DATA SHEET
HAL581
4.6. HAL581
Applications
The HAL581 is a medium sensitive unipolar switching
sensor with an inverted output (see Fig. 4–21).
The HAL581 is designed for applications with one
magnetic polarity and weak magnetic amplitudes at
the sensor position where an inverted output signal is
required such as:
The sensor turns to low current consumption with the
magnetic south pole on the branded side of the pack-
age and turns to high current consumption if the mag-
netic field is removed. It does not respond to the mag-
netic north pole on the branded side.
– applications with large airgap or weak magnets,
– solid state switches,
– contactless solutions to replace micro switches,
– position and end point detection, and
– rotating speed measurement.
For correct functioning in the application, the sensor
requires only the magnetic south pole on the branded
side of the package.
Current consumption
Magnetic Features:
– switching type: unipolar inverted
– medium sensitivity
IDDhigh
BHYS
– typical BON: 10 mT at room temperature
– typical BOFF: 12 mT at room temperature
IDDlow
– typical temperature coefficient of magnetic switching
points is 0 ppm/K
0
BON
BOFF
B
– operates with static magnetic fields and dynamic
magnetic fields up to 10 kHz
Fig. 4–21: Definition of magnetic switching points for
the HAL581
Magnetic Characteristics at TJ = −40 °C to +140 °C, VDD = 3.75 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
Off point B
Hysteresis B
HYS
Magnetic Offset
Unit
ON
OFF
T
Min.
6.5
6.5
6.5
6.5
Typ.
10
Max.
13.8
13.8
13.8
14.3
Min.
Typ.
12
Max.
Min.
Typ.
Max.
Min.
Typ.
11
Max.
J
−40 °C
25 °C
8
8
8
8
15.5
15.5
15.5
16
0.5
0.5
0.5
0.5
2
2
2
2
3.5
3.5
3.5
3.5
mT
mT
mT
mT
10
12
11
100 °C
140 °C
10
12
11
10.4
12
11
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
Micronas
Dec. 22, 2008; DSH000145_003EN
29
MICRONAS [ MICRONAS ]
