HAL54X Datasheet, PDF (19/28 Pages) Micronas – Hall-Effect Sensor Family

DATA SHEET
HAL 542
4. Type Description
4.1. HAL542
The HAL542 is the most sensitive latching sensor of
this family (see Fig. 4–1).
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.
For correct functioning in the application, the sensor
requires both magnetic polarities (north and south) on
the branded side of the package.
Magnetic Features:
– switching type: latching
– high sensitivity
– typical B_ON: 2.6 mT at room temperature
– typical B_OFF: −2.6 mT at room temperature
– operates with static magnetic fields and dynamic
magnetic fields up to 10 kHz
– typical temperature coefficient of magnetic switching
points is −1000 ppm/K
Applications
The HAL542 is the optimal sensor for applications with
alternating magnetic signals and weak magnetic
amplitude at the sensor position such as:
– applications with large air gap or weak magnets,
– rotating speed measurement,
– commutation of brushless DC motors, and
– CAM shaft sensors, and
– magnetic encoders.
Output Voltage
V_O
B_HYS
B_OFF
0
B_ON
V_OL
B
Fig. 4–1: Definition of magnetic switching points for
the HAL542
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.
1
2.8
5
Off point B_OFF
Min. Typ. Max.
−5
−2.8 −1
Hysteresis B_HYS
Min. Typ. Max.
4.5
5.85 7.2
Magnetic Offset
Min. Typ. Max.
0
Unit
mT
25 °C 1
2.6
4.5
−4.5 −2.6 −1
4.5
5.5
6.5
−1.5 0
1.5
mT
100 °C 0.95 2.5
4.4
−4.4 −2.5 −0.95 3.7
5.0
6.3
0
mT
140 °C 0.6
2.4
4.6
−4.6 −2.4 −0.6 3.3
4.8
6.2
0
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
19