MMA8451Q Просмотр технического описания (PDF) - Freescale Semiconductor
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MMA8451Q Datasheet PDF : 52 Pages
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Freescale Semiconductor
Data Sheet: Technical Data
An Energy Efficient Solution by Freescale
Document Number: MMA8451Q
Rev. 7.1, 05/2012
3-Axis, 14-bit/8-bit
Digital Accelerometer
MMA8451Q
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 wakeup 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. The MMA8451Q is
available in a 3 mm by 3 mm by 1 mm QFN package.
Top and Bottom View
Features
• 1.95V to 3.6V supply voltage
• 1.6V to 3.6V 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 pullup)
• Two programmable interrupt pins for seven interrupt sources
• Three embedded channels of motion detection
• Freefall or Motion Detection: 1 channel
• Pulse Detection: 1 channel
• Jolt Detection: 1 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
16 PIN QFN
3 mm by 3 mm by 1 mm
CASE 2077-02
Top View
VDDIO 1
BYP 2
NC 3
SCL 4
GND 5
16 15 14
678
13 NC
12 GND
11 INT1
10 GND
9 INT2
Typical Applications
• eCompass applications
• Static orientation detection (Portrait/Landscape, Up/Down, Left/Right, Back/
Pin Connections
Front position identification)
• Notebook, eReader and Laptop Tumble and Freefall Detection
• 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)
Part Number
MMA8451QT
MMA8451QR1
ORDERING INFORMATION
Temperature Range
Package Description
-40°C to +85°C
QFN-16
-40°C to +85°C
QFN-16
Shipping
Tray
Tape and Reel
© 2010-2012 Freescale Semiconductor, Inc. All rights reserved.
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