MLX90333
Triaxis 3D-Joystick Position Sensor
400
300
200
Magnetic Flux Density (G)
100
0
-100
-200
-300
-400
-90
B
X
-45
0
Alpha
α
(Deg)
B
Y
45
B
Z
90
Figure 6 – Magnetic Flux Density –
β
= 0 Deg – B
X
∝
sin(α), B
Y
= 0 & B
Z
∝
cos(α)
400
300
200
Magnetic Flux Density (G)
100
0
-100
-200
-300
-400
-90
B
X
-45
0
Beta
β
(Deg)
B
Y
45
B
Z
90
Figure 7 – Magnetic Flux Density –
α
= 0 Deg – B
X
= 0, B
Y
∝
sin(β) & B
Z
∝
cos(β)
Three (3) differential voltages corresponding to the three (3) components of the applied flux density are
provided to the ADC (Analog-to-Digital Converter – Figure 8 and Figure 9). The Hall signals are
processed through a fully differential analog chain featuring the classic offset cancellation technique (Hall
plate quadrature spinning and chopper-stabilized amplifier).
The amplitude of V
Z
is smaller than the other two (2) components V
X
and V
Y
due to fact that the magnetic
gain of the IMC only affects the components parallel to the IC surface.
3901090333
Rev. Preliminary
Page 9 of 38
Data Sheet
May 07
MELEXIS [ Melexis Microelectronic Systems ]
