MMA8652FC datasheet(16/77 Pages) FREESCALE

16 / 77 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

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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.

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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.

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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

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

Side View

FRONT

Xout @ 0g

Yout @ 0g

Zout @ 1g

BACK

Xout @ 0g

Yout @ 0g

Zout @ -1g

652

PORTRAIT

Landscape to Portrait

Trip Angle = 60

0° Landscape

PORTRAIT

Portrait to Landscape

Trip Angle = 30

0° Landscape

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