HAL 501
DATA SHEET
4. Type Description
4.1. HAL 501
Applications
The HAL 501 is the optimal sensor for applications
with alternating magnetic signals and weak magnetic
amplitude at the sensor position such as:
The HAL 501 is the most sensitive sensor of this family
with bipolar switching behavior (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 state is not defined for all sensors if the magnetic
field is removed again. Some sensors will change the
output state and some sensors will not.
– 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: bipolar
VOL
– very high sensitivity
BOFF
0
BON
B
– typical BON: 0.5 mT at room temperature
– typical BOFF: −0.7 mT at room temperature
Fig. 4–1: Definition of magnetic switching points for
HAL 501
– operates with static magnetic fields and dynamic
magnetic fields up to 10 kHz
Magnetic Characteristics at TJ = −40 °C to +170 °C, VDD = 3.8 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.
0.6
Off point B
Typ.
Hysteresis B
Magnetic Offset B
Unit
ON
OFF
HYS
OFFSET
T
Min.
−0.8
−0.5
−1.2
−1.5
Max.
2.5
2.3
2.8
3
Min.
−2.5
−2.3
−2.5
−2.5
Max.
Min.
Typ.
1.4
1.2
1.1
0.9
Max.
Min.
Typ.
−0.1
−0.1
0
Max.
J
−40 °C
25 °C
−0.8
0.8
0.5
1.3
2
0.5
0.5
0.5
0.4
2
mT
mT
mT
mT
0.5
−0.7
1.9
1.8
1.8
−1.4
1.4
140 °C
170 °C
0.6
−0.5
0.7
−0.2
0.2
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
22
Jan. 11. 2010; DSH000020_004EN
Micronas
MICRONAS [ MICRONAS ]
