Sensors

Freescale Semiconductor

2

MMA7660FC

Contents

DEFINITIONS ............................................................................................................................................................................... 5

ELECTRO STATIC DISCHARGE (ESD) ...................................................................................................................................... 7

PRINCIPLE OF OPERATION ...................................................................................................................................................... 9

MODES OF OPERATION .......................................................................................................................................................... 10

CONFIGURABLE SAMPLES PER SECONDS AND INTERRUPT SETTINGS ......................................................................... 11

POWER SAVING FEATURES ................................................................................................................................................... 11

TESTING THE LOGIC CHAIN ................................................................................................................................................... 11

FEATURES ................................................................................................................................................................................ 11

Tap Detection ...................................................................................................................................................................... 13

Shake Detection .................................................................................................................................................................. 13

Auto-Wake/Sleep ................................................................................................................................................................ 13

REGISTER DEFINITIONS ......................................................................................................................................................... 14

SERIAL INTERFACE ................................................................................................................................................................. 22

Serial-Addressing ................................................................................................................................................................ 22

Start and Stop Conditions ................................................................................................................................................... 22

Bit Transfer .......................................................................................................................................................................... 22

Acknowledge ....................................................................................................................................................................... 23

The Slave Address .............................................................................................................................................................. 23

Message Format for Writing MMA7660FC .......................................................................................................................... 23

Message Format for Reading MMA7660FC ........................................................................................................................ 24

APPENDIX A - PACKAGE REQUIREMENTS FOR MMA7660FC ............................................................................................. 25

Minimum Recommended Footprint for Surface Mounted Applications ............................................................................... 25

Soldering And Mounting Guidelines for the DFN Accelerometer Sensor to a PC Board .................................................... 25

Overview of Soldering Considerations ................................................................................................................................ 25

Halogen Content ................................................................................................................................................................. 25

PCB Mounting Recommendations ...................................................................................................................................... 25

APPENDIX B - SENSING DIRECTION ...................................................................................................................................... 27

APPENDIX C - MMA7660FC ACQUISITION CODE TABLE ..................................................................................................... 28