MMA8450QR1 3-Axis, 8 / 12-bit Digital Accelerometer IC
General Description:
The MMA8450QR1 is a smart low-power, three-axis, capacitive micromachined accelerometer featuring 12 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. The MMA8450QR1’s Embedded FIFO buffer can be configured to log up to 32 samples of X,Y and Z-axis 12-bit (or 8-bit for faster download) data. The FIFO enables a more efficient analysis of gestures and user programmable algorithms, ensuring no loss of data on a shared I2C bus, and enables system level power saving (up to 96% of the total power consumption savings) by allowing the applications processor to sleep while data is logged. 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 MMA8450QR1 has user selectable full scales of ±2g/±4g/±8g. The device can be configured to generate inertial wake-up interrupt signals from any combination of the configurable embedded functions allowing the MMA8450QR1 to monitor events and remain in a low power mode during periods of inactivity. The MMA8450QR1 is available in a 3 x 3 x 1 mm QFN package.
Features:
- 1.71 V to 1.89 V supply voltage
- ±2g/±4g/±8g dynamically selectable full-scale
- Output Data Rate (ODR) from 400 Hz to 1.563 Hz
- 375 g/√Hz noise at normal mode ODR = 400 Hz
- 12-bit digital output
- I2C digital output interface (operates up to 400 kHz Fast Mode)
- Programmable 2 interrupt pins for 8 interrupt sources
- Extended Temperature Range: -40°C to +125°C
- Embedded 4 channels of motion detection
- Freefall or motion detection: 2 channels
- Pulse Detection: 1 channel
- Transient (Jolt) Detection: 1 channel
- Orientation (Portrait/Landscape) detection with hysteresis compensation
- Automatic ODR change for auto-wake and return-to-sleep
- 32 sample FIFO
- Self-Test
- 10,000g high shock survivability
- RoHS compliant
Applications:
- Static orientation detection (portrait/landscape, up/down, left/right, back/ front position identification)
- Real-time orientation detection (virtual reality and gaming 3D 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
Related Product Information:
| Part No | Description |
| MMA8450QT | 8 / 12-bit Digital Accelerometer IC - QFN-16 - Tray |
| MMA8450QR1 | 8 / 12-bit Digital Accelerometer IC - QFN-16 - Tape and Reel |