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PART NUMBER:
± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
KXTF9-4100
Rev. 6
Jun-2011
KXTF9 Embedded Applications
Orientation Detection Feature
The orientation detection feature of the KXTF9 will report changes in face up, face down, +/- vertical and +/-
horizontal orientation.
This intelligent embedded algorithm considers very important factors that provide
accurate orientation detection from low cost tri-axis accelerometers. Factors such as: hysteresis, device
orientation angle and delay time are described below as these techniques are utilized inside the KXTF9.
Hysteresis
A 45° tilt angle threshold seems like a good choice because it is halfway between 0° and 90°.
However, a problem arises when the user holds the device near 45°. Slight vibrations, noise and
inherent sensor error will cause the acceleration to go above and below the threshold rapidly and
randomly, so the screen will quickly flip back and forth between the 0° and the 90° orientations. This
problem is avoided in the KXTF9 by choosing a 30° threshold angle. With a 30° threshold, the screen
will not rotate from 0° to 90° until the device is tilted to 60° (30° from 90°). To rotate back to 0°, the user
must tilt back to 30°, thus avoiding the screen flipping problem. This example essentially applies +/-
15° of hysteresis in between the four screen rotation states. Table 21 shows the acceleration limits
implemented for 30°.
Orientation
0°/360°
90°
180°
270°
X Acceleration (g)
-0.5 < a x < 0.5
a x > 0.866
-0.5 < a x < 0.5
a x < -0.866
Y Acceleration (g)
a y > 0.866
-0.5 < a y < 0.5
a y < -0.866
-0.5 < a y < 0.5
Table 21. Acceleration at the four orientations with +/- 15° of hysteresis
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