS OF ACTIVITY THRESHOLD REGISTER, LSB ACTIVITY TIME REGISTER X-AXIS INACTIVITY THRESHOLD REGISTER, MSB X-AXIS OF INACTIVITY THRESHOLD REGISTER, LSB Y-AXIS INACTIVITY THRESHOLD REGISTER, MSB Y-AXIS OF INACTIVITY THRESHOLD REGISTER, LSB Z-AXIS INACTIVITY THRESHOLD REGISTER, MSB Z-AXIS OF INACTIVITY THRESHOLD REGISTER, LSB INACTIVITY TIME REGISTERS INACTIVITY TIMER REGISTER, MSB INACTIVITY TIMER REGISTER, LSB X-AXIS MOTION WARNING THRESHOLD REGISTER, MSB X-AXIS OF MOTION WARNING NOTIFICATION REGISTER, LSB Y-AXIS MOTION WARNING NOTIFICATION THRESHOLD REGISTER, MSB Y-AXIS OF MOTION WARNING NOTIFICATION REGISTER, LSB Z-AXIS MOTION WARNING NOTIFICATION THRESHOLD REGISTER, MSB Z-AXIS MOTION WARNING NOTIFICATION REGISTER, LSB HIGH-PASS FILTER SETTINGS REGISTER FIFO SAMPLES REGISTER FIFO CONTROL REGISTER INTERRUPT PIN FUNCTION MAP REGISTERS INT2 FUNCTION MAP REGISTER EXTERNAL TIMING CONTROL REGISTER MEASUREMENT CONTROL REGISTER POWER CONTROL REGISTER SELF TEST REGISTER RESET (CLEARS) REGISTER, PART IN STANDBY MODE FIFO ACCESS REGISTER APPLICATIONS INFORMATION APPLICATION EXAMPLES Power Supply Decoupling Using External Timing Triggers OPERATION AT VOLTAGES OTHER THAN 2.5 V OPERATION AT TEMPERATURES OTHER THAN AMBIENT MECHANICAL CONSIDERATIONS FOR MOUNTING AXES OF ACCELERATION SENSITIVITY LAYOUT AND DESIGN RECOMMENDATIONS OUTLINE DIMENSIONS ORDERING GUIDE
ADXL372 Data Sheet TABLE OF CONTENTS
Features .. 1 Multibyte Transfers .. 26 Applications ... 1 Invalid Addresses and Address Folding .. 27 General Description ... 1 Register Map ... 30 Functional Block Diagram .. 1 Register Details ... 32 Revision History ... 3 Analog Devices ID Register .. 32 Specifications ... 4 Analog Devices MEMS ID Register ... 32 Absolute Maximum Ratings .. 6 Device ID Register ... 32 Thermal Resistance .. 6 Product Revision ID Register ... 32 Recommended Soldering Profile ... 6 Status Register ... 33 ESD Caution .. 6 Activity Status Register .. 33 Pin Configuration and Function Descriptions ... 7 FIFO Entries Register, MSB .. 34 Typical Performance Characteristics ... 8 FIFO Entries Register, LSB .. 34 Theory of Operation .. 13 X-Axis Data Register, MSB ... 34 Mechanical Device Operation .. 13 X-Axis Data Register, LSB ... 34 Operating Modes .. 13 Y-Axis Data Register, MSB .. 35 Bandwidth ... 13 Y-Axis Data Register, LSB ... 35 Power/Noise Trade-Off .. 14 Z-Axis Data Register, MSB ... 35 Power Savings.. 15 Z-Axis Data Register, LSB ... 35 Autonomous Event Detection ... 16 Highest Peak Data Registers ... 36 Activity and Inactivity.. 16 X-Axis Highest Peak Data Register, MSB ... 36 Motion Warning ... 18 X-Axis Highest Peak Data Register, LSB ... 36 Impact Detection Features .. 19 Y-Axis Highest Peak Data Register, MSB .. 36 Wide Bandwidth ... 19 Y-Axis Highest Peak Data Register, LSB ... 37 Instant On Impact Detection .. 19 Z-Axis Highest Peak Data Register, MSB ... 37 Capturing Impact Events ... 19 Z-Axis Highest Peak Data Register, LSB ... 37 FIFO ... 20 Offset Trim Registers ... 38 Benefits of the FIFO ... 20 X-Axis Offset Trim Register, LSB ... 38 Using the FIFO ... 20 Y-Axis Offset Trim Register, LSB ... 38 Retrieving Data from FIFO ... 21 Z-Axis Offset Trim Register, LSB ... 38 Interrupts ... 22 X-Axis Activity Threshold Register, MSB ... 39 Interrupt Pins .. 22 X-Axis of Activity Threshold Register, LSB .. 39 Types of Interrupts ... 22 Y-Axis Activity Threshold Register, MSB ... 39 Additional Features .. 24 Y-Axis of Activity Threshold Register, LSB .. 40 Using an External Clock .. 24 Z-Axis Activity Threshold Register, MSB ... 40 Synchronized Data Sampling .. 24 Z-Axis of Activity Threshold Register, LSB .. 40 Self Test .. 24 Activity Time Register ... 41 User Register Protection .. 25 X-Axis Inactivity Threshold Register, MSB .. 41 User Offset Trims ... 25 X-Axis of Inactivity Threshold Register, LSB ... 42 Serial Communications ... 26 Y-Axis Inactivity Threshold Register, MSB .. 42 Serial Interface .. 