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MMA8652FC Datasheet(PDF) 17 Page - NXP Semiconductors |
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MMA8652FC Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 65 page ![]() MMA8652FC Sensors Freescale Semiconductor, Inc. 17 Figure 7. Landscape-to-Portrait transition trip angles The MMA8652FC orientation detection algorithm confirms the reliability of the function with a configurable Z-lockout angle. Based on the known functionality of linear accelerometers, it is not possible to rotate the device about the Z-axis, to detect change in acceleration at slow angular speeds. The angle at which the device no longer detects the orientation change is referred to as the “Z-lockout angle” (see Figure 8). The device operates down to 14° from the flat position. . Figure 8. Z-Tilt angle lockout transition PORTRAIT Landscape-to-Portrait 90 ° Trip Angle = Midpoint + hysterisis value 0° Landscape PORTRAIT Portrait-to-Landscape 90 ° Trip Angle = midpoint - hysteresis value 0° Landscape UPRIGHT NORMAL 90 ° Z-LOCK 0° FLAT DETECTION REGION LOCKOUT REGION When lifting the device upright from the flat position, orientation detection will be active for orientation angles greater than a user-configurable value. The default angle is 29° from flat, but the angle can be set as low as 14°. |
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