HAL740
DATA SHEET
4.2. HAL740
Applications
The HAL740 consists of two independent unipolar
switches (see Fig. 4–5) with complementary magnetic
characteristics controlling two independent open-drain
outputs. The Hall plates of the two switches are
spaced 2.35 mm apart.
The HAL740 is the ideal sensor for applications which
require both magnetic polarities, such as:
– position and direction detection, or
– position and end point detection with either mag-
netic pole (omnipolar switch).
The S1-Output turns low with the magnetic north pole
on the branded side of the package and turns high if
the magnetic field is removed. It does not respond to
the magnetic south pole on the branded side.
Output Voltage
VO
The S2-Output turns low with the magnetic south pole
on the branded side of the package and turns high if
the magnetic field is removed. It does not respond to
the magnetic south pole on the branded side.
BHYS
BHYS
VOL
B
BOFF,S1
BOFF,S2 BON,S2
BON,S1
0
Magnetic Features
– two independent Hall-switches
– distance of Hall plates: 2.35 mm
Fig. 4–5: Definition of magnetic switching points for
the HAL740
– temperature coefficient of −2000 ppm/K in all mag-
netic characteristics
– operation with static magnetic fields and dynamic
magnetic fields up to 10 kHz
Magnetic Characteristics
(quasistationary: dB/dT < 0.5 T/ms) at TJ = −40 °C to +100 °C, VDD = 3.8 V to 24 V,
Typical Characteristics for VDD = 12 V. Absolute values common to both Hall switches. The Hall switches S1 and S2
only differ in sign. For S1 the sign is negative, for S2 positive. 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.
8.8
Hysteresis B
HYS
Magnetic Offset
Unit
ON
OFF
T
Min.
−40 °C 8.5
Max.
Min.
5.0
3.5
2.0
1.1
Max.
Min.
Typ.
Max.
Min.
Typ.
10.6
9.8
Max.
J
12.3
16.0
16.0
16.0
16.0
12.5
12.5
12.5
12.5
2.0
2.0
1.5
1.0
−
−
−
−
5.5
6.0
6.5
7.0
−
−
−
−
−
−
−
−
mT
mT
mT
mT
25 °C 7.0
100 °C 5.5
140 °C 4.6
11.5
8.0
10.8
7.0
8.9
10.4
6.8
8.6
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
18
Nov. 30, 2009; DSH000029_002EN
Micronas
MICRONAS [ MICRONAS ]
