ATS635LSE and ATS636LSE

PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

Copyright © 2005 Allegro MicroSystems, Inc.

MAGNETIC CHARACTERISTICS over operating voltage and junction temperature range using

reference target (Unless otherwise noted)

Limits

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Switch Point

–

7

–

Bit

Switch Point Polarity

–

1

–

Bit

Number of Programming

Bits

-

Programming Lock

–

1

–

Bit

Gear Tooth Sensor / Proximity Sensing Characteristics (Low Switchpoint Only)

Temp: 25°C Code –127

2.5

–

–

mm

Range

Temp: 25°C Code +127

–

–

1.5

mm

Programming Resolution

Temperature: 25°C

Program Air Gap = 2.5 mm

–

0.05

–

mm

Temperature Range

Device Programmed

to 2.5 mm

–

0.2

–

mm

–

HIGH

–

–

–

LOW

–

–

–

LOW

–

–

Polarity

P

–

HIGH

–

–

temperature. Programming at larger air gaps leaves no safety margin for switchpoint drift. See the applications note: “Proximity Sensing

for additional information.

a tested parameter in production. Switch point air gap generally drifts downward as temperature increases.

Tooth and Valley Field vs. Air Gap

Reference Target

0

200

400

600

800

1000

1200

1400

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

Air Gap [mm]

Reference Target Tooth

Reference Target Valley

Reference Target Tooth and Valley Field vs. Air Gap

Reference Target Flux Density vs. Position

0

200

400

600

800

1000

1200

1400

0

30

60

90 120 150 180 210 240 270 300 330 360

Position (º)

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

3.25

3.50

3.75

4.00

4.25

4.50

4.75

5.00

5.25

5.50

5.75

6.00

Reference Target Flux Density vs. Position: Typical