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Freescale Semiconductor

Data Sheet: Technical Data

An Energy Efficient Solution by Freescale

Document Number: MMA7660FC

Rev 8, 03/2012

3-Axis Orientation/Motion

Detection Sensor

C).

The MMA7660FC is a ±1.5 g 3-Axis Accelerometer with Digital Output

It is a very low power, low profile capacitive MEMS sensor featuring a

low pass filter, compensation for 0g offset and gain errors, and conversion to

6-bit digital values at a user configurable samples per second. The device can

be used for sensor data changes, product orientation, and gesture detection

through an interrupt pin (INT). The device is housed in a small 3mm x 3mm x

0.9mm DFN package.

Features

•

Digital Output (I

3mm x 3mm x 0.9mm DFN Package

Low Power Current Consumption: Off Mode: 0.4 µA,

Standby Mode: 2 µA, Active Mode: 47 µA at 1 ODR

Configurable Samples per Second from 1 to 120 samples a second.

Low Voltage Operation:

– Analog Voltage: 2.4 V - 3.6 V

– Digital Voltage: 1.71 V - 3.6 V

Auto-Wake/Sleep Feature for Low Power Consumption

Tilt Orientation Detection for Portrait/Landscape Capability

Gesture Detection Including Shake Detection and Tap Detection

Robust Design, High Shocks Survivability (10,000 g)

RoHS Compliant

Halogen Free

Environmentally Preferred Product

Low Cost

RESERVED

N/C

AVDD

AVSS

INT

MMA7660FC

MMA7660FC: XYZ-AXIS

ACCELEROMETER

±1.5 g

Bottom View

•

10 LEAD

DFN

CASE 2002-03

Top View

Typical Applications

•

Mobile Phone/ PMP/PDA: Orientation Detection (Portrait/Landscape),

Image Stability, Text Scroll, Motion Dialing, Tap to Mute

Laptop PC: Anti-Theft

Gaming: Motion Detection, Auto-Wake/Sleep For Low Power

Consumption

Digital Still Camera: Image Stability

N/C

RESERVED

DVDD

DVSS

SDA

SCL

Figure 1. Pin Connections

ORDERING INFORMATION

Part Number

MMA7660FCT

MMA7660FCR1

Temperature Range

–40 to +85°C

Package

DFN-10

Shipping

Tray

7” Tape & Reel

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

APPENDIX D - I

C AC CHARACTERISTICS ............................................................................................................................ 30

MMA7660FC

Sensors

Freescale Semiconductor

List of Tables

Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ESD And Latch-up Protection Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Modes Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Feature Summary Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Orientation Detection Logic of when Interrupt will Occur . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Auto-Wake/Sleep Truth Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

User Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

ASE/AWE Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Sleep Counter Timeout Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

C AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

MMA7660FC

Sensors

Freescale Semiconductor

List of Figures

C Connection to MCU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Simplified Accelerometer Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Simplified Transducer Physical Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

State Machine of Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Orientation Detection Logic in 3-Dimensional Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2-Wire Serial Interface Timing Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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

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

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

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

Single Byte Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Multiple Bytes Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Single Byte Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Multiple Bytes Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Package Footprint, PCB Land Pattern, and Stencil Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

PCB Land Pattern Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Product Orientation on Perpendicular Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Product Orientations Showing Direction for Each Axis in Composite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

MMA7660FC

Sensors

Freescale Semiconductor

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