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MMA8491Q Datasheet(PDF) 13 Page - Freescale Semiconductor, Inc

Part No. MMA8491Q
Description  Xtrinsic MMA8491Q 3-Axis Multifunction Digital Accelerometer
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MMA8491Q Datasheet(HTML) 13 Page - Freescale Semiconductor, Inc

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MMA8491Q
Sensors
Freescale Semiconductor, Inc.
13
3.6
Tilt angle
Tilt angles can be calculated from the g-value threshold using the equation below. The tilt threshold is 0.688g, which corresponds
to 43.5°. Figure 9 illustrates the tilt angle threshold.
When 0g acceleration is present on an axis, the tilt angle = 0°;
when 1g acceleration is present on an axis, the tilt angle = 90°.
When the tilt angle > the tilt threshold, the output for the axis is HIGH;
when the tilt angle
≤ the tilt threshold, the output for the axis is LOW.
Figure 9. MMA8491Q output is based on tilt angle and sensor g-value
Tilt Angle
g-value
1g
-------------------
⎝⎠
⎛⎞
asin
=
Horizontal
Reference
1g
Threshold = 0.688g
Ø
Threshold (g-value) = 0.688g
Projected g-value =
Tilt Angle φ = 55°
Horizontal
Reference
1g
0.688g
Horizontal
Reference
1g
0.688g
Output = 1
Tilt Angle φ = 30°
Output = 0
Tilt Angle φ = 70°
Output = 1
Ø
Ø


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