HAL54X Datasheet, PDF (25/28 Pages) Micronas – Hall-Effect Sensor Family

DATA SHEET
HAL 548
4.4. HAL548
The HAL548 is a unipolar switching sensor (see
Fig. 4–10).
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
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.
Output Voltage
V_O
B_HYS
V_OL
0
B_OFF
B_ON
B
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
On point B_ON
Min. Typ. Max.
12
19
24
Off point B_OFF
Min. Typ. Max.
6
13
18
Hysteresis B_HYS
Min. Typ. Max.
4
6
8
Magnetic Offset
Min. Typ. Max.
−
16
−
Unit
mT
25 °C 12
18
24
6
12
18
4
6
8
9
15
21
mT
100 °C 12
18
24
6
12
18
4
6
8
−
15
−
mT
140 °C 12
17
24
6
11
18
4
6
8
−
14
−
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
Micronas
Feb. 12, 2009; DSH000023_003EN
25