mlx90333 Melexis Company, mlx90333 Datasheet - Page 8

• Manufacturer Part Number: mlx90333
• Description: Triaxis? 3d-joystick Position Sensor
• Manufacturer: Melexis Company

In summary, along X-axis, the left Hall plate measures “B
- B
“-B
Through an appropriate signal processing, the Tria⊗is™ sensor front-end reports the three (3)
components of the applied magnetic flux density B i.e. B
Indeed, by subtracting the signals from the two (2) Hall plates in each pair, the components B
are measured while B
each pair, the component B
In a joystick based on a “gimbal” mechanism as shown on Figure 3 (left), the magnet (axial magnetization)
moves on a hemisphere centered at the IC. The flux density is described through the following
relationships:
Those components are plotted on the Figure 5, Figure 6 and Figure 7.
3901090333
Rev. 001
Z
Y⊥
”. Similarly, along the Y-axis, the left Hall plate measures “B
- B
Z
”.
Z
is cancelled. To the contrary, by adding the signals from the two (2) Hall plates in
Z
is measured while B
Figure 5 – Magnetic Flux Density – B
B
B
B
Y
Z
X
=
=
=
COS
COS
SIN
Tria⊗is™ 3D-Joystick Position Sensor
X⊥
Page 8 of 43
(
(
(
α
and B
α
α
)
)
)
⋅
⋅
⋅
X
COS
SIN
COS
, B
X⊥
Y⊥
Y
- B
are cancelled
(
(
and B
β
(
β
β
Z
Y⊥
)
” while the right Hall plate measures “-B
)
)
- B
X
Z
, B
.
Z
” while the right Hall plate measures
Y
, B
Z
MLX90333
Data Sheet
X⊥
and B
Jan 08
X⊥
Y⊥