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MLX90333
Triaxis 3D-Joystick Position Sensor
3901090333
Page 21 of 38
Data Sheet
Rev. Preliminary
May 07
α
β
x
y
z
14.3.2. Alpha/Beta Discontinuity Point (or Zero Degree Point)
The Discontinuity Point defines the zero point of the circle (Alpha or Beta). The discontinuity point places
the origin at any location of the trigonometric circle (see Figure 12).
For a Joystick Application, Melexis recommends to set the DP to zero.
14.3.3. LNR Parameters
The LNR parameters, together with the clamping values, fully define the relation (the transfer function)
between the digital angles (Alpha and Beta) and the output signals.
The shape of the MLX90333 transfer function from the digital angle values to the output voltages is
described by the drawing below (See Figure 11). Four segments can be programmed but the clamping
levels are necessarily flat.
Alpha
ALPHA_S1
ALPHA_S0
360°
Clamping Low
Clamping High
ALPHA_X
ALPHA_Y
CLAMPHIGH
CLAMPLOW
0%
100%
0°
B
A
C
Figure 11 - Digital Angle (Alpha) Transfer Characteristic (Idem ditto for Beta)
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