HAL501 datasheet(16/44 Pages) ETC

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HAL502

Micronas

4.2. HAL 502

The HAL 502 is the most sensitive latching sensor of this

family (see Fig. 4–5).

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

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 re-

quires both magnetic polarities (north and south) on the

branded side of the package.

Magnetic Features:

– switching type: latching

– high sensitivity

– typical BON: 2.6 mT at room temperature

– typical BOFF: –2.6 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 502 is the optimal sensor for all applications

with alternating magnetic signals and weak magnetic

amplitude at the sensor position such as:

– applications with large airgap or weak magnets,

– rotating speed measurement,

– commutation of brushless DC motors,

– CAM shaft sensors, and

– magnetic encoders.

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

the HAL 502

BHYS

Output Voltage

BOFF

BON

VOL

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

2.8

–5

–2.8

–1

4.5

5.6

7.2

°C

2.6

4.5

–4.5

–2.6

–1

4.5

5.2

–1.5

1.5

100

°C

0.95

2.5

4.4

–4.4

–2.5

–0.95

6.8

140

°C

0.9

2.4

4.3

–4.3

–2.4

–0.9

3.7

4.8

6.8

170

°C

0.9

2.3

4.3

–4.3

–2.3

–0.9

3.5

4.6

6.8

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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