Sensors MMA7660FC Three-axis low g digital acceleration sensor Smart Motion with Power Select Freescale Semiconductor’s MMA7660FC is a three-axis low g I2C digital capacitive acceleration sensor with extremely low power at 47 uA at one sample per second—contained in a small, low-profile 3 x 3 x 0.9 mm DFN package. The MMA7660FC accelerometer integrates intelligent features with reduced power consumption to address portable consumer devices. MMA7660FC Block Diagram AVDD DVDD Internal OSC X-axis Transducer VSS Y-axis Transducer Z-axis Transducer MUX • Mobile phones/PMP/PDA/digital cameras Orientation detection (portrait/landscape) Image stability Text scroll Motion dialing Tap to mute Auto wake/sleep for low power consumption • Laptop PCs Anti theft Freefall detection for hard disk drives • Gaming Motion detection • Mercury and roll ball switch replacement • Safety shutoff • Activity monitoring in medical applications SDA C-to-V Converter Offset Trim AMP ADC I2C SCL Gain Trim INT Control Logic The device provides conversion to digital values at a user-configurable output data rate, offering proportional savings in supply current and power. The MMA7660FC accelerometer can be used for sensor data changes, product orientation and gesture detection through an interrupt pin (INT). By providing I2C, the MMA7660FC directly interfaces to the main system processor for communication flexibility. Target Applications Clock GEN Orientation Detection Tap Detection Shake Detection Portrait/landscape orientation detection for applications such as mobile phones, PDAs and portable media players. The six different orientation positions include left, right, up, down, back and front. The orientation is determined in three dimensions whenever the device position becomes static via filtering and optional debouncing. This enables selection of portrait or landscape display modes and facilitates switching off the display for power saving if the product is placed face-down. Tap detection can be used for a number of different applications such as button replacement on mobile phones, PDAs and portable media players. For example, when using a media player, a single tap can stop a song from playing and a double tap can play a song. This function detects fast transitioning pulses determined by tunable thresholds and durations. The shake feature performs functions such as scrolling through images or Web pages on mobile phones, PDAs and portable media players. The shake interrupt can be enabled on any of the three axes. Features Selector Guide • ±1.5g three-axis digital accelerometer with I2C • Low-profile 3 x 3 x 0.9 mm DFN package • Low current consumption Off mode: 0.4 μA Part Number Acceleration (g) High sensitivity (LSB/g) IDD (μA) Off mode (μA) Standby mode (μA) Communication Package +/-1.5 21 47 at 1 sample per second 0.4 2 I2C 3x3x 0.9 mm DFN MMA7660FCT MMA7660FCR1 Standby mode: 2 μA Development Tools Active mode: 47 μA at one sample per Part Number Description RD3803MMA7660FC A complete kit that includes the evaluation board plus the DIP board as well as software and USB connectors KIT3803MMA7660FC A simple DIP board that is extremely helpful for sampling the device second Configurable output data rate from 1 to 120 samples per second • Configurable auto wake/sleep for low power consumption • Low voltage operation: 2.4V–3.6V 1.71V–3.6V for digital I/O (including I2C) • Configurable tilt orientation detection for portrait/landscape capability • Gesture detection including shake and tap detection • Robust design, ability to survive shocks up to 10,000g Benefits Documentation Document Number Title Description MMA7660FC MMA7660FC Data Sheet Presents the specifications for this product AN3803 Using the MMA7660FC Accelerometer Evaluation Board Presents how to use the accelerometer evaluation board Quick Start Guide The RD3803MMA7660FC Quick Start Guide Presents how to get started quickly with the RD3803MMA7660FC Modes of Operation Measurement and Power Mode saving modes • Intelligent device with configurable orientation, shake and tap detection • Digital accelerometer with direct I2C interface for communication flexibility • Compact package enables intelligent motion features in hand-held products Freescale is a leading provider of pressure, inertial and touch sensors and has offered portfolio of ZigBee® technology, microcontrollers, microprocessors, digital signal processors, analog ICs and development tools to offer system solutions to customers. Off Off I²C activity is not available on bus Off On I²C activity is not available on bus MMA7660FC does not load the I2C bus and does not respond. Bus can be used by other devices. On Off I2C activity is ignored by MMA7660FC Standby Mode MMA7660FC responds to I²C bus activity On On MMA7660FC registers can be accessed to set device to Active Mode when desired. Sensor measurement system is idle. Active Mode with Auto-Sleep MMA7660FC responds to I²C and Auto-Wake bus activity features State Machine of Modes On On MMA7660FC sensor measurement system runs at programmable output data rate. Digital analysis functions run. Tap detection does not operate in Sleep state. DVdd = ON DVdd = ON AVdd -> ON OFF mode STANDBY mode AVdd -> OFF Write 1 to MODE bit AVdd -> OFF Write 0 to MODE bit Active Mode RUN mode (Normal Sampling Rate) Auto-Wake Activity detected and AWE=1 Auto-Sleep No activity within time window and ASE=1 SLEEP mode (Reduced Sampling Rate) Transition from RUN to SLEEP can occur if the following are true: • Sleep counter elapsed • No change in tilt status • Shake has not occurred • No change in acceleration Learn More: Freescale and the Freescale logo are trademarks or registered trademarks of Freescale Semiconductor, Inc. in the U.S. and other countries. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc. 2009 Document Number: MMA7660FCFS REV 1 Function Off Mode MEMS-based sensors for over 30 years. The sensor ICs complement Freescale’s broad AVdd MMA7660FC clamps I2C bus to DVdd pin. I2C bus cannot be used by other devices. sample rates • Low-power device with configurable power DVdd Power Down Mode • Power select helps achieve optimal current consumption by choosing one of eight I²C Bus For current information about Freescale products and documentation, please visit www.freescale.com/xyz.