HAL501K datasheet(26/44 Pages) ETC

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HAL508

Micronas

4.7. HAL 508

The HAL 508 is a unipolar switching sensor (see

Fig. 4–25).

The output turns low with the magnetic south pole on the

branded side of the package and turns high if the mag-

netic field is removed. The sensor does not respond to

the magnetic north pole on the branded side.

For correct functioning in the application, the sensor re-

quires only the magnetic south pole on the branded side

of the package.

In the HAL 5xx family, the HAL 518 is a sensor with the

same magnetic characteristics but with an inverted out-

put characteristic.

Magnetic Features:

– switching type: unipolar

– medium sensitivity

– typical BON: 18 mT at room temperature

– typical BOFF: 16 mT at room temperature

– operates with static magnetic fields and dynamic mag-

netic fields up to 10 kHz

– typical temperature coefficient of magnetic switching

points is –1000 ppm/K

Applications

The HAL 508 is the optimal sensor for applications with

one magnetic polarity such as:

– solid state switches,

– contactless solution to replace micro switches,

– position and end point detection, and

– rotating speed measurement.

BHYS

Output Voltage

0BOFF

BON

VOL

Fig. 4–25: Definition of magnetic switching points for

the HAL 508

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 BON

Off point BOFF

Hysteresis BHYS

Magnetic Offset

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

–40

°C

15.5

21.9

16.7

1.6

2.3

2.8

17.8

°C

20.7

13.5

1.5

2.7

100

°C

13.9

16.6

20.4

12.5

14.8

18.7

1.2

1.8

2.6

15.7

140

°C

13.2

15.8

20.2

11.9

14.1

18.5

1.1

1.7

2.6

170

°C

12.7

15.3

11.4

13.6

18.3

1.7

2.6

14.4

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

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