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MMA8652FC Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc |
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MMA8652FC Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc |
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16 / 77 page  MMA8652FC Sensors 16 Freescale Semiconductor, Inc. • The tap detection function has various customizing timers, for setting the pulse time width and the latency time between pulses. There are programmable thresholds for all three axes. • The tap detection can be configured to run through the high-pass filter and also through a low-pass filter, which provides more customizing and tunable tap detection schemes. • The status register provides updates on the axes where the event was detected and the direction of the tap. 5.9 Orientation detection The MMA8652FC incorporates an advanced algorithm for orientation detection (ability to detect all 6 orientations) with configurable trip points. The embedded algorithm allows the selection of the mid-point with the desired hysteresis value. 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”. The device operates down to 14° from the flat position. Figure 8 and Figure 9 show the definitions of the trip angles, going from landscape to portrait and then from portrait to landscape. Figure 7. Landscape/Portrait orientation Figure 8. Landscape to Portrait transition Top View PU Earth Gravity Pin 1 X @ 0g Y @ -1g Z @ 0g Xout @ 1g Yout @ 0g Zout @ 0g Xout @ 0g Yout @ 1g Zout @ 0g Xout @ -1g Yout @ 0g Zout @ 0g LL PD LR Side View FRONT Xout @ 0g Yout @ 0g Zout @ 1g BACK Xout @ 0g Yout @ 0g Zout @ -1g 652 PORTRAIT Landscape to Portrait 90 ° Trip Angle = 60 ° 0° Landscape PORTRAIT Portrait to Landscape 90 ° Trip Angle = 30 ° 0° Landscape |
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