HAL581
ADVANCE INFORMATION
16
Micronas
4.5. HAL581
The HAL581 is a medium sensitive unipolar switching
sensor with an inverted output (see Fig. 4–5).
The sensor turns to low current consumption with the
magnetic south pole on the branded side of the package
and turns to high current consumption if the magnetic
field is removed. It does not respond to the magnetic
north pole on the branded side.
For correct functioning in the application, the sensor re-
quires only the magnetic south pole on the branded side
of the package.
In this two-wire sensor family, the HAL571 is a sensor
with the same magnetic characteristics but with a normal
output characteristic.
Magnetic Features:
– switching type: unipolar inverted
– medium sensitivity
– typical B
ON
: 10 mT at room temperature
– typical B
OFF
: 12 mT at room temperature
– typical temperature coefficient of magnetic switching
points is 0 ppm/K
– operates with static magnetic fields and dynamic mag-
netic fields up to 10 kHz
Applications
The HAL581 is designed for applications with one mag-
netic polarity and weak magnetic amplitudes at the sen-
sor position where an inverted output signal is required
such as:
– 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.
B
HYS
0
B
OFF
B
ON
B
Fig. 4–5:
Definition of magnetic switching points for
the HAL581
I
DDhigh
I
DDlow
Current consumption
Magnetic Characteristics
at T
J
= –40
°
C to +140
°
C, V
DD
= 3.75 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
On point B
ON
Typ.
Off point B
OFF
Min.
Typ.
Hysteresis B
HYS
Min.
Typ.
Magnetic Offset
Min.
Typ.
Unit
Min.
Max.
Max.
Max.
Max.
–40
°
C
6.5
10
13.8
8
12
15.5
0.5
2
3
11
mT
25
°
C
6.5
10
13.8
8
12
15.5
0.5
2
3
11
mT
100
°
C
6.5
10
13.8
8
12
15.5
0.5
2
3
11
mT
140
°
C
tbd
–
tbd
tbd
–
tbd
tbd
–
tbd
tbd
mT
The hysteresis is the difference between the switching points B
HYS
= B
OFF
– B
ON
The magnetic offset is the mean value of the switching points B
OFFSET
= (B
ON
+ B
OFF
) / 2