DATA SHEET
HAL548
Applications
The HAL548 is the ideal sensor for all applications
with one magnetic polarity and weak magnetic ampli-
tude at the sensor position such as:
– solid state switches,
– contactless solution to replace micro switches,
– position and end point detection, and
– rotating speed measurement.
4.4. HAL548
The HAL548 is a unipolar switching sensor (see
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.
Magnetic Features:
– switching type: unipolar,
– medium sensitivity
– typical B
ON
: 18 mT at room temperature
– typical B
OFF
: 12 mT at room temperature
– operates with static magnetic fields and dynamic
magnetic fields up to 10 kHz
0
B
OFF
B
ON
V
OL
B
Output Voltage
V
O
B
HYS
Fig. 4–10:
Definition of magnetic switching points for
the HAL548
Magnetic Characteristics
at T
J
=
−40 °C
to +140
°C,
V
DD
= 4.3 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
Min.
12
12
12
12
On point B
ON
Typ.
19
18
18
17
Max.
24
24
24
24
Off point B
OFF
Min.
6
6
6
6
Typ.
13
12
12
11
Max.
18
18
18
18
Hysteresis B
HYS
Min.
4
4
4
4
Typ.
6
6
6
6
Max.
8
8
8
8
Magnetic Offset
Min.
−
9
−
−
Typ.
16
15
15
14
Max.
−
21
−
−
mT
mT
mT
mT
Unit
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
Micronas
Feb. 12, 2009; DSH000023_003EN
25
MICRONAS [ MICRONAS ]
