3-Axis Orientation/Motion Detection Sensor MMA7660FC - NXP

1 Document Number: MMA7660 FCRev 8, 03/2012 Freescale SemiconductorData Sheet: Technical DataAn Energy Efficient Solution by Freescale 2009-2012 Freescale Semiconductor, Inc. All rights Orientation/Motion Detection SensorThe MMA7660FC is a g 3-Axis Accelerometer with Digital Output (I2C). 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 DFN package. Features Digital Output (I2C) 3mm x 3mm x DFN Package Low Power current Consumption: Off Mode: A, Standby Mode: 2 A, Active Mode: 47 A at 1 ODR Configurable Samples per Second from 1 to 120 samples a second.

2 Low Voltage Operation: Analog Voltage: V - V Digital Voltage: V - 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 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 StabilityORDERING INFORMATIONPart NumberTemperature RangePackageShippingMMA7660 FCT 40 to +85 CDFN-10 TrayMMA7660 FCR1 40 to +85 CDFN-107 Tape & ReelN/CDVDDDVSSSDASCLRESERVEDN/CAVDDAVSS INT12345678910 Figure 1.

3 Pin ConnectionsRESERVED10 LEADDFNCASE 2002-03 MMA7660 FCMMA7660FC: XYZ-AXIS ACCELEROMETER gBottom ViewTop ViewSensorsFreescale Semiconductor2 MMA7660 FCContentsDEFINITIONS .. 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 .

4 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 - I2C AC CHARACTERISTICS .. 30 SensorsFreescale Semiconductor3 MMA7660 FCList of TablesPin 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.

5 12 Auto-Wake/Sleep Truth Table .. 13 User Register Summary .. 14 Modes .. 17 ASE/AWE Conditions .. 18 Sleep Counter Timeout Ranges .. 18I2C AC Characteristics .. 30 SensorsFreescale Semiconductor4 MMA7660 FCList of FiguresI2C 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 .. 122-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.

6 26 PCB Land Pattern Detail .. 26 Product Orientation on Perpendicular Axis .. 27 Product Orientations Showing Direction for Each Axis in Composite .. 27 SensorsFreescale Semiconductor5 MMA7660 FCDefinitionsAuto-Wake: Sleep Mode (uses AMSR sample rate in SR [0x08] register)Auto-Sleep: Run Mode (uses AWSR sample rate in SR [0x08] register)PMP: Portable Media PlayerPDA: Personal Digital AssistantDFN: Dual Flat No LeadESD: Electro Static DischargeODR: Output Data RateMEMS: Microelectromechanical SystemsSensorsFreescale Semiconductor, 1. PinoutTable 1. Pin DescriptionFigure 2. I2C Connection to MCURESERVEDDVDDDVSSSDASCLRESERVEDN/CAVDD AVSSINTTop View12345678910 Pin # Pin NameDescriptionPin Status1 RESERVEDC onnect to AVSSI nput2N/CNo Internal Connection, leave unconnected or connect to GroundInput3 AVDDD evice PowerInput4 AVSSD evice GroundInput5 INTI nterrupt/Data ReadyOutput6 SCLI2C Serial ClockInput7 SDAI2C Serial DataOpen Drain8 DVSSD igital I/O GroundInput9 DVDDD igital I/O PowerInput10 RESERVEDC onnect to KNOTE:A F ceramic capacitor can be placed connecting pin 3 (AVDD) to pin 4 (AVSS).

7 In addition, another Fceramic capacitor can be place connecting pin 9 (DVDD) to pin 8 (DVSS). The capacitors should be placed closeto the pins of the MMA7660FC and is recommended for testing and to adequately decouple the accelerometerfrom noise on the power Semiconductor, 3. Simplified Accelerometer Functional Block DiagramELECTRO STATIC DISCHARGE (ESD)WARNING: This device is sensitive to electrostatic the Freescale accelerometer contains internal 2000 V ESD protection circuitry, extra precaution must be taken by the user to protect the chip from ESD. A charge of over 2000 V can accumulate on the human body or associated test equipment. A charge of this magnitude can alter the performance or cause failure of the chip.

8 When handling the accelerometer, proper ESD precautions should be followed to avoid exposing the device to discharges which may be detrimental to its performance. Table 2. Maximum Ratings(Maximum ratings are the limits to which the device can be exposed without causing permanent damage.)Rating Symbol Value Unit Maximum Acceleration (all axes, 100 s)gmax10,000gAnalog Supply Voltage to + I/O pins Supply to + Drop Temperature RangeTstg-40 to +125 C Table 3. ESD And Latch-up Protection CharacteristicsRatingSymbolValueUnitHuma n Body ModelHBM 2000 VMachine ModelMM 200 VCharge Device ModelCDM 500 VLatch-up current at TA = 85 C 100mAAVDDDVDDVSSX-axisTransducerY-axisTr ansducerZ-axisTransducerMUXCONTROL LOGICINTC-to-VCONVERTERAMPADCSDASCLOFFSE TTRIMGAINTRIMI2 CINTERNALOSCCLOCKGENS ensorsFreescale Semiconductor, These parameters are tested in production at final Assuming VDD power on slope is < 1 ms.

9 3. A measure of the devices ability to reject an acceleration applied 90 from the true axis of Noise is defined as quantiles given to a sample size. These are the occurrences of noise: 94% = 1 count, 5% = 2 counts, and 1% = 3 4. Operating CharacteristicsUnless otherwise noted: -40 C < TA < 85 C, V < AVDD < V, V < DVDD < V, Acceleration = 0gTypical values are at AVDD = V, DVDD = V, TA = +25 CCharacteristicsSymbolMinTypMaxUnitAnalo g Supply Voltage Standby/Operation Enable Bus Modeon ModeAVDD0 VDigital I/O Pins Supply Voltage Standby/Operation Enable Bus Modeon current DrainOff APower Down ModeIDD2 AStandby Mode(1)IDD0210 AActive Mode, ODR = 1 IDD47 AActive Mode, ODR = 2 IDD49 AActive Mode, ODR = 4 IDD54 AActive Mode, ODR = 8 IDD66 AActive Mode, ODR = 16 IDD89 AActive Mode, ODR = 32 IDD133 AActive Mode, ODR = 64 IDD221 AActive Mode(1), ODR = 120 IDD294 AAcceleration Range Temperature RangeTA-402585 C0g Output Signal (TA = 25 C, AVDD = V)0g Offset range(1)

10 VOFF-303counts0g Offset Temperature + Cmg/ Cmg/ CSensitivity(1) (TA = 25 C, AVDD = V) range Sensitivity at Sensitivity Temperature Variation CInput High x DVDDI nput Low x DVDDO utput Low Voltage (IOL = 6 mA + SDA, INT) Leakage CurrentIIH, AInternal Clock Frequency(1) (TA = 25 C, AVDD = V)tCLK135150165kHzI2C Interface Speed400kHzControl TimingTurn on time from AVDD = 0 V to AVDD = V(2) off time from Active to Standby Mode1msTurn on time Standby to Active Mode12 ms + 1/ODRmsTiming Clock Source Accuracy (TA = 25 C, DVDD = V)-1010%Timing Clock Source Temperature Variation-1515%Cross Axis Sensitivity(3) 1%Noise(4) 1countSensors9 Freescale Semiconductor, OF OPERATIONThe Freescale Accelerometer consists of a MEMS capacitive sensing g-cell and a signal conditioning ASIC contained in a single package.