HAL115
4.2. HAL115
Applications
TheHAL115isabipolarswitchingsensor(seeFig. 4–5).
The HAL115 is the optimal sensor for all applications
with alternating magnetic signals 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 with the
magnetic north pole on the branded side. The output
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.
– rotating speed measurement,
– commutation of brushless DC-motors and cooling
fans.
For correct functioning in the application, the sensor re-
quires both magnetic polarities (north and south) on the
branded side of the package.
Output Voltage
V
O
B
HYS
Magnetic Features:
– switching type: bipolar
– high sensitivity
V
OL
– typical B : 1.2 mT at room temperature
ON
B
OFF
0
B
ON
B
– typical B
: –1.2 mT at room temperature
OFF
Fig. 4–5:Definitionofmagneticswitchingpointsforthe
HAL115
– operates with static magnetic fields and dynamic mag-
netic fields up to 20 kHz
Magnetic Characteristics at T = –40 °C to +140 °C, V = 4.5 V to 24 V,
J
DD
Typical Characteristics for V = 12 V
DD
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.
Off point B
Typ.
Hysteresis B
Typ.
Unit
ON
OFF
HYS
T
J
Min.
Max.
12.5
12.5
12.5
12.5
Min.
Max.
10.7
10.7
10.7
10.7
Min.
1.8
1.8
1.5
1
Max.
–40 °C
–10.7
–10.7
–10.7
–10.7
1.4
1.2
1
–12.5
–12.5
–12.5
–12.5
–1.4
–1.2
–1
2.8
2.4
2
7
7
7
7
mT
mT
mT
mT
25 °C
100 °C
140 °C
0.9
–0.9
1.8
The hysteresis is the difference between the switching points B
= B – B
ON OFF
HYS
The magnetic limits given above refer to parts in the original packaging. Mechanical stress on the hall sensitive areas
on the chip surface may generate an additional magnetic offset, which can slightly change the magnetic switching
points. Thisbehaviorisaphysicalphenomenonandnotamalfunctionofthesensor. Mechanicalstressonthehallplates
can be caused, for example, by overmoulding the plastic package or by wide range temperature changes like soldering
or operating the parts at extreme temperatures.
Please use a sensor of the HAL5xx family if higher robustness against mechanical stress is required.
12
Micronas
MICRONAS [ MICRONAS ]
