mlx90254 Melexis Company, mlx90254 Datasheet - Page 5

• Manufacturer Part Number: mlx90254
• Description: Differential Dynamic Hall Effect Sensor
• Manufacturer: Melexis Company

6. MLX90254 Sensor Specific Specifications
DC Operating Parameters T
Parameter
(4) The differential field must exceed 6 mT to assure the switching of the output
7. General Description
Let us model the magnetic flux densities by sinusoids. If the wheel confirms a certain geometrical
property, the two Hall cells see two magnetic flux densities in phase opposition. They are illustrated by the
dashed sinusoid on figure 1.
The difference between the two Hall signals is computed and amplified. The remaining DC offset is
removed by the high-pass filter. The noise that is out of the signal bandwidth is attenuated by the low-
pass filter in order to minimize the output jitter.
The AC differential signal is compared to the Bop and Brp threshold and the result of that comparison
commands the open drain output transistor.
3901090254
Rev. 005
-10
-15
-20
40
35
30
25
20
15
10
-5
5
0
1
Figure 1: Output toggling according to the differential magnetic signal.
2
A
Symbol
= -40
3
o
C to 150
4
Test Conditions
o
C, V
5
Output Voltage Vs the Angle
Differential Dynamic Hall Effect Sensor
Angle (Degree)
DD
Page 5 of 9
= 4V to 24V (unless otherwise specified)
6
7
8
Min
9
MLX90254
Typ
B1
B2
BAC
OUT
10
12
10
8
6
4
2
0
-2
Max
Datasheet
Units
Jun/04