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PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTF9-4100
Rev. 6
Jun-2011
Device Orientation Angle (aka Tilt Angle)
To ensure that horizontal and vertical device orientation changes are detected, even when it isn’t in the
ideal vertical orientation – where the angle θ in Figure 2 is 90°, the KXTF9 considers device orientation
angle in its algorithm.
Angle ?
Figure 2. Device Orientation Angle
As the angle in Figure 2 is decreased, the maximum gravitational acceleration on the X-axis or Y-axis
will also decrease. Therefore, when the angle becomes small enough, the user will not be able to
make the screen orientation change. When the device orientation angle approaches 0° (device is flat
on a desk or table), ax = ay = 0g, az = +1g, and there is no way to determine which way the screen
should be oriented, the internal algorithm determines that the device is in either the face-up or face-
down orientation, depending on the sign of the z-axis.
The KXTF9 will only change the screen
orientation when the orientation angle is above the factory-defaulted/user-defined threshold set in the
TILT_ANGLE register. Equation 2 can be used to determine what value to write to the TILT_ANGLE
register to set the device orientation angle.
TILT_ANGLE (counts) = sin θ * (32 ( counts/g))
Equation 2. Tilt Angle Threshold
Tilt Timer
The 8-bit register, TILT_TIMER can be used to qualify changes in orientation. The KXTF9 does this by
incrementing a counter with a size that is specified by the value in TILT_TIMER for each set of
acceleration samples to verify that a change to a new orientation state is maintained. A user defined
output data rate (ODR) determines the time period for each sample. Equation 3 shows how to
calculate the TILT_TIMER register value for a desired delay time.
TILT_TIMER (counts) = Delay Time (sec) x ODR (Hz)
Equation 3. Tilt Position Delay Time
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