HAL566 Datasheet, PDF (12/21 Pages) Micronas – Two-Wire Hall Effect Sensor Family

HAL556
4. Type Description
4.1. HAL 556
The HAL 556 is a very sensitive unipolar switching sen-
sor (see Fig. 4–1).
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.
For correct functioning in the application, the sensor re-
quires only the magnetic south pole on the branded side
of the package.
In the HAL 55x, HAL 56x two-wire sensor family, the
HAL566 is a sensor with the same magnetic character-
istics but with an inverted output characteristic.
Magnetic Features:
– switching type: unipolar
– very high sensitivity
– typical B_ON: 6 mT at room temperature
– typical B_OFF: 4 mT at room temperature
– operates with static magnetic fields and dynamic mag-
netic fields up to 10 kHz
Applications
The HAL 556 is designed for applications with one mag-
netic polarity and weak magnetic amplitudes at the sen-
sor position 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.
Current consumption
I_DDhigh
B_HYS
I_DDlow
0
B_OFF
B_ON
B
Fig. 4–1: Definition of magnetic switching points for
the HAL 556
Magnetic Characteristics at T_J = –40 °C to +170 °C, V_DD = 4 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
100 °C
140 °C
170 °C
On point B_ON
Min. Typ. Max.
3.4
6.3
7.7
3.4
6
7.4
3.2
5.5
7.2
3
5.2
7.4
2.8
5
7.6
Off point B_OFF
Min. Typ. Max.
2.1
4.2
5.9
2
3.8
5.7
1.9
3.7
5.7
1.2
3.6
6
1
3.5
6.2
Hysteresis B_HYS
Min. Typ. Max.
0.8
2.1
3
0.5
1.8
2.8
0.3
1.8
2.8
0.2
1.6
3
0.2
1.5
3.2
Magnetic Offset
Unit
Min. Typ. Max.
5.2
mT
2.7
4.9
6.5 mT
4.6
mT
4.4
mT
4.2
mT
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
Changes to the previous edition:
– upper limit for B_HYS at –40 °C, 25 °C, and 100 °C; limits for B_Offset at 25 °C changed
– specification for 140 °C and 170 °C added
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