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The MMA8451Q is a smart low-power, three-axis capacitive micromachined accelerometer with 14 bits of resolution. This accelerometer is packed with embedded functions with flexible user-programmable options, configurable to two interrupt pins. Embedded interrupt functions allow for overall power savings relieving the host processor from continuously polling data. There is access to both low-pass filtered data as well as high-pass filtered data, which minimizes the data analysis required for jolt detection and faster transitions. The device can be configured to generate inertial wake-up interrupt signals from any combination of the configurable embedded functions allowing the MMA8451Q to monitor events and remain in a low-power mode during periods of inactivity.
Features
- 1.95 to 3.6-volt supply voltage
- 1.6 to 3.6-volt interface voltage
- ±2g/±4g/±8g dynamically selectable full-scale
- Output data rates (ODR) from 1.56 Hz to 800 Hz
- 99 μg/√Hz noise
- 14-bit and 8-bit digital output
- I²C digital output interface (operates to 2.25 MHz with 4.7 kΩ pull-up)
- Two programmable interrupt pins for seven interrupt sources
- Three embedded channels of motion detection
- Freefall or motion detection: one channel
- Pulse detection: one channel
- Jolt detection: one channel
- Orientation (portrait/landscape) detection with programmable hysteresis
- Automatic ODR change for auto-wake and return to sleep
- 32 sample FIFO
- High pass filter data available per sample and through the FIFO
- Self-test
- RoHS compliant
- Current consumption: 6 μA–165 μA
- This product is included in Freescale’s product longevity program, with assured supply for a minimum of 10 years after launch
Related Products
- eCompass applications
- Static orientation detection (portrait/landscape, up/down, left/right, back/front position identification)
- Notebook, eReader and laptop tumble and freefall detection
- Real-time orientation detection (virtual reality and gaming 3-D user position feedback)
- Real-time activity analysis (pedometer step counting, freefall drop detection for HDD, dead-reckoning GPS backup)
- Motion detection for portable product power saving (auto-sleep and auto-wake for cell phone, PDA, GPS, gaming)
- Shock and vibration monitoring (mechatronic compensation, shipping and warranty usage logging)
- User interface (menu scrolling by orientation change, tap detection for button replacement)
Energy Efficiency Quick Facts
- Low current consumption:
- Shutdown is less than 1 µA
- Standby 4 µA
- Normal mode 42-250 µA
- Low-power mode: 27-120 µA
- Configurable auto-wake / sleep
- Learn more about Freescale energy-efficient product solutions
Featured Documentation
- MMA8451Q: Xtrinsic MMA8451Q 3-Axis, 14-bit/8-bit Digital Accelerometer - Data Sheet
- AN4076: AN4076, Data Manipulation and Basic Settings of the MMA8451, 2, 3Q - Application Notes
- AN4076SW: AN4076 Example Code to accompany application note AN4076
- AN4068: AN4068, Embedded Orientation Detection Using the MMA8451, 2, 3Q - Application Notes
- AN4070: AN4070, Motion and Freefall Detection Using the MMA8451, 2, 3Q - Application Notes
- AN4073: AN4073, Using the 32 Sample First In First Out (FIFO) in the MMA8451Q - Application Notes
- AN4071: AN4071, High-Pass Filtered Data and Transient Detection Using the MMA8451, 2, 3Q - Application Notes
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