HAL556
4. Type Description
4.1. HAL556
Applications
The HAL556 is designed for applications with one mag-
netic polarity and weak magnetic amplitudes at the sen-
sor position such as:
The HAL556 is a very sensitive unipolar switching sen-
sor (see Fig. 4–1).
– applications with large airgap or weak magnets,
– solid state switches,
The sensor turns to high current consumption with the
magnetic south pole on the branded side of the package
and turns to low current consumption if the magnetic
field is removed. It does not respond to the magnetic
north pole on the branded side.
– contactless solutions to replace micro switches,
– position and end point detection, and
– rotating speed measurement.
For correct functioning in the application, the sensor re-
quires only the magnetic south pole on the branded side
of the package.
Current consumption
I
DDhigh
In the HAL55x, HAL56x two-wire sensor family, the
HAL566 is a sensor with the same magnetic character-
istics but with an inverted output characteristic.
B
HYS
I
DDlow
Magnetic Features:
– switching type: unipolar
– very high sensitivity
0
B
B
B
OFF
ON
Fig. 4–1: Definition of magnetic switching points for
the HAL556
– typical B : 6 mT at room temperature
ON
– typical B
: 4 mT at room temperature
OFF
– operates with static magnetic fields and dynamic mag-
netic fields up to 10 kHz
Magnetic Characteristics at T = –40 °C to +170 °C, V = 4 V to 24 V,
J
DD
Typical Characteristics for V = 12 V
DD
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.
Off point B
Hysteresis B
HYS
Magnetic Offset
Unit
ON
OFF
T
J
Min.
3.4
3.4
3.2
3
Max.
7.7
7.4
7.2
7.4
7.6
Min.
Typ.
4.2
3.8
3.7
3.6
3.5
Max.
5.9
5.7
5.7
6
Min.
Typ.
2.1
1.8
1.8
1.6
1.5
Max.
Min.
Typ.
5.2
4.9
4.6
4.4
4.2
Max.
–40 °C
6.3
6
2.1
2
0.8
0.5
0.3
0.2
0.2
3
mT
mT
mT
mT
mT
25 °C
100 °C
140 °C
170 °C
2.8
2.8
3
2.7
6.5
5.5
5.2
5
1.9
1.2
1
2.8
6.2
3.2
The hysteresis is the difference between the switching points B
= B – B
ON OFF
HYS
The magnetic offset is the mean value of the switching points B
= (B + B
) / 2
OFF
OFFSET
ON
Changes to the previous edition:
– upper limit for B
at –40 °C, 25 °C, and 100 °C; limits for B
at 25 °C changed
Offset
HYS
– specification for 140 °C and 170 °C added
12
Micronas
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