HAL556_1 Datasheet, PDF (18/26 Pages) Micronas – Two-Wire Hall-Effect Sensor Family

HAL55x, HAL56x
DATA SHEET
4. Type Description
4.1. HAL556
The HAL556 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 pack-
age and turns to low current consumption if the mag-
netic field is removed. It does not respond to the mag-
netic north pole on the branded side.
For correct functioning in the application, the sensor
requires only the magnetic south pole on the branded
side of the package.
In the HAL55x, HAL56x two-wire sensor family, the
HAL566 is a sensor with the same magnetic charac-
teristics 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
magnetic fields up to 10 kHz
Applications
The HAL556 is designed for applications with one
magnetic polarity and weak magnetic amplitudes at
the sensor 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
B_HYS
I_DDhigh
I_DDlow
0
B_OFF
B_ON
B
Fig. 4–1: Definition of magnetic switching points for
the HAL556
Magnetic Characteristics at T_J = −40 °C to +140 °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
On point B_ON
Min. Typ. Max.
3.4
6.3
7.7
Off point B_OFF
Min. Typ. Max.
2.1
4.2
5.9
Hysteresis B_HYS
Min. Typ. Max.
0.8
2.1
3
Magnetic Offset
Min. Typ. Max.
5.2
Unit
mT
25 °C 3.4
6
7.4
2
3.8
5.7
0.5
1.8
2.8
2.7
4.9
6.5
mT
100 °C 3.2
5.5
7.2
1.9
3.7
5.7
0.3
1.8
2.8
4.6
mT
140 °C 3
5.2
7.4
1.2
3.6
6
0.2
1.6
3
4.4
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
18
Aug. 11, 2009; DSH000026_004EN
Micronas