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/Title (AN4071, High-Pass Filtered Data and Transient Detection Using the MMA8451, 2, 3Q - Application Notes)
/Author ( Freescale Semiconductor, Inc.)
/Subject (AN4071: The MMA8451, 2, 3Q has a built-in high-pass filter. In the MMA8451, 2Q the output data can go through the high-pass filter, eliminating the offset \(DC\) and low frequencies \(well below the cutoff\). Note that the MMA8453Q does not have the capability to read out data from the high-pass filter. The high-pass filter cutoff frequency can be set by the user to four different frequencies which are dependent on the Output Data Rate \(ODR\).)
/Keywords (AN4071, High-Pass Filtered Data, Transient Detection, MMA8451, low frequencies, MMA8453Q, Output Data Rate \(ODR\))
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The acceleration readings from the sensor couple both static and dynamic accelerations. Many tilt based applications such as orientation detection, scrolling and tilt based gaming apps use the accelerometer analyzing the change in static acceleration due to gravity only. These functions are often best when they’ve been low pass filtered because the high frequency data is considered noise. There are many functions where the accelerometer must analyze the dynamic acceleration. Functions such as taps, flicks, shakes and step counting are based on the analysis of the change in the acceleration with no regard for the static acceleration. These functions interpret the acceleration threshold change and direction of motion. It is simpler to interpret the dynamic acceleration data when the static component has been removed.
High Pass Filtered Data and Transient Detection Using the MMA8451, 2, 3Q
Freescale Semiconductor, Inc.
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2011-10-31T16:12:29-07:00
2004-06-17T10:30:32Z
2011-10-31T16:12:29-07:00
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