Xtrinsic Accelerometers
Xtrinsic Accelerometer
MMA845xQ Family
Pin-compatible 14-, 12- and 10-bit accelerometers
Target Applications
Scalable Intelligence in Motion
Freescale’s Xtrinsic accelerometer MMA845xQ family offers extremely low power and pin
compatibility with a broad range of resolution (14-, 12- and 10-bit) and embedded features for
configurable, accurate motion analysis. To operate with extremely low power, the MMA845xQ
accelerometers have six user-configurable sample rates that can be set over a wide range of
1.5 to 800 Hz. The power scheme contains four different power modes from high resolution
to low power, offering best-in-class savings in supply current and extremely high resolution for
very small motion detection.
Pin-to-pin compatibility with register map alignment maximizes hardware re-use between 10-bit
and 14-bit designs where there is zero development cost to migrate from 10-bit to 14-bit
performance. The MMA845xQ accelerometers are feature-rich with a wide range of real-time
motion detection such as orientation, directional shake and tap, jolt, freefall and pedometer
applications. The MMA8451Q contains the 14/8-bit FIFO which holds up to 32 samples of
either low pass filtered (LPF) or high pass filtered (HPF) data, depending on user selection. See
the MMA845xQ accelerometer family comparison table for more details.
• Mobile phones/PMP/PDA/digital
cameras
Orientation detection (portrait/
landscape)
Image stability
Tilt control enabled with higher
resolution
Gesture dialing enhanced with
HPF
Tap to control
Auto wake/sleep for low power
consumption
• Smartbooks/eReaders/
netbooks/laptops
Anti-theft
Freefall detection for hard disk
drives
Orientation detection
Tap detection
MMA8451Q Block Diagram
MMA8451Q Block Diagram
X-axis
Transducer
Y-axis
Transducer
Z-axis
Transducer
Internal
OSC
Clock
GEN
Embedded
DSP
Functions
INT1
INT2
SDA
SCL
• Public transportation ticketing
systems
• Activity monitoring in medical
applications
• Security
Small motions detected with
extremely high resolution
Tilt
Vdd
VddIO
VSS
C to V
Converter
14-bit
ADC
I
2
C
• Fleet monitoring, tracking
Dead reckoning
System auto wake-up on
movement detection
Shock recording
Anti-theft
Toll payment
Configurable Embedded DSP Functions
32 Data Point
Configurable
FIFO Buffer
with Watermark
Freefall and
Motion
Detection
Transient
Detection
(i.e., fast
motion, jolt)
Enhanced
Orientation with
Hysteresis
and Z-Lockout
Shake
Detection
through Motion
Threshold
Single, Double
and Directional
Tap Detection
• Unbalance detection for washers
• Power tools and small
appliances
Tilt
Safety shutoff
Auto-Wake/Auto-Sleep Configurable with debounce counter and multiple motion interrupts for control
MODE Options
Low Power
Low Noise + Power
High Resolution
Normal
MODE Options
ACTIVE Mode
WAKE
Auto-WAKE/SLEEP
ACTIVE Mode
SLEEP
Low Power
Low Noise + Power
High Resolution
Normal
Freescale: A Leader in
Sensing Solutions
Expanding on more than 30-years of sensor
innovation, our Xtrinsic sensing solutions
are designed with the right combination
of high-performance sensing capability,
processing capacity and customizable
software to help deliver smart, differentiated
sensing applications. With Xtrinsic sensing
solutions, our vision is to offer a diverse
and differentiated product portfolio to meet
the expanding needs of the automotive,
consumer and industrial segments. Xtrinsic
solutions offer ideal blends of functionality
and intelligence designed to help our
customers differentiate and win in highly
competitive markets.
Freescale Accelerometer Product Feature Comparison
Features
Digital Capability
Supply voltage
Resolution
Power
consumption
Low noise
(at 400 Hz ODR)
Output data rate
1.71–1.89
12-bit
27 uA
375 μg/√Hz
1.563–400 Hz
1.95–3.6
14-bit
6 uA
99 μg/√Hz
1.563–800 Hz
1.95–3.6
12-bit
6 uA
99 μg/√Hz
1.563–800 Hz
1.95–3.6
10-bit
6 uA
99 μg/√Hz
1.563–800 Hz
Wider supply voltage to
support various applications
Higher resolution for more
precise applications
Lower power for significant
battery savings
Lower noise for more
precise applications
Increased bandwidth to
support various applications
MMA8450Q
MMA8451Q
MMA8452Q
MMA8453Q
Benefits
Embedded Features
Freefall detection
Orientation
detection
Embedded FIFO
buffer
Tap detect
Yes
Yes
Yes
Tap/double tap
Shake
Yes
Yes
Yes
Yes
Yes
Tap/double tap
Directional tap
Shake
Directional
shake
Yes
Yes
Yes
Yes
No
Tap/double tap
Directional tap
Shake
Directional
shake
Yes
Yes
Yes
Yes
No
Tap/double tap
Directional tap
Shake
Directional
shake
No
Yes
Fast UI response
Fast UI response
Reduced I
2
C bus traffic
System power savings
Fast UI response
System power savings
Fast UI response
System power savings
Reduced system cycle time
System power savings
Development Tools
Part Number
Description
This LFSTBEB845x kit
includes three accelerometer
development boards that
represent the MMA845xQ
family. These boards
connect to the LFSTBUSB
communication board that is
sold separately.
The RDMMA845x bundled kit
includes all three MMA845xQ
accelerometer development
boards as well as the
accelerometer USB board.
This LFSTBEB8450
accelerometer development
board provides an evaluation
platform for the MMA8450Q
accelerometer and includes
the QE8 MCU for data
acquisition.
This Sensor Toolbox kit
comes with the accelerometer
MMA8450Q accelerometer
development board and the
USB board.
Shake detect
High pass
filtered data
Auto-wake/sleep
LFSTBEB845x
Documentation
Document Number
MMA8450Q/MMA8451Q/
MMA8452Q/MMA8453Q
AN4068
AN4069
AN4070
AN4071
AN4072
AN4073
AN4074
AN4075
AN4076
AN4077
Description
Product Specification Data Sheets
Embedded Orientation Detection Using the MMA8451, 2, 3Q
Offset Calibration of the MMA8451, 2, 3Q
Motion and Freefall Detection Using the MMA8451, 2, 3Q
High Pass Filtered Data and Functions Using the MMA8451, 2, 3Q
MMA8451, 2, 3Q Single/Double and Directional Tap Detection
Using the 32 Sample First In, First Out (FIFO) in the MMA8451Q
Auto-Wake/Sleep Using the MMA8451,2,3Q
How Many Bits Are Enough? The Trade-off Between High Resolution and Low
Power Using Oversampling Modes
Data Manipulation and Basic Settings of the MMA8451, 2, 3Q
MMA8451, 2, 3Q Design Checklist and Board Mount Guidelines
RDMMA845x
LFSTBEB8450
RD3924MMA8450Q
The Xtrinsic accelerometer MMA845xQ family
is hardware and software compatible.
For more information, visit
freescale.com/xyz
Freescale, the Freescale logo, the Energy Efficient Solutions logo and Xtrinsic are trademarks of Freescale Semiconductor, Inc.,
Reg. U.S. Pat. & Tm. Off. All other product or service names are the property of their respective owners.
© 2010, 2014 Freescale Semiconductor, Inc.
Document Number: MMA845XQFS REV 1
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