DATA SHEET
HAL548
4.4. HAL548
Applications
The HAL548 is a unipolar switching sensor (see
Fig. 4–10).
The HAL548 is the ideal sensor for all applications
with one magnetic polarity and weak magnetic ampli-
tude at the sensor position such as:
The output turns low with the magnetic south pole on
the branded side of the package and turns high if the
magnetic field is removed. The sensor does not
respond to the magnetic north pole on the branded
side.
– solid state switches,
– contactless solution to replace micro switches,
– position and end point detection, and
– rotating speed measurement.
Magnetic Features:
Output Voltage
VO
– switching type: unipolar,
– medium sensitivity
BHYS
– typical BON: 18 mT at room temperature
– typical BOFF: 12 mT at room temperature
– operates with static magnetic fields and dynamic
magnetic fields up to 10 kHz
VOL
0
BOFF
BON
B
Fig. 4–10: Definition of magnetic switching points for
the HAL548
Magnetic Characteristics at TJ = −40 °C to +140 °C, VDD = 4.3 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.
12
Typ.
19
Max.
24
Min.
Typ.
13
Max.
Min.
Typ.
Max.
Min.
Typ.
16
Max.
J
−40 °C
25 °C
6
6
6
6
18
18
18
18
4
4
4
4
6
6
6
6
8
8
8
8
−
9
−
−
−
mT
mT
mT
mT
12
18
24
12
15
21
−
100 °C
140 °C
12
18
24
12
15
12
17
24
11
14
−
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
Feb. 12, 2009; DSH000023_003EN
25
MICRONAS [ MICRONAS ]
