MLX90333 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MLX90333

Triaxis 3D-Joystick Position Sensor

Unspecified 

MLX90333

Triaxis 3D-Joystick Position Sensor

In summary, along X-axis, the left Hall plate measures “BX⊥ - BZ” while the right Hall plate measures “-BX⊥

- BZ”. Similarly, along the Y-axis, the left Hall plate measures “BY⊥ - BZ” while the right Hall plate measures

“-BY⊥ - BZ”.

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. BX, BY and BZ.

Indeed, by subtracting the signals from the two (2) Hall plates in each pair, the components BX⊥ and BY⊥

are measured while BZ is cancelled. To the contrary, by adding the signals from the two (2) Hall plates in

each pair, the component BZ is measured while BX⊥ and BY⊥ are cancelled

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:

BX = SIN (α ) ⋅ COS(β )

BY = COS(α ) ⋅ SIN (β )

BZ = COS(α ) ⋅ COS(β )

Those components are plotted on the Figure 5, Figure 6 and Figure 7.

Figure 5 – Magnetic Flux Density – BX, BY, BZ

3901090333

Rev. Preliminary

Page 8 of 38

Data Sheet

May 07

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