HAL573 datasheet(21/36 Pages) MICRONAS

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DATA SHEET

HAL574

Micronas

Dec. 22, 2008; DSH000145_003EN

4.2. HAL574

The HAL574 is a medium sensitive unipolar switching

sensor (see Fig. 4–5).

The sensor turns to high current consumption with the

magnetic south pole on the branded side of the pack-

age and turns to low current consumption if the mag-

netic field is removed. It does not respond to the mag-

netic north pole on the branded side.

For correct functioning in the application, the sensor

requires only the magnetic south pole on the branded

side of the package.

In this two-wire sensor family, the HAL 584 is a sensor

with the same magnetic characteristics but with an

inverted output characteristic.

Magnetic Features:

– switching type: unipolar

– medium sensitivity

–typical BON: 9.2 mT at room temperature

–typical BOFF: 7.2 mT at room temperature

– typical temperature coefficient of magnetic switching

points is 0 ppm/K

– operates with static magnetic fields and dynamic

magnetic fields up to 10 kHz

Applications

The HAL574 is designed for applications with one

magnetic polarity and weak magnetic amplitudes at

the sensor position such as:

– applications with large airgap or weak magnets,

– solid state switches,

– contactless solutions to replace micro switches,

– position and end point detection, and

– rotating speed measurement.

Fig. 4–5: Definition of magnetic switching points for

the HAL574

Magnetic Characteristics at TJ = −40 °C to +140 °C, VDD = 4.3 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.

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

BOFF

BON

IDDhigh

IDDlow

Current consumption

BHYS

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

5.5

9.2

7.2

11.5

0.5

8.2

°C

5.5

9.2

7.2

11.5

0.5

8.2

100

°C

5.5

9.2

7.2

11.5

0.5

8.2

140

°C

8.8

12.5

3.5

7.5

11.5

0.2

1.9

3.5

8.2

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