HAL501 datasheet(22/48 Pages) MICRONAS

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HAL 501

DATA SHEET

April 15. 2010; DSH000020_004EN

Micronas

4. Type Description

4.1. HAL 501

The HAL 501 is the most sensitive sensor of this family

with bipolar switching behavior (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 state is not defined for all sensors if the magnetic

field is removed again. Some sensors will change the

output state and some sensors will not.

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: bipolar

– very high sensitivity

–typical BON: 0.5 mT at room temperature

–typical BOFF: −0.7 mT at room temperature

– operates with static magnetic fields and dynamic

magnetic fields up to 10 kHz

Applications

The HAL 501 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.

Fig. 4–1: Definition of magnetic switching points for

HAL 501

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.

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

VOL

Output Voltage

BHYS

Parameter

On point BON

Off point BOFF

Hysteresis BHYS

Magnetic Offset BOFFSET

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

Min.

Typ.

Max.

−40 °C

−0.8

0.6

2.5

−2.5

−0.8

0.8

0.5

1.4

−0.1

°C

−0.5

0.5

2.3

−2.3

−0.7

0.5

1.2

1.9

−1.4

−0.1

1.4

140

°C

−1.2

0.6

2.8

−2.5

−0.5

1.3

0.5

1.1

1.8

170

°C

−1.5

0.7

−2.5

−0.2

0.4

0.9

1.8

0.2

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