Acceleration Sensors MMA8450Q Low-power, 12-bit, 3-axis accelerometer Simplifying complexity The Freescale MMA8450Q is a 12-bit, 3-axis, MMA8450Q Block Diagram low g, I2C, digital capacitive acceleration sensor with power as low as 27 uA in active mode, VDD contained in a small, low-profile 3 x 3 x 1 mm VSS QFN package. The MMA8450Q next-generation motion sensing device provides 12-bit data with first in, first out (FIFO) to accomplish complex Internal OSC X-axis Transducer Y-axis Transducer C to V Converter Clock GEN Embedded DSP Functions 12-bit ADC I2C SDA SCL Z-axis Transducer gesture recognition and position detection required for next-generation mobile applications that go beyond basic algorithms. The MMA8450Q accelerometer provides increased embedded intelligence such as orientation, tap, double tap, jolt, freefall and shake detection. Utilizing the embedded functions in the MMA8450Q, customers can develop more robust applications such as position detection, 3-D gesture detection, pedometry and many other next-generation Configurable Embedded DSP Functions 32 data point configurable FIFO buffer with watermark Freefall and motion detection (2 channels) Transient detection (ie. fast motion, jolt) Enhanced orientation with hysteresis and Z-lockout Shake detection through motion threshold Tap and double tap detection Auto-wake/auto-sleep configurable with debounce counter and multiple motion interrupts for control Normal Mode Active Mode Low Power Mode Auto-Wake Auto-Sleep Sleep Mode (Reduced Sampling Rate) motion detection functions. The MMA8450Q has two programmable interrupt pins, making it possible to monitor two functions extremely low power, the MMA8450Q has six to the sample rate. The power scheme independently. There are eight interrupt user configurable sample rates that can be set contains normal mode and low-power mode, sources that can be configured to use these over a wide range of 1.5 to 400 samples per allowing the customer to achieve optimal two independent interrupt pins. To operate with second where operating current is proportional power consumption targets. Typical Applications • Mobile phones/PMP/PDA/digital cameras Orientation detection (portrait/landscape) Image stability Tilt control enabled with higher resolution Gesture dialing enhanced with high pass filter Tap to control Auto wake/sleep for low power consumption • Smartbooks/ereaders/netbooks/laptops o Anti-theft o Freefall detection for hard disk drives o Orientation detection o Tap detection • Public transportation ticketing systems • Activity monitoring in medical applications • Security Shock detection Tilt • Fleet monitoring, tracking Dead reckoning System auto wake-up on movement detection Shock recording Anti-theft • Power tools and small appliances Tilt Safety shutoff RD3924MMA8450Q LFSTBEB8450 Development Tools Part Number Description LFSTBEB8450 This LFSTBEB8450 accelerometer development board provides an evaluation platform for the MMA8450Q accelerometer and includes the QE8 MCU for data acquisition. This board can work with the LFSTBUSB communication board that is sold separately. This Sensor Toolbox kit comes with the accelerometer LFSTBUSB development and the LFSTBUSB boards RD3924MMA8450Q Freescale is a leading provider of pressure, inertial and touch sensors and has offered MEMS-based sensors for over 30 years. The sensor ICs complement Freescale’s broad portfolio of ZigBee® technology, microcontrollers, microprocessors, digital signal processors, analog ICs and development tools to offer system solutions to customers. Freescale Accelerometer Product Feature Comparison Feature MMA8450Q MMA7455L MMA7660FC Digital resolution 12-bit 10-bit 6-bit Digital output IC I C, SPI I 2C Current consumption • • • • • Shutdown: 2 uA • Standby: 10 uA • Normal mode: 400 uA • Shutdown: 2 uA • Standby: 10 uA • Normal mode: 50–300 uA Programmable interrupt pins 2 2 1 3 x 3 x 1 mm QFN 3 x 5 x 1 mm LGA 3 x 3 x 0.9 mm DFN Digital Capability 2 2 Shutdown: < 1 uA Standby: 4 uA Normal mode: 42–250 uA Low-power mode: 27–120 uA Package Package type g-Cell or Sensing Cell Dynamic range 2g/4g/8g 2g/4g/8g 1.5g Axis 3-axis 3-axis 3-axis Drop shock 10,000g 10,000g 10,000g Embedded Functions/Features Selectable output data rate With reduced current specifications No reduced current specifications With reduced current specifications Freefall 2 channels programmable 2 channels programmable N/A Motion detection 2 channels programmable 1 channel programmable 1 channel, fixed threshold Tap detection 1 channel 2 channels 1 channel Transient detection 1 channel N/A N/A Orientation (portrait/landscape) detection • Includes hysteresis compensation • Programmable trip points • Z-lockout N/A No hysteresis FIFO • 12-bit data • 32 samples for each axis N/A N/A Auto-wake/sleep Configurable with up to 5 interrupts. Sleep counter configurable for up to 325 seconds N/A Configurable with up to 4 interrupts Self test Yes Yes I2C Test Documentation Freescale Document Number Description MMA8450Q Product Specifications Data Sheet AN3915 Embedded Orientation Detection Using the MMA8450Q AN3916 Offset Calibration of the MMA8450Q AN3917 Motion and Freefall Detection Using the MMA8450Q AN3918 High Pass Filtered Data and Transient Detection Using the MMA8450Q AN3919 MMA8450Q Single/Double and Directional Tap Detection AN3920 Using the 32 Sample First In, First Out (FIFO) in the MMA8450Q AN3921 Low-Power Modes and Auto-Wake/Sleep Using the MMA8450Q AN3922 Data Manipulation and Basic Settings of the MMA8450Q AN3923 MMA8450Q Design Checklist and Board Mounting Guidelines 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. 2010. Document Number: MMA8450QFS REV 0 For current information about Freescale products and documentation, please visit www.freescale.com/xyz.