AN4662 datasheet(2/43 Pages) STMICROELECTRONICS

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Contents

AN4662

Contents

Registers.......................................................................................... 6

Operating modes ............................................................................. 8

2.1

Power-down mode ............................................................................ 9

2.2

Active mode ...................................................................................... 9

2.3

Data stabilization time ....................................................................... 9

2.4

System bandwidth........................................................................... 10

2.5

Activity/Inactivity function ................................................................ 11

Startup sequence .......................................................................... 13

3.1

Reading acceleration data .............................................................. 13

3.1.1

Using the status register................................................................... 13

3.1.2

Using the data-ready (DRDY) signal ................................................ 14

3.1.3

Using the block data update (BDU) feature ..................................... 14

3.2

Understanding acceleration data..................................................... 14

3.2.1

Data alignment ................................................................................. 15

3.2.2

Examples of acceleration data ......................................................... 15

High-pass filter .............................................................................. 16

4.1

Filter configuration........................................................................... 16

4.1.1

Normal mode .................................................................................... 17

4.1.2

Reference signal for filtering............................................................. 17

Interrupt generation ...................................................................... 19

5.1

Interrupt pin configuration ............................................................... 19

Inertial interrupt ............................................................................. 21

6.1

Duration .......................................................................................... 22

6.1.1

Decrement function .......................................................................... 22

6.1.2

Wait function ..................................................................................... 23

6.2

Threshold ........................................................................................ 24

6.3

Free-fall and wake-up interrupts...................................................... 24

6.3.1

Inertial wake-up ................................................................................ 27

6.3.2

HP filter bypassed ............................................................................ 27

6.3.3

Using the HP filter............................................................................. 28

6.4

Free-fall detection ........................................................................... 29

6D/4D orientation detection .......................................................... 31

7.1

6D orientation detection .................................................................. 31

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