HAL 502
4.2. HAL 502
The HAL 502 is the most sensitive latching sensor of
this family (see Fig. 4–5).
The output turns low with the magnetic south pole on
the branded side of the package and turns high with
the magnetic north pole on the branded side. The out-
put does not change if the magnetic field is removed.
For changing the output state, the opposite magnetic
field polarity must be applied.
For correct functioning in the application, the sensor
requires both magnetic polarities (north and south) on
the branded side of the package.
Magnetic Features:
– switching type: latching
– high sensitivity
– typical BON: 2.6 mT at room temperature
– typical BOFF:
−2.6
mT at room temperature
– operates with static magnetic fields and dynamic
magnetic fields up to 10 kHz
– typical temperature coefficient of magnetic switching
points is
−1000
ppm/K
B
OFF
0
B
ON
Applications
DATA SHEET
The HAL 502 is the optimal sensor for all applications
with alternating magnetic signals and weak magnetic
amplitude at the sensor position such as:
– applications with large air gap or weak magnets,
– rotating speed measurement,
– commutation of brushless DC motors,
– CAM shaft sensors, and
– magnetic encoders.
Output Voltage
V
O
B
HYS
V
OL
B
Fig. 4–5:
Definition of magnetic switching points for
the HAL 502
Magnetic Characteristics
at T
J
=
−40 °C
to +170
°C,
V
DD
= 3.8 V to 24 V,
Typical Characteristics for V
DD
= 12 V
Magnetic flux density values of switching points.
Positive flux density values refer to the magnetic south pole at the branded side of the package.
Parameter
T
J
−40 °C
25
°C
140
°C
170
°C
Min.
1
1
0.9
0.9
On point B
ON
Typ.
2.8
2.6
2.4
2.3
Max.
5
4.5
4.3
4.3
Off point B
OFF
Min.
−5
−4.5
−4.3
−4.3
Typ.
−2.8
−2.6
−2.4
−2.3
Max.
−1
−1
−0.9
−0.9
Hysteresis B
HYS
Min.
4.5
4.5
3.7
3.5
Typ.
5.6
5.2
4.8
4.6
Max.
7.2
7
6.8
6.8
Magnetic Offset
Min.
−
−1.5
−
−
Typ.
0
0
0
0
Max.
−
1.5
−
−
mT
mT
mT
mT
Unit
The hysteresis is the difference between the switching points B
HYS
= B
ON
−
B
OFF
The magnetic offset is the mean value of the switching points B
OFFSET
= (B
ON
+ B
OFF
) / 2
24
Jan. 11. 2010; DSH000020_004EN
Micronas
MICRONAS [ MICRONAS ]
