DATA SHEET
HAL542
4. Type Description
4.1. HAL542
Applications
The HAL542 is the optimal sensor for applications with
alternating magnetic signals and weak magnetic
amplitude at the sensor position such as:
The HAL542 is the most sensitive latching sensor of
this family (see Fig. 4–1).
– applications with large air gap or weak magnets,
– rotating speed measurement,
The output turns low with the magnetic south pole on
the branded side of the package and turns high with
the magnetic north pole on the branded side. The out-
put does not change if the magnetic field is removed.
For changing the output state, the opposite magnetic
field polarity must be applied.
– commutation of brushless DC motors, and
– CAM shaft sensors, and
– magnetic encoders.
For correct functioning in the application, the sensor
requires both magnetic polarities (north and south) on
the branded side of the package.
Output Voltage
VO
BHYS
Magnetic Features:
– switching type: latching
VOL
– high sensitivity
B
BOFF
0
BON
– typical BON: 2.6 mT at room temperature
– typical BOFF: −2.6 mT at room temperature
Fig. 4–1: Definition of magnetic switching points for
the HAL542
– operates with static magnetic fields and dynamic
magnetic fields up to 10 kHz
– typical temperature coefficient of magnetic switching
points is −1000 ppm/K
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
Typ.
2.8
Off point B
Typ.
Hysteresis B
HYS
Magnetic Offset
Unit
ON
OFF
T
Min.
1
Max.
5
Min.
−5
Max.
Min.
Typ.
5.85
5.5
Max.
Min.
Typ.
Max.
J
−40 °C
25 °C
−2.8
−1
4.5
4.5
3.7
3.3
7.2
6.5
6.3
6.2
0
0
0
0
mT
mT
mT
mT
1
2.6
4.5
4.4
4.6
−4.5
−4.4
−4.6
−2.6
−1
−1.5
1.5
100 °C
140 °C
0.95
0.6
2.5
−2.5
−0.95
−0.6
5.0
2.4
−2.4
4.8
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
19
MICRONAS [ MICRONAS ]
