HAL 502
DATA SHEET
4.2. HAL 502
Applications
The HAL 502 is the most sensitive latching sensor of
this family (see Fig. 4–5).
The HAL 502 is the optimal sensor for all applications
with alternating magnetic signals and weak magnetic
amplitude at the sensor position such as:
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.
– applications with large air gap or weak magnets,
– rotating speed measurement,
– commutation of brushless DC motors,
– CAM shaft sensors, and
– magnetic encoders.
For correct functioning in the application, the sensor
requires both magnetic polarities (north and south) on
the branded side of the package.
Output Voltage
VO
Magnetic Features:
– switching type: latching
BHYS
– high sensitivity
– typical BON: 2.6 mT at room temperature
– typical BOFF: −2.6 mT at room temperature
VOL
B
BOFF
0
BON
– operates with static magnetic fields and dynamic
magnetic fields up to 10 kHz
Fig. 4–5: Definition of magnetic switching points for
– typical temperature coefficient of magnetic switching
the HAL 502
points is −1000 ppm/K
Magnetic Characteristics at TJ = −40 °C to +170 °C, VDD = 3.8 V to 24 V,
Typical Characteristics for VDD = 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
On point B
Typ.
2.8
Off point B
Typ.
Hysteresis B
HYS
Magnetic Offset
Unit
ON
OFF
T
Min.
1
Max.
5
Min.
−5
Max.
Min.
Typ.
5.6
5.2
4.8
4.6
Max.
Min.
Typ.
Max.
J
−40 °C
25 °C
−2.8
−1
4.5
4.5
3.7
3.5
7.2
7
−
0
0
0
0
−
mT
mT
mT
mT
1
2.6
4.5
4.3
4.3
−4.5
−4.3
−4.3
−2.6
−1
−1.5
−
1.5
−
140 °C
170 °C
0.9
0.9
2.4
−2.4
−0.9
−0.9
6.8
6.8
2.3
−2.3
−
−
The hysteresis is the difference between the switching points BHYS = BON − BOFF
The magnetic offset is the mean value of the switching points BOFFSET = (BON + BOFF) / 2
24
Jan. 11. 2010; DSH000020_004EN
Micronas
MICRONAS [ MICRONAS ]