26 Y-Axis of Inactivity Threshold Register, LSB ... 43 Rev. 0 | Page 2 of 56 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE RECOMMENDED SOLDERING PROFILE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION MECHANICAL DEVICE OPERATION OPERATING MODES Measurement Mode Instant On Mode Wake-Up Mode Standby BANDWIDTH Low-Pass Antialiasing Filter High-Pass Filter Filter Settling Time Selectable ODR POWER/NOISE TRADE-OFF POWER SAVINGS AUTONOMOUS EVENT DETECTION ACTIVITY AND INACTIVITY Low-Pass Activity Detect Filter Activity Detection Referenced and Absolute Configurations Activity Timer Activity Detection in Wake-Up Mode Inactivity Detection Referenced and Absolute Configurations Inactivity Timer Linking Activity and Inactivity Detection Default Mode Linked Mode Loop Mode Autosleep Using the AWAKE Bit MOTION WARNING IMPACT DETECTION FEATURES WIDE BANDWIDTH INSTANT ON IMPACT DETECTION CAPTURING IMPACT EVENTS FIFO BENEFITS OF THE FIFO System Level Power Savings Data Recording/Event Context USING THE FIFO FIFO Disabled Oldest Saved Mode (First N) Stream Mode (Last N) Triggered Mode RETRIEVING DATA FROM FIFO INTERRUPTS INTERRUPT PINS Alternate Functions TYPES OF INTERRUPTS Activity and Inactivity Interrupts Data Ready Interrupt FIFO Interrupts FIFO Watermark FIFO Ready Overrun ADDITIONAL FEATURES USING AN EXTERNAL CLOCK SYNCHRONIZED DATA SAMPLING SELF TEST Self Test Procedure USER REGISTER PROTECTION USER OFFSET TRIMS SERIAL COMMUNICATIONS SERIAL INTERFACE SPI Protocol I2C Protocol MULTIBYTE TRANSFERS INVALID ADDRESSES AND ADDRESS FOLDING SPI Timing Diagrams I2C Timing Diagrams REGISTER MAP REGISTER DETAILS ANALOG DEVICES ID REGISTER ANALOG DEVICES MEMS ID REGISTER DEVICE ID REGISTER PRODUCT REVISION ID REGISTER STATUS REGISTER ACTIVITY STATUS REGISTER FIFO ENTRIES REGISTER, MSB FIFO ENTRIES REGISTER, LSB X-AXIS DATA REGISTER, MSB X-AXIS DATA REGISTER, LSB Y-AXIS DATA REGISTER, MSB Y-AXIS DATA REGISTER, LSB Z-AXIS DATA REGISTER, MSB Z-AXIS DATA REGISTER, LSB HIGHEST PEAK DATA REGISTERS X-AXIS HIGHEST PEAK DATA REGISTER, MSB X-AXIS HIGHEST PEAK DATA REGISTER, LSB Y-AXIS HIGHEST PEAK DATA REGISTER, MSB Y-AXIS HIGHEST PEAK DATA REGISTER, LSB Z-AXIS HIGHEST PEAK DATA REGISTER, MSB Z-AXIS HIGHEST PEAK DATA REGISTER, LSB OFFSET TRIM REGISTERS X-AXIS OFFSET TRIM REGISTER, LSB Y-AXIS OFFSET TRIM REGISTER, LSB Z-AXIS OFFSET TRIM REGISTER, LSB X-AXIS ACTIVITY THRESHOLD REGISTER, MSB X-AXIS OF ACTIVITY THRESHOLD REGISTER, LSB Y-AXIS ACTIVITY THRESHOLD REGISTER, MSB Y-AXIS OF ACTIVITY THRESHOLD REGISTER, LSB Z-AXIS ACTIVITY THRESHOLD REGISTER, MSB Z-AXIS OF ACTIVITY THRESHOLD REGISTER, LSB ACTIVITY TIME REGISTER X-AXIS INACTIVITY THRESHOLD REGISTER, MSB X-AXIS OF INACTIVITY THRESHOLD REGISTER, LSB Y-AXIS INACTIVITY THRESHOLD REGISTER, MSB Y-AXIS OF INACTIVITY THRESHOLD REGISTER, LSB Z-AXIS INACTIVITY THRESHOLD REGISTER, MSB Z-AXIS OF INACTIVITY THRESHOLD REGISTER, LSB INACTIVITY TIME REGISTERS INACTIVITY TIMER REGISTER, MSB INACTIVITY TIMER REGISTER, LSB X-AXIS MOTION WARNING THRESHOLD REGISTER, MSB X-AXIS OF MOTION WARNING NOTIFICATION REGISTER, LSB Y-AXIS MOTION WARNING NOTIFICATION THRESHOLD REGISTER, MSB Y-AXIS OF MOTION WARNING NOTIFICATION REGISTER, LSB Z-AXIS MOTION WARNING NOTIFICATION THRESHOLD REGISTER, MSB Z-AXIS MOTION WARNING NOTIFICATION REGISTER, LSB HIGH-PASS FILTER SETTINGS REGISTER FIFO SAMPLES REGISTER FIFO CONTROL REGISTER INTERRUPT PIN FUNCTION MAP REGISTERS INT2 FUNCTION MAP REGISTER EXTERNAL TIMING CONTROL REGISTER MEASUREMENT CONTROL REGISTER POWER CONTROL REGISTER SELF TEST REGISTER RESET (CLEARS) REGISTER, PART IN STANDBY MODE FIFO ACCESS REGISTER APPLICATIONS INFORMATION APPLICATION EXAMPLES Power Supply Decoupling Using External Timing Triggers OPERATION AT VOLTAGES OTHER THAN 2.5 V OPERATION AT TEMPERATURES OTHER THAN AMBIENT MECHANICAL CONSIDERATIONS FOR MOUNTING AXES OF ACCELERATION SENSITIVITY LAYOUT AND DESIGN RECOMMENDATIONS OUTLINE DIMENSIONS ORDERING GUIDE
